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Texas A&M University
1.
Ponnalagu, Alagappan.
Dynamic Response of Viscoelastic Solids Described by Implicit Constitutive Theories.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155588 
► The aim of this work is to study the impact response of multilayered polymers using a thermodynamically consistent framework. Rather than integral type viscoelastic model,…
(more)
▼ The aim of this work is to study the impact response of multilayered polymers using a thermodynamically consistent framework. Rather than integral type viscoelastic model, the approach here is based on the idea of two inter penetrating networks, one is permanent and other is transient together with the rate equations for the time evolution of the transient network. The primary hypothesis is that, it is possible to use a two network theory to capture the essential features of a impact response of multilayered polymers and solve the resulting boundary value problem using
finite volume scheme.
We first study the impact of layered polymer plate involving small deformation using a thermodynamic framework. The constitutive equations are nonlinear even though the strains are small. Six different protocols involving PU and PC, namely pure PC, pure PU, bilayer(PU/PC and PC/PU) and trilayer(PU/PC/PU and PC/PU/PC) were considered to evaluate the performance of the layering sequence based on the kinetic energy transferred on the wall. The interfaces are assumed to be fully bonded. The material parameters for the model was obtained from the experimental creep data from the literature. The layering of polymers improved the performance of plate depending upon the type of layering sequence. In the one and two dimensional study carried out, the performance was best when a compliant layer is placed between two stiff layers. Whereas, when a stiff layer was placed between two less compliant layer, the performance was worse than bilayer. Finally, a thermodynamically consistent
finite deformation model was used to evaluate the impact performance of layered plate involving large deformation. A full scale three dimensional impact analysis was carried out with the thermal phenomena suppressed. Similar to the small deformation study, six different protocols were considered. The material parameters were obtained from the experimental data from the literature involving strain values above 50%. The overall performance was similar to what has been observed in the small strain model.
Advisors/Committee Members: Rajagopal, Kumbakonam R (advisor), Srinivasa, Arun R (advisor), Walton, Jay R (committee member), Muliana, Anastasia H (committee member).
Subjects/Keywords: Implicit; Finite Volume method
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APA (6th Edition):
Ponnalagu, A. (2015). Dynamic Response of Viscoelastic Solids Described by Implicit Constitutive Theories. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155588
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Ponnalagu, Alagappan. “Dynamic Response of Viscoelastic Solids Described by Implicit Constitutive Theories.” 2015. Thesis, Texas A&M University. Accessed November 17, 2019.
http://hdl.handle.net/1969.1/155588.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Ponnalagu, Alagappan. “Dynamic Response of Viscoelastic Solids Described by Implicit Constitutive Theories.” 2015. Web. 17 Nov 2019.
Vancouver:
Ponnalagu A. Dynamic Response of Viscoelastic Solids Described by Implicit Constitutive Theories. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/1969.1/155588.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Ponnalagu A. Dynamic Response of Viscoelastic Solids Described by Implicit Constitutive Theories. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155588
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
2.
Van der Plas, P.
A momentum conservative finite-volume scheme on a staggered z-layer grid for three-dimensional non-hydrostatic flow
:.
Degree: 2010, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:b18ebac9-f899-455d-a198-89dc8cbe1c91
► In the early 90’ the research institute Deltares began the development of a non-hydrostatic extension for the existing three-dimensional shallow-water simulation software Delft3D-FLOW a modeling…
(more)
▼ In the early 90’ the research institute Deltares began the development of a non-hydrostatic extension for the existing three-dimensional shallow-water simulation software Delft3D-FLOW a modeling package which was originally intended for hydrostatic shallow-water flow.
The original non-hydrostatic flow model is based on a non-conservative
finite-difference discretization of the momentum equations. A model study demonstrated improved performance of conservative discretization schemes over non-conservative scheme for strongly varying and
convection-dominated flow. For non-hydrostatic flow a momentum conservative
finite-
volume discretization is more appropriate. A three-dimensional
finite-
volume scheme on staggered z-layer grids is presented with improved momentum conservation properties.
For simulations of dynamic flow the conservation properties in time of the numerical scheme become more important. Since many typical non-hydrostatic flow situations do not concern steady state calculations, also attention is paid to the momentum conservation properties of the model in time.
For strongly non-hydrostatic flow simulations the treatment of the bottom and free-surface
becomes of large importance. The design of the
finite-
volume discretization gave the opportunity to have a renewed look on of the existing Delft3D z-layer model.
Simulations have been carried out of short waves in a basin. The results showed an improvement compared with the existing
finite-difference method and brought to the attention other aspects of the existing discretization that demand improvement in order to make the model suitable for strongly non-hydrostatic, convection-dominated flow.
Advisors/Committee Members: Wilders, P., Heemink, A.W..
Subjects/Keywords: cfd; convection; finite volume
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APA (6th Edition):
Van der Plas, P. (2010). A momentum conservative finite-volume scheme on a staggered z-layer grid for three-dimensional non-hydrostatic flow
:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:b18ebac9-f899-455d-a198-89dc8cbe1c91
Chicago Manual of Style (16th Edition):
Van der Plas, P. “A momentum conservative finite-volume scheme on a staggered z-layer grid for three-dimensional non-hydrostatic flow
:.” 2010. Masters Thesis, Delft University of Technology. Accessed November 17, 2019.
http://resolver.tudelft.nl/uuid:b18ebac9-f899-455d-a198-89dc8cbe1c91.
MLA Handbook (7th Edition):
Van der Plas, P. “A momentum conservative finite-volume scheme on a staggered z-layer grid for three-dimensional non-hydrostatic flow
:.” 2010. Web. 17 Nov 2019.
Vancouver:
Van der Plas P. A momentum conservative finite-volume scheme on a staggered z-layer grid for three-dimensional non-hydrostatic flow
:. [Internet] [Masters thesis]. Delft University of Technology; 2010. [cited 2019 Nov 17].
Available from: http://resolver.tudelft.nl/uuid:b18ebac9-f899-455d-a198-89dc8cbe1c91.
Council of Science Editors:
Van der Plas P. A momentum conservative finite-volume scheme on a staggered z-layer grid for three-dimensional non-hydrostatic flow
:. [Masters Thesis]. Delft University of Technology; 2010. Available from: http://resolver.tudelft.nl/uuid:b18ebac9-f899-455d-a198-89dc8cbe1c91
Anna University
3.
Sundararaj, K.
Numerical investigation on Staged transverse injection in
a Scramjet combustor and its mixing Augmentation using expansion
ramp; -.
Degree: Mechanical Engineering, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/27238
► This work involves an application of the computational fluid newlinedynamics to a problem associated with the flow inside the supersonic newlinecombustor region of a scramjet…
(more)
▼ This work involves an application of the
computational fluid newlinedynamics to a problem associated with
the flow inside the supersonic newlinecombustor region of a
scramjet engine An existing supersonic combustor newlinemodel
canonical model consisting of the staged transverse injection
behind a newlinerearward facing step was simulated for various flow
conditions to investigate newlinethe flow in detail A method for
augmenting the mixing of air and the fuel in newlinethe canonical
model was suggested by introducing the expansion ramps on
newlineboth the sides of the injectors and its effectiveness was
tested by numerical newlinemethods The intent was to promote
streamwise vorticity by modifying newlinegeometry to improve the
mixing characteristics in the combustor newlineThe combustor models
were simulated using the finite volume newlinebased code FLUENT and
the governing equations were solved by means of a newlinecoupled
explicit method using shear stress transport SST K turbulence
newlinemodel newline
reference p.154-159
Advisors/Committee Members: Dhandapani, S.
Subjects/Keywords: Finite volume based code; Shear stress transport
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APA (6th Edition):
Sundararaj, K. (2014). Numerical investigation on Staged transverse injection in
a Scramjet combustor and its mixing Augmentation using expansion
ramp; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/27238
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sundararaj, K. “Numerical investigation on Staged transverse injection in
a Scramjet combustor and its mixing Augmentation using expansion
ramp; -.” 2014. Thesis, Anna University. Accessed November 17, 2019.
http://shodhganga.inflibnet.ac.in/handle/10603/27238.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sundararaj, K. “Numerical investigation on Staged transverse injection in
a Scramjet combustor and its mixing Augmentation using expansion
ramp; -.” 2014. Web. 17 Nov 2019.
Vancouver:
Sundararaj K. Numerical investigation on Staged transverse injection in
a Scramjet combustor and its mixing Augmentation using expansion
ramp; -. [Internet] [Thesis]. Anna University; 2014. [cited 2019 Nov 17].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27238.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sundararaj K. Numerical investigation on Staged transverse injection in
a Scramjet combustor and its mixing Augmentation using expansion
ramp; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27238
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Wright State University
4.
Gross, Paul A., II.
Commercial Program Development for a Ground Loop Geothermal
System: Energy Loads, GUI, Turbulent Flow, Heat Pump Model and Grid
Study.
Degree: MSEgr, Renewable and Clean Energy, 2011, Wright State University
URL: http://rave.ohiolink.edu/etdc/view?acc_num=wright1324258915
► The use of the earth's thermal energy to heat and cool building space is nothing new; however, the heat transfer approximations used in modeling geothermal…
(more)
▼ The use of the earth's thermal energy to heat and cool
building space is nothing new; however, the heat transfer
approximations used in modeling geothermal systems, leave
uncertainty and lead to over sizing. The present work is part of a
Wright State effort to improve the computer modeling tools used to
simulate ground loop geothermal heating and cooling systems. The
modern computer processor has equipped us with the computation
speed to use a
finite volume technique to solve the unsteady heat
equation with hourly time steps for multi-year analyses in multiple
spatial dimensions. Thus we feel there is more need to use
approximate heat transfer solution techniques to model geothermal
heating and cooling systems.As part of a DOE funded project Wright
State has been developing a ground loop geothermal computer
modeling tool that uses a detailed heat transfer model based on the
governing differential energy equation. This tool is meant to be
more physically detailed and accurate than current commercial
ground loop geothermal computer codes. The Wright State code allows
the geothermal designer to optimize the system using a number of
outputs including temperature field outputs, existing fluid
temperature plots, heat exchange plots, and even a histogram of the
COP data. Careful attention to the algorithm speed allows for
multi-year simulations with minimal computation cost. Once the
thermal and heat transfer computations are complete, a payback
period calculator can compare any conventional heating and cooling
system to the designed geothermal system and payback periods are
displayed.The work being presented as part of this thesis deals
with five issues that were required to make the Wright State
geothermal computer code a reality. The five aspects of this
modeling tool addressed by this thesis work are: energy load
calculations, GUI (graphical user interface) development,
turbulence model development, heat pump model development, and
two-dimensional numerical grid development. The energy load, or
heating and cooling load, calculations are handled using the
sophisticated DOE program called EnergyPlus. This thesis work
developed a technique for coupling EnergyPlus to the Wright State
geothermal code and devising a way for novice users to obtain
energy loads quickly and easily, while still allowing expert users
to utilize the full strength of EnergyPlus. The GUI for the Wright
State computer program was developed with the novice and expert
users in mind. The GUI offers ease of use while maintaining the
ability for the expert users to setup unique designs for
simulation. A unique way of modeling the effects of turbulent flow
in the ground tube has allowed the Wright State code to maintain
low computation times, while having small errors for a wide range
of Reynolds numbers. To make the Wright State ground loop computer
model more complete, a heat pump was developed as part of this
work. The heat pump model uses the performance characteristics of
commercial heat pumps to determine the performance of the
geothermal system. The…
Advisors/Committee Members: Menart, James (Committee Chair).
Subjects/Keywords: Mechanical Engineering; geothermal; numerical; EnergyPlus; finite volume
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APA (6th Edition):
Gross, Paul A., I. (2011). Commercial Program Development for a Ground Loop Geothermal
System: Energy Loads, GUI, Turbulent Flow, Heat Pump Model and Grid
Study. (Masters Thesis). Wright State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=wright1324258915
Chicago Manual of Style (16th Edition):
Gross, Paul A., II. “Commercial Program Development for a Ground Loop Geothermal
System: Energy Loads, GUI, Turbulent Flow, Heat Pump Model and Grid
Study.” 2011. Masters Thesis, Wright State University. Accessed November 17, 2019.
http://rave.ohiolink.edu/etdc/view?acc_num=wright1324258915.
MLA Handbook (7th Edition):
Gross, Paul A., II. “Commercial Program Development for a Ground Loop Geothermal
System: Energy Loads, GUI, Turbulent Flow, Heat Pump Model and Grid
Study.” 2011. Web. 17 Nov 2019.
Vancouver:
Gross, Paul A. I. Commercial Program Development for a Ground Loop Geothermal
System: Energy Loads, GUI, Turbulent Flow, Heat Pump Model and Grid
Study. [Internet] [Masters thesis]. Wright State University; 2011. [cited 2019 Nov 17].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1324258915.
Council of Science Editors:
Gross, Paul A. I. Commercial Program Development for a Ground Loop Geothermal
System: Energy Loads, GUI, Turbulent Flow, Heat Pump Model and Grid
Study. [Masters Thesis]. Wright State University; 2011. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=wright1324258915
Penn State University
5.
Singh, Gurpreet.
FINITE-VOLUME ANALYSIS OF TWO-PHASE SPLIT AT
T-JUNCTIONS.
Degree: MS, Petroleum and Mineral Engineering, 2008, Penn State University
URL: https://etda.libraries.psu.edu/catalog/9091
► A two-fluid finite-volume model for predicting liquid route selection for two-phase gas-liquid flow at diverging T-junctions is presented. Stratified smooth, wavy stratified and mist flow…
(more)
▼ A two-fluid finite-volume model for predicting liquid
route selection for two-phase gas-liquid flow at diverging
T-junctions is presented. Stratified smooth, wavy stratified and
mist flow patterns for low liquid loading systems were
investigated. A steady state mass and momentum conservation with
appropriate closure correlations applied to finite volume
discretized tee is used to simulate pressure, velocity and liquid
holdup conditions at and in near proximity of T-junctions. A
simultaneous solution approach (Generalized Newton Raphson) was
used to solve model governing equations. Previous models rely upon
specification of branch gas mass fraction, information which is not
readily available for large pipeline networks. Additionally, a
pressure difference between run and branch arms was considered as a
derivative for two phase split undermining the significance of
absolute pressures. The proposed model formulation is capable of
handling available field data to affect two phase flow split at a
Tee. Pressure, liquid holdup and phase velocity profiles
predictions can be generated instead of a single-point split at
T-junctions, as suggested in earlier studies. A simultaneous solver
employed allows study of interconnectivity between system elements
and renders the model an inherent dependency on existing flow
parameters. Several parametric studies and comparisons are
presented to demonstrate model capabilities.
Subjects/Keywords: two-phase; T-junctions; finite volume
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APA (6th Edition):
Singh, G. (2008). FINITE-VOLUME ANALYSIS OF TWO-PHASE SPLIT AT
T-JUNCTIONS. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/9091
Chicago Manual of Style (16th Edition):
Singh, Gurpreet. “FINITE-VOLUME ANALYSIS OF TWO-PHASE SPLIT AT
T-JUNCTIONS.” 2008. Masters Thesis, Penn State University. Accessed November 17, 2019.
https://etda.libraries.psu.edu/catalog/9091.
MLA Handbook (7th Edition):
Singh, Gurpreet. “FINITE-VOLUME ANALYSIS OF TWO-PHASE SPLIT AT
T-JUNCTIONS.” 2008. Web. 17 Nov 2019.
Vancouver:
Singh G. FINITE-VOLUME ANALYSIS OF TWO-PHASE SPLIT AT
T-JUNCTIONS. [Internet] [Masters thesis]. Penn State University; 2008. [cited 2019 Nov 17].
Available from: https://etda.libraries.psu.edu/catalog/9091.
Council of Science Editors:
Singh G. FINITE-VOLUME ANALYSIS OF TWO-PHASE SPLIT AT
T-JUNCTIONS. [Masters Thesis]. Penn State University; 2008. Available from: https://etda.libraries.psu.edu/catalog/9091
Delft University of Technology
6.
Molenaar, S.
Dynamic modeling of adipic acid crystallization:.
Degree: 2011, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:270ea312-4b37-4c00-84f1-ac637cdfc9d0
A model was developed including nucleation, growth and agglomeration. The population balance was solved using a high order finite volume method.
Advisors/Committee Members: Kramer, H.J.M., Mesbah, A..Subjects/Keywords: crystallization; finite volume; pbe; adipicacid; modeling
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APA (6th Edition):
Molenaar, S. (2011). Dynamic modeling of adipic acid crystallization:. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:270ea312-4b37-4c00-84f1-ac637cdfc9d0
Chicago Manual of Style (16th Edition):
Molenaar, S. “Dynamic modeling of adipic acid crystallization:.” 2011. Masters Thesis, Delft University of Technology. Accessed November 17, 2019.
http://resolver.tudelft.nl/uuid:270ea312-4b37-4c00-84f1-ac637cdfc9d0.
MLA Handbook (7th Edition):
Molenaar, S. “Dynamic modeling of adipic acid crystallization:.” 2011. Web. 17 Nov 2019.
Vancouver:
Molenaar S. Dynamic modeling of adipic acid crystallization:. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2019 Nov 17].
Available from: http://resolver.tudelft.nl/uuid:270ea312-4b37-4c00-84f1-ac637cdfc9d0.
Council of Science Editors:
Molenaar S. Dynamic modeling of adipic acid crystallization:. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:270ea312-4b37-4c00-84f1-ac637cdfc9d0
King Abdullah University of Science and Technology
7.
Mantravadi, Bhargav.
Numerical study of linear and nonlinear problems using two-fluid plasma model in one dimension.
Degree: 2019, King Abdullah University of Science and Technology
URL: http://hdl.handle.net/10754/644887
► The ideal two-fluid plasma model is a more generalized plasma model compared to the ideal MHD and it couples the ion and electron Euler equations…
(more)
▼ The ideal two-fluid plasma model is a more generalized plasma model compared to the ideal MHD and it couples the ion and electron Euler equations via Maxwell's equations. Two-fluid plasma model is essential when the ion and electron fluids are at different temperatures. In this work, a fundamental investigation on the effect of non-dimensional light speed, ion-to-electron mass ratio and plasma beta on the plasma dynamics in the Brio-Wu shock tube Riemann problem is presented. A one dimensional finite volume code is developed based on the macroscopic governing equations, with second order accuracy in space and time. The source terms are treated implicitly and the homogeneous flux terms are treated explicitly. The credibility of the numerical results is assessed by performing several linear and nonlinear tests.
Realistic light speed results in increasing the stiffness of the equations and severe time step restriction, which poses a challenge to the numerical simulations. In the context of the Brio-Wu shock tube problem, it is observed that the light speed is not important with respect to the hydrodynamics. However, light speed does affect the magnitude of the self generated electric field. Mass ratio affects the electron plasma dynamics. The speed of the fast moving electron plasma waves changes with the mass ratio. The results obtained using a mass ratio of 500 are in close agreement with that of realistic mass ratio of 1836. Increasing plasma beta suppresses the amplitude of the fast moving electron plasma waves.
Subjects/Keywords: two-fluid plasma; MHD; Finite Volume Method
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APA (6th Edition):
Mantravadi, B. (2019). Numerical study of linear and nonlinear problems using two-fluid plasma model in one dimension. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/644887
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mantravadi, Bhargav. “Numerical study of linear and nonlinear problems using two-fluid plasma model in one dimension.” 2019. Thesis, King Abdullah University of Science and Technology. Accessed November 17, 2019.
http://hdl.handle.net/10754/644887.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mantravadi, Bhargav. “Numerical study of linear and nonlinear problems using two-fluid plasma model in one dimension.” 2019. Web. 17 Nov 2019.
Vancouver:
Mantravadi B. Numerical study of linear and nonlinear problems using two-fluid plasma model in one dimension. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2019. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10754/644887.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mantravadi B. Numerical study of linear and nonlinear problems using two-fluid plasma model in one dimension. [Thesis]. King Abdullah University of Science and Technology; 2019. Available from: http://hdl.handle.net/10754/644887
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Colorado State University
8.
Meisner, Noah.
Entropy stability for a fourth-order accurate finite-volume method for Burgers' equation.
Degree: MS(M.S.), Mechanical Engineering, 2019, Colorado State University
URL: http://hdl.handle.net/10217/195421
► Computational fluid dynamics (CFD) algorithms need efficiency, accuracy, and robustness to be useful to engineers. Faster computers improve the effective speed of a given method,…
(more)
▼ Computational fluid dynamics (CFD) algorithms need efficiency, accuracy, and robustness to be useful to engineers. Faster computers improve the effective speed of a given method, and larger memories allow higher grid resolution, improving accuracy. However, robustness cannot be achieved through advancements in computer hardware. Improvements in this area require a fundamental understanding of the mathematical and physical aspects of the algorithm being investigated. For high-order numerical algorithms, the stability can easily be aggravated with the presence of strong gradients. Many methods in CFD incorporate some kind of numerical limiter to suppress spurious oscillations and handle nonlinear instabilities for flows with strong discontinuities. However, these limiters often lack a basis in the physics that governs the fluid flow. For this reason, the present research employs a limiting method that is based on the second law of thermodynamics to achieve numerical robustness for a higher order code in solving flows with strong discontinuities. The aim of this work is to address the question of robustness for a high-order
finite-
volume method (FVM) by extending the entropy stability strategy developed by Marshal L. Merriam for a second-order FVM. Unlike generic limiters or artificial viscosity, the approach explored in this thesis provides a physical, quantitative explanation for artificial viscosity or limiters in the form of entropy. The mathematical derivation of the entropy stability method is presented in detail, shortcomings of the method by Merriam are explored, and a more robust approach to deriving an entropy stable limiting method was carried out for the low-order methods. As a first step, this study focuses on the application to Burgers' equation for both a first- and second-order accurate solution to a problem with the onset of shocks. Then, a cell entropy fix for the fourth-order discretization scheme is derived and applied to Burgers' equations. Although the oscillations near the discontinuities can be mitigated, the logical conditions associated with ensuring the entropy constraints become impractical to implement for high-order discretization schemes. Through this research, it is deemed that the entropy stability method proposed by Merriam may not be a viable solution to effectively suppress oscillations near strong discontinuities of problems governed by systems of nonlinear equations, particularly, for high-order schemes.
Advisors/Committee Members: Gao, Xinfeng (advisor), Guzik, Stephen (committee member), Liu, Jiannguo (committee member).
Subjects/Keywords: Computational; Finite-Volume; Algorithm; Fluid; Dynamics
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APA ·
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Manager
APA (6th Edition):
Meisner, N. (2019). Entropy stability for a fourth-order accurate finite-volume method for Burgers' equation. (Masters Thesis). Colorado State University. Retrieved from http://hdl.handle.net/10217/195421
Chicago Manual of Style (16th Edition):
Meisner, Noah. “Entropy stability for a fourth-order accurate finite-volume method for Burgers' equation.” 2019. Masters Thesis, Colorado State University. Accessed November 17, 2019.
http://hdl.handle.net/10217/195421.
MLA Handbook (7th Edition):
Meisner, Noah. “Entropy stability for a fourth-order accurate finite-volume method for Burgers' equation.” 2019. Web. 17 Nov 2019.
Vancouver:
Meisner N. Entropy stability for a fourth-order accurate finite-volume method for Burgers' equation. [Internet] [Masters thesis]. Colorado State University; 2019. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10217/195421.
Council of Science Editors:
Meisner N. Entropy stability for a fourth-order accurate finite-volume method for Burgers' equation. [Masters Thesis]. Colorado State University; 2019. Available from: http://hdl.handle.net/10217/195421
Virginia Tech
9.
Wiersma, Codi Allen.
The Automation of Numerical Models of Coseismic Tsunamis.
Degree: MS, Geosciences, 2019, Virginia Tech
URL: http://hdl.handle.net/10919/93273
► The use of tsunami models for applications of 'now-casting', which is the prediction of the present and near future behavior, has limited exploration, and could…
(more)
▼ The use of tsunami models for applications of 'now-casting', which is the prediction of the present and near future behavior, has limited exploration, and could potentially be of significant usefulness. Tsunamis are most often caused by earthquakes in subduction zones, which generates coupled uplift and subsidence, and displaces the water column. The behavior of the fault failure is difficult to describe in the short term, often requiring seismic waveform inversion, which takes a length of time on the order of weeks to months to properly model, and is much too late for any use in a now-casting sense. To expedite this length of time, a series of source models are created with variable fault geometry behaviors, using fault parameters from Northern Oceanic and Atmospheric Administration's Short-term Inundation and Forecasting of Tsunamis (SIFT) database, in order to model a series of potential tsunami behaviors using the numerical modelling package, GeoClaw. The implementation of modeling could identify areas of interest for further study that are sensitive to fault failure geometry. Initial results show that by varying the geometry of sub-faults of a given earthquake, the resulting tsunami models behave fairly differently with different wave dispersion behavior, both in pattern and magnitude. While there are shortcomings of the potential geometries the code created in this study, and there are significant improvements that can be made, this study provides a good starting point into now-casting of tsunami models, with future iterations likely involving statistical probability in the fault failure geometries.
Advisors/Committee Members: Weiss, Robert (committeechair), Warburton, Timothy (committee member), Stamps, D. Sarah (committee member), Chapman, Martin C. (committee member).
Subjects/Keywords: Numerical Modeling; Tsunami; GeoClaw; Finite Volume
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APA (6th Edition):
Wiersma, C. A. (2019). The Automation of Numerical Models of Coseismic Tsunamis. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/93273
Chicago Manual of Style (16th Edition):
Wiersma, Codi Allen. “The Automation of Numerical Models of Coseismic Tsunamis.” 2019. Masters Thesis, Virginia Tech. Accessed November 17, 2019.
http://hdl.handle.net/10919/93273.
MLA Handbook (7th Edition):
Wiersma, Codi Allen. “The Automation of Numerical Models of Coseismic Tsunamis.” 2019. Web. 17 Nov 2019.
Vancouver:
Wiersma CA. The Automation of Numerical Models of Coseismic Tsunamis. [Internet] [Masters thesis]. Virginia Tech; 2019. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10919/93273.
Council of Science Editors:
Wiersma CA. The Automation of Numerical Models of Coseismic Tsunamis. [Masters Thesis]. Virginia Tech; 2019. Available from: http://hdl.handle.net/10919/93273
University of Pretoria
10.
Suliman, Ridhwaan.
Development of
parallel strongly coupled hybrid fluid-structure interaction
technology involving thin geometrically non-linear
structures.
Degree: Mechanical and Aeronautical
Engineering, 2012, University of Pretoria
URL: http://hdl.handle.net/2263/24288
► This work details the development of a computational tool that can accurately model strongly-coupled fluid-structure-interaction (FSI) problems, with a particular focus on thin-walled structures undergoing…
(more)
▼ This work details the development of a computational tool
that can accurately model strongly-coupled
fluid-structure-interaction (FSI) problems, with a particular focus
on thin-walled structures undergoing large, geometrically
non-linear deformations, which has a major interest in, amongst
others, the aerospace and biomedical industries. The first part of
this work investigates improving the efficiency with which a stable
and robust in-house code, Elemental, models thin structures
undergoing dynamic fluid-induced bending deformations. Variations
of the existing
finite volume formulation as well as linear and
higher-order
finite element formulations are implemented. The
governing equations for the solid domain are formulated in a total
Lagrangian or undeformed conguration and large geometrically
non-linear deformations are accounted for. The set of equations is
solved via a single-step Jacobi iterative scheme which is
implemented such as to ensure a matrix-free and robust solution.
Second-order accurate temporal discretisation is achieved via
dual-timestepping, with both consistent and lumped mass matrices
and with a Jacobi pseudo-time iteration method employed for
solution purposes. The matrix-free approach makes the scheme
particularly well-suited for distributed memory parallel hardware
architectures. Three key outcomes, not well documented in
literature, are highlighted: the issue of shear locking or
sensitivity to element aspect ratio, which is a common problem with
the linear Q4
finite element formulation when subjected to bending,
is evaluated on the
finite volume formulations; a rigorous
comparison of
finite element vs.
finite volume methods on
geometrically non-linear structures is done; a higher-order
finite
volume solid mechanics procedure is developed and evaluated. The
second part of this work is concerned with fluid-structure
interaction (FSI) modelling. It considers the implementation and
coupling of a higher order
finite element structural solver with
the existing
finite volume fluid-flow solver in Elemental. To the
author’s knowledge, this is the first instance in which a
strongly-coupled hybrid
finite element–
finite volume FSI
formulation is developed. The coupling between the fluid and
structural components with non-matching nodes is rigorously
assessed. A new partitioned fluid-solid interface coupling
methodology is also developed, which ensures stable partitioned
solution for strongly-coupled problems without any additional
computational overhead. The solver is parallelised for distributed
memory parallel hardware architectures. The developed technology is
successfully validated through rigorous temporal and mesh
independent studies of representative two-dimensional
strongly-coupled large-displacement FSI test problems for which
analytical or benchmark solutions exist.
Advisors/Committee Members: Prof A G Malan (advisor), Dr S Kok (advisor), Prof J P Meyer (advisor).
Subjects/Keywords: Fluid-structure interaction; Finite
volume; Finite
element;
UCTD
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Suliman, R. (2012). Development of
parallel strongly coupled hybrid fluid-structure interaction
technology involving thin geometrically non-linear
structures. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/24288
Chicago Manual of Style (16th Edition):
Suliman, Ridhwaan. “Development of
parallel strongly coupled hybrid fluid-structure interaction
technology involving thin geometrically non-linear
structures.” 2012. Masters Thesis, University of Pretoria. Accessed November 17, 2019.
http://hdl.handle.net/2263/24288.
MLA Handbook (7th Edition):
Suliman, Ridhwaan. “Development of
parallel strongly coupled hybrid fluid-structure interaction
technology involving thin geometrically non-linear
structures.” 2012. Web. 17 Nov 2019.
Vancouver:
Suliman R. Development of
parallel strongly coupled hybrid fluid-structure interaction
technology involving thin geometrically non-linear
structures. [Internet] [Masters thesis]. University of Pretoria; 2012. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/2263/24288.
Council of Science Editors:
Suliman R. Development of
parallel strongly coupled hybrid fluid-structure interaction
technology involving thin geometrically non-linear
structures. [Masters Thesis]. University of Pretoria; 2012. Available from: http://hdl.handle.net/2263/24288
University of Pretoria
11.
[No author].
Development of parallel strongly coupled hybrid
fluid-structure interaction technology involving thin geometrically
non-linear structures
.
Degree: 2012, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-05022012-001550/
► This work details the development of a computational tool that can accurately model strongly-coupled fluid-structure-interaction (FSI) problems, with a particular focus on thin-walled structures undergoing…
(more)
▼ This work details the development of a computational
tool that can accurately model strongly-coupled
fluid-structure-interaction (FSI) problems, with a particular focus
on thin-walled structures undergoing large, geometrically
non-linear deformations, which has a major interest in, amongst
others, the aerospace and biomedical industries. The first part of
this work investigates improving the efficiency with which a stable
and robust in-house code, Elemental, models thin structures
undergoing dynamic fluid-induced bending deformations. Variations
of the existing
finite volume formulation as well as linear and
higher-order
finite element formulations are implemented. The
governing equations for the solid domain are formulated in a total
Lagrangian or undeformed conguration and large geometrically
non-linear deformations are accounted for. The set of equations is
solved via a single-step Jacobi iterative scheme which is
implemented such as to ensure a matrix-free and robust solution.
Second-order accurate temporal discretisation is achieved via
dual-timestepping, with both consistent and lumped mass matrices
and with a Jacobi pseudo-time iteration method employed for
solution purposes. The matrix-free approach makes the scheme
particularly well-suited for distributed memory parallel hardware
architectures. Three key outcomes, not well documented in
literature, are highlighted: the issue of shear locking or
sensitivity to element aspect ratio, which is a common problem with
the linear Q4
finite element formulation when subjected to bending,
is evaluated on the
finite volume formulations; a rigorous
comparison of
finite element vs.
finite volume methods on
geometrically non-linear structures is done; a higher-order
finite
volume solid mechanics procedure is developed and evaluated. The
second part of this work is concerned with fluid-structure
interaction (FSI) modelling. It considers the implementation and
coupling of a higher order
finite element structural solver with
the existing
finite volume fluid-flow solver in Elemental. To the
author’s knowledge, this is the first instance in which a
strongly-coupled hybrid
finite element–
finite volume FSI
formulation is developed. The coupling between the fluid and
structural components with non-matching nodes is rigorously
assessed. A new partitioned fluid-solid interface coupling
methodology is also developed, which ensures stable partitioned
solution for strongly-coupled problems without any additional
computational overhead. The solver is parallelised for distributed
memory parallel hardware architectures. The developed technology is
successfully validated through rigorous temporal and mesh
independent studies of representative two-dimensional
strongly-coupled large-displacement FSI test problems for which
analytical or benchmark solutions exist.
Advisors/Committee Members: Prof A G Malan (advisor), Dr S Kok (advisor), Prof J P Meyer (advisor).
Subjects/Keywords: Fluid-structure interaction;
Finite volume;
Finite element;
UCTD
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
author], [. (2012). Development of parallel strongly coupled hybrid
fluid-structure interaction technology involving thin geometrically
non-linear structures
. (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-05022012-001550/
Chicago Manual of Style (16th Edition):
author], [No. “Development of parallel strongly coupled hybrid
fluid-structure interaction technology involving thin geometrically
non-linear structures
.” 2012. Masters Thesis, University of Pretoria. Accessed November 17, 2019.
http://upetd.up.ac.za/thesis/available/etd-05022012-001550/.
MLA Handbook (7th Edition):
author], [No. “Development of parallel strongly coupled hybrid
fluid-structure interaction technology involving thin geometrically
non-linear structures
.” 2012. Web. 17 Nov 2019.
Vancouver:
author] [. Development of parallel strongly coupled hybrid
fluid-structure interaction technology involving thin geometrically
non-linear structures
. [Internet] [Masters thesis]. University of Pretoria; 2012. [cited 2019 Nov 17].
Available from: http://upetd.up.ac.za/thesis/available/etd-05022012-001550/.
Council of Science Editors:
author] [. Development of parallel strongly coupled hybrid
fluid-structure interaction technology involving thin geometrically
non-linear structures
. [Masters Thesis]. University of Pretoria; 2012. Available from: http://upetd.up.ac.za/thesis/available/etd-05022012-001550/
University of Windsor
12.
Salih, Ali.
A New Cell-Centred Finite Difference Scheme for CFD Simulations.
Degree: MA, Mechanical, Automotive, and Materials Engineering, 2011, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5388
► The governing partial differential equations of fluid motion are usually numerically approximated using one of the three classical methods: Finite Difference (FD), Finite Volume…
(more)
▼ The governing partial differential equations of fluid motion are usually numerically approximated using one of the three classical methods:
Finite Difference (FD),
Finite Volume (FV) or
Finite Element (FE). In this thesis, a new cell-centred FD (CCFD) formulation is developed, in which the governing fluid flow equations are differenced over all the cell centres instead of grid points. The nodes (grid points) are then updated by averaging the property from all the cell centres that share that node. This feature, which is motivated by development of the FV method, allows the application of the proposed FD numerical formulation on unstructured grids. Several test cases are investigated here to illustrate this approach. To verify the results, the analytical solution for the test case is used if available. Otherwise, the numerical solution is compared to the traditional FD solution.
Advisors/Committee Members: Ronald M Barron.
Subjects/Keywords: Cell-Centred; Finite Difference; Finite Volume; Numerical Simulation; PDE
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Salih, A. (2011). A New Cell-Centred Finite Difference Scheme for CFD Simulations. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5388
Chicago Manual of Style (16th Edition):
Salih, Ali. “A New Cell-Centred Finite Difference Scheme for CFD Simulations.” 2011. Masters Thesis, University of Windsor. Accessed November 17, 2019.
https://scholar.uwindsor.ca/etd/5388.
MLA Handbook (7th Edition):
Salih, Ali. “A New Cell-Centred Finite Difference Scheme for CFD Simulations.” 2011. Web. 17 Nov 2019.
Vancouver:
Salih A. A New Cell-Centred Finite Difference Scheme for CFD Simulations. [Internet] [Masters thesis]. University of Windsor; 2011. [cited 2019 Nov 17].
Available from: https://scholar.uwindsor.ca/etd/5388.
Council of Science Editors:
Salih A. A New Cell-Centred Finite Difference Scheme for CFD Simulations. [Masters Thesis]. University of Windsor; 2011. Available from: https://scholar.uwindsor.ca/etd/5388
University of Texas – Austin
13.
Trembacki, Bradley Louis.
Electrochemical transport simulation of 3D lithium-ion battery electrode microstructures.
Degree: PhD, Mechanical Engineering, 2015, University of Texas – Austin
URL: http://hdl.handle.net/2152/63883
► Lithium-ion batteries are commonly modeled using a volume-averaged formulation (porous electrode theory) in order to simulate battery behavior on a large scale. These methods utilize…
(more)
▼ Lithium-ion batteries are commonly modeled using a
volume-averaged formulation (porous electrode theory) in order to simulate battery behavior on a large scale. These methods utilize effective material properties and assume a simplified spherical geometry of the electrode particles. In contrast, a particle-scale (non-porous electrode) simulation applied to resolved electrode geometries predicts localized phenomena. Complete simulations of batteries require a coupling of the two scales to resolve the relevant physics. A central focus of this thesis is to develop a fully-coupled
finite volume methodology for the simulation of the electrochemical equations in a lithium-ion battery cell at both the particle scale and using
volume-averaged formulations. Due to highly complex electrode geometries at the particle scale, the formulation employs an unstructured computational mesh and is implemented within the MEMOSA software framework of Purdue’s PRISM (Prediction of Reliability, Integrity and Survivability of Microsystems) center. Stable and efficient algorithms are developed for full coupling of the nonlinear species transport equations, electrostatics, and Butler-Volmer kinetics. The model is applied to synthetic electrode particle beds for comparison with porous electrode theory simulations and to evaluate numerical performance capabilities. The model is also applied to a half-cell mesh created from a real cathode particle bed reconstruction to demonstrate the feasibility of such simulations. The second focus of the thesis is to investigate 3D battery electrode architectures that offer potential energy density and power density improvements over traditional particle bed battery geometries. A singular feature of these geometries is their interpenetrating nature, which significantly reduces diffusion distance. Advancement of micro-scale additive manufacturing techniques has made it possible to fabricate these electrode microarchitectures. A fully-coupled
finite volume methodology for the transport equations coupled to the relevant electrochemistry is implemented in the PETSc (Portable, Extensible Toolkit for Scientific Computation) software framework which allows for a straightforward scalable simulation on orthogonal hexahedral meshes. Such scalability becomes important when performing simulations on fully resolved microstructures with many parameter sweeps across multiple variables. Using the computational model, a variety of 3D battery electrode geometries are simulated and compared across various battery discharge rates and length scales in order to quantify performance trends and investigate geometrical factors that improve battery performance. The energy density and power density of the 3D battery microstructures are compared in several ways, including a uniform surface area to
volume ratio comparison as well as a comparison requiring a minimum manufacturable feature size. Significant performance improvements over traditional particle bed electrode designs are observed, and electrode microarchitectures…
Advisors/Committee Members: Murthy, Jayathi (advisor), Moser, Robert D (committee member), Roberts, Scott A (committee member), Duoss, Eric B (committee member), Chen, Dongmei (committee member).
Subjects/Keywords: Battery; Simulation; Lithium-ion; Microstructure; Transport; Finite volume; Interpenetrating; Particle-scale; Volume-averaged; PETSc
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Trembacki, B. L. (2015). Electrochemical transport simulation of 3D lithium-ion battery electrode microstructures. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/63883
Chicago Manual of Style (16th Edition):
Trembacki, Bradley Louis. “Electrochemical transport simulation of 3D lithium-ion battery electrode microstructures.” 2015. Doctoral Dissertation, University of Texas – Austin. Accessed November 17, 2019.
http://hdl.handle.net/2152/63883.
MLA Handbook (7th Edition):
Trembacki, Bradley Louis. “Electrochemical transport simulation of 3D lithium-ion battery electrode microstructures.” 2015. Web. 17 Nov 2019.
Vancouver:
Trembacki BL. Electrochemical transport simulation of 3D lithium-ion battery electrode microstructures. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2015. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/2152/63883.
Council of Science Editors:
Trembacki BL. Electrochemical transport simulation of 3D lithium-ion battery electrode microstructures. [Doctoral Dissertation]. University of Texas – Austin; 2015. Available from: http://hdl.handle.net/2152/63883
Texas A&M University
14.
Frisani, Angelo 1980-.
Direct Forcing Immersed Boundary Methods: Finite Element Versus Finite Volume Approach.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148236
► Two immersed boundary methods (IBM) for the simulation of conjugate heat transfer problems with complex geometries are introduced: a finite element (IFEM) and a finite…
(more)
▼ Two immersed boundary methods (IBM) for the simulation of conjugate heat transfer problems with complex geometries are introduced: a
finite element (IFEM) and a
finite volume (IFVM) immersed boundary methods are discussed. In the IFEM a projection approach is presented for the coupled system of time-dependent incompressible Navier-Stokes equations (NSEs) and energy equation in conjunction with the immersed boundary method for solving fluid flow and heat transfer problems in the presence of rigid objects not represented by the underlying mesh. The IBM allows solving the flow for geometries with complex objects without the need of generating a body-fitted mesh. Dirichlet boundary constraints are satisfied applying a boundary force at the immersed body surface. Using projection and interpolation operators from the fluid
volume mesh to the solid surface mesh (i.e., the ?immersed? boundary) and vice versa, it is possible to impose the extra constraint to the NSEs as a Lagrange multiplier in a fashion very similar to the effect pressure has on the momentum equations to satisfy the divergence-free constraint. The IFEM approach presented shows third order accuracy in space and second order accuracy in time when the simulation results for the Taylor-Green decaying vortex are compared to the analytical solution.
For the IFVM a ghost-cell approach with sharp interface scheme is used to enforce the boundary condition at the fluid/solid interface. The interpolation procedure at the immersed boundary preserves the overall second order accuracy of the base solver. The developed ghost-cell method is applied on a staggered configuration with the Semi-Implicit Method for Pressure-Linked Equations Revised algorithm. Second order accuracy in space and first order accuracy in time are obtained when the Taylor-Green decaying vortex test case is compared to the IFVM analytical solution.
Computations were performed using the IFEM and IFVM approaches for the two-dimensional flow over a backward-facing step, two-dimensional flow past a stationary circular cylinder, three-dimensional flow past a sphere and two and three-dimensional natural convection in an enclosure with/without immersed body. The numerical results obtained with the discussed IFEM and IFVM were compared against other IBMs available in literature and simulations performed with the commercial computational fluid dynamics code STAR-CCM+/V7.04.006. The benchmark test cases showed that the numerical results obtained with the implemented immersed boundary methods are in good agreement with the predictions from STAR-CCM+ and the numerical data from the other IBMs. The immersed boundary method based of
finite element approach is numerically more accurate than the IBM based on
finite volume discretization. In contrast, the latter is computationally more efficient than the former.
Advisors/Committee Members: Hassan, Yassin A (advisor), Annamalai, Kalyan (committee member), Chen, Hamn-Ching (committee member), Marlow, William H (committee member).
Subjects/Keywords: immersed boundary; sharp interface; diffuse interface; direct forcing; finite volume; finite element
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Frisani, A. 1. (2012). Direct Forcing Immersed Boundary Methods: Finite Element Versus Finite Volume Approach. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148236
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Frisani, Angelo 1980-. “Direct Forcing Immersed Boundary Methods: Finite Element Versus Finite Volume Approach.” 2012. Thesis, Texas A&M University. Accessed November 17, 2019.
http://hdl.handle.net/1969.1/148236.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Frisani, Angelo 1980-. “Direct Forcing Immersed Boundary Methods: Finite Element Versus Finite Volume Approach.” 2012. Web. 17 Nov 2019.
Vancouver:
Frisani A1. Direct Forcing Immersed Boundary Methods: Finite Element Versus Finite Volume Approach. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/1969.1/148236.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Frisani A1. Direct Forcing Immersed Boundary Methods: Finite Element Versus Finite Volume Approach. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148236
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
15.
Elsworth, Cooper W.
Verification of an Overset-grid Enabled Fluid-structure
Interaction Solver.
Degree: MS, Engineering Science and Mechanics, 2014, Penn State University
URL: https://etda.libraries.psu.edu/catalog/22622
► Coupled systems occur when two domains governed by dissimilar physics interact dynamically, resulting in strong two-way coupling between the domains. Research into these systems has…
(more)
▼ Coupled systems occur when two domains governed by
dissimilar physics interact dynamically, resulting in strong
two-way coupling between the domains. Research into these systems
has become increasingly prevalent due to the wide variety of
physical examples that exhibit these characteristics, as well as
recent advancements in computational capability and parallelism. A
notable example of coupled systems occurs in fluid-structure
interaction (FSI), in which a deformable solid is surrounded by
and/or immersed in a fluid. These systems exhibit strong, two-way
coupling between the fluid and solid domains that require the
development of expanded computational methods to solve. While
current methods have provided the basis for the solution of these
types of problems, optimizations are needed to solve realistic FSI
problems. Existing overset mesh technology has been incorporated
into an ALE based Fluid-Structure Interaction (FSI) code, producing
a novel approach for investigating fully-coupled FSI phenomena. In
particular, the Suggar++/DiRTlib overset mesh technology has been
implemented into a partitioned FSI solver based on OpenFOAM and an
in-house structural code. The impetus of this solver has been to
address some of the problems that occur in complex FSI simulations,
most notably concerns with the mesh motion experienced in large
deformation cases. The overset solver intends to simplify mesh
generation, maintain mesh quality throughout the simulation, and
provide similar performance to current approaches. This thesis
provides verification of the overset FSI solver and presents the
effects of overset methods on FSI simulations. Verification is
presented through the method of manufactured solutions on the
disparate solver components and mesh refinement studies are
performed on the coupled code. The method of manufactured solutions
provides rigorous code verification, with error magnitudes and
solver convergence rates determined for the separate solver
components. Discussion of the challenges experienced in the
establishment of a unified manufactured solution for partitioned
FSI algorithms is also presented. The disparate solvers used in
this work are found to exhibit the expected orders of convergence,
verifying the correct implementation of the governing equations in
these domains. A mesh refinement study with Richardson
extrapolation further confirms the monotonic convergence of the FSI
solution, and provides insight into the order of accuracy of the
coupled solver. Use of the Turek and Hron benchmark case
facilitates a consistent comparison of the proposed solver to
current FSI methods and performance. Simulation data is presented,
while investigations into the benefits of overset methods for FSI
simulations is discussed. In addition, the relative performance of
the solver is presented, in order to address the viability of the
proposed solver's application.
Subjects/Keywords: Fluid-Structure Interaction; Verification; Method of
Manufactured Solutions; Overset; Finite Volume; Finite
Element
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Elsworth, C. W. (2014). Verification of an Overset-grid Enabled Fluid-structure
Interaction Solver. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/22622
Chicago Manual of Style (16th Edition):
Elsworth, Cooper W. “Verification of an Overset-grid Enabled Fluid-structure
Interaction Solver.” 2014. Masters Thesis, Penn State University. Accessed November 17, 2019.
https://etda.libraries.psu.edu/catalog/22622.
MLA Handbook (7th Edition):
Elsworth, Cooper W. “Verification of an Overset-grid Enabled Fluid-structure
Interaction Solver.” 2014. Web. 17 Nov 2019.
Vancouver:
Elsworth CW. Verification of an Overset-grid Enabled Fluid-structure
Interaction Solver. [Internet] [Masters thesis]. Penn State University; 2014. [cited 2019 Nov 17].
Available from: https://etda.libraries.psu.edu/catalog/22622.
Council of Science Editors:
Elsworth CW. Verification of an Overset-grid Enabled Fluid-structure
Interaction Solver. [Masters Thesis]. Penn State University; 2014. Available from: https://etda.libraries.psu.edu/catalog/22622
Virginia Tech
16.
Bloxom, Andrew Lawrence.
Numerical Simulation of the Fluid-Structure Interaction of a Surface Effect Ship Bow Seal.
Degree: PhD, Aerospace and Ocean Engineering, 2014, Virginia Tech
URL: http://hdl.handle.net/10919/50592
► Numerical simulations of fluid-structure interaction (FSI) problems were performed in an effort to verify and validate a commercially available FSI tool. This tool uses an…
(more)
▼ Numerical simulations of fluid-structure interaction (FSI) problems were performed in an effort to verify and validate a commercially available FSI tool. This tool uses an iterative partitioned coupling scheme between CD-adapco's STAR-CCM+
finite volume fluid solver and Simulia's Abaqus
finite element structural solver to simulate the FSI response of a system. Preliminary verification and validation work (VandV) was carried out to understand the numerical behavior of the codes individually and together as a FSI tool.
Verification and Validation work that was completed included code order verification of the respective fluid and structural solvers with Couette-Pouiselle flow and Euler-Bernoulli beam theory. These results confirmed the 2nd order accuracy of the spatial discretizations used. Following that, a mixture of solution verifications and model calibrations was performed with the inclusion of the physics models implemented in the solution of the FSI problems. Solution verifications were completed for fluid and structural stand-alone models as well as for the coupled FSI solutions. These results re-confirmed the spatial order of accuracy but for more complex flows and physics models as well as the order of accuracy of the temporal discretizations. In lieu of a good material definition, model calibration is performed to reproduce the experimental results. This work used model calibration for both instances of hyperelastic materials which were presented in the literature as validation cases because these materials were defined as linear elastic.
Calibrated, three dimensional models of the bow seal on the University of Michigan bow seal test platform showed the ability to reproduce the experimental results qualitatively through averaging of the forces and seal displacements. These simulations represent the only current 3D results for this case. One significant result of this study is the ability to visualize the flow around the seal and to directly measure the seal resistances at varying cushion pressures, seal immersions, forward speeds, and different seal materials. SES design analysis could greatly benefit from the inclusion of flexible seals in simulations, and this work is a positive step in that direction. In future work, the inclusion of more complex seal geometries and contact will further enhance the capability of this tool.
Advisors/Committee Members: Neu, Wayne L. (committeechair), McCue-Weil, Leigh S. (committee member), Yim, Solomon C. (committee member), Roy, Christopher John (committee member).
Subjects/Keywords: Surface Effect Ship; Bow Seal; Finite Volume; Finite Element; Fluid-Structure Interaction; Iterative Partitioned Coupling
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APA (6th Edition):
Bloxom, A. L. (2014). Numerical Simulation of the Fluid-Structure Interaction of a Surface Effect Ship Bow Seal. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/50592
Chicago Manual of Style (16th Edition):
Bloxom, Andrew Lawrence. “Numerical Simulation of the Fluid-Structure Interaction of a Surface Effect Ship Bow Seal.” 2014. Doctoral Dissertation, Virginia Tech. Accessed November 17, 2019.
http://hdl.handle.net/10919/50592.
MLA Handbook (7th Edition):
Bloxom, Andrew Lawrence. “Numerical Simulation of the Fluid-Structure Interaction of a Surface Effect Ship Bow Seal.” 2014. Web. 17 Nov 2019.
Vancouver:
Bloxom AL. Numerical Simulation of the Fluid-Structure Interaction of a Surface Effect Ship Bow Seal. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10919/50592.
Council of Science Editors:
Bloxom AL. Numerical Simulation of the Fluid-Structure Interaction of a Surface Effect Ship Bow Seal. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/50592
University of Edinburgh
17.
Hamilton, Brian.
Finite difference and finite volume methods for wave-based modelling of room acoustics.
Degree: PhD, 2016, University of Edinburgh
URL: http://hdl.handle.net/1842/22940
► Wave-based models of sound propagation can be used to predict and synthesize sounds as they would be heard naturally in room acoustic environments. The numerical…
(more)
▼ Wave-based models of sound propagation can be used to predict and synthesize sounds as they would be heard naturally in room acoustic environments. The numerical simulation of such models with traditional time-stepping grid-based methods can be an expensive process, due to the sheer size of listening environments (e.g., auditoriums and concert halls) and due to the temporal resolution required by audio rates that resolve frequencies up to the limit of human hearing. Finite difference methods comprise a simple starting point for such simulations, but they are known to suffer from approximation errors that may necessitate expensive grid refinements in order to achieve sufficient levels of accuracy. As such, a significant amount of research has gone into designing finite difference methods that are highly accurate while remaining computationally efficient. The problem of designing and using accurate finite difference schemes is compounded by the fact that room acoustics models require complex boundary conditions to model frequency-dependent wall impedances over non-trivial geometries. The implementation of such boundary conditions in a numerically stable manner has been a challenge for some time. Stable boundary conditions for finite difference room acoustics simulations have been formulated in the past, but generally they have only been useful in modelling trivial geometries (e.g., idealised shoebox halls). Finite volume methods have recently been shown to be a viable solution to the problem of complex boundary conditions over non-trivial geometries, and they also allow for the use of energy methods for numerical stability analyses. Finite volume methods lend themselves naturally to fully unstructured grids and they can simplify to the types of grids typically used in finite difference methods. This allows for room acoustics simulation models that balance the simplicity of finite difference methods for wave propagation in air with the detail of finite volume methods for the modelling of complex boundaries. This thesis is an exploration of these two distinct, yet related, approaches to wave-based room acoustic simulations. The overarching theme in this investigation is the balance between accuracy, computational efficiency, and numerical stability. Higher-order and optimised schemes in two and three spatial dimensions are derived and compared, towards the goal of finding accurate and efficient finite difference schemes. Numerical stability is analysed using frequency-domain analyses, as well as energy techniques whenever possible, allowing for stable and frequency-dependent boundary conditions appropriate for room acoustics modelling. Along the way, the use of non-Cartesian grids is investigated, geometric relationships between certain finite difference and finite volume schemes are explored, and some problems associated to staircasing effects at boundaries are considered. Also, models of sound absorption in air are incorporated into these numerical schemes, using physical parameters that are appropriate for room…
Subjects/Keywords: 620.2; room acoustics; finite difference methods; finite volume methods; FDTD methods; computational acoustics; numerical methods
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APA (6th Edition):
Hamilton, B. (2016). Finite difference and finite volume methods for wave-based modelling of room acoustics. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/22940
Chicago Manual of Style (16th Edition):
Hamilton, Brian. “Finite difference and finite volume methods for wave-based modelling of room acoustics.” 2016. Doctoral Dissertation, University of Edinburgh. Accessed November 17, 2019.
http://hdl.handle.net/1842/22940.
MLA Handbook (7th Edition):
Hamilton, Brian. “Finite difference and finite volume methods for wave-based modelling of room acoustics.” 2016. Web. 17 Nov 2019.
Vancouver:
Hamilton B. Finite difference and finite volume methods for wave-based modelling of room acoustics. [Internet] [Doctoral dissertation]. University of Edinburgh; 2016. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/1842/22940.
Council of Science Editors:
Hamilton B. Finite difference and finite volume methods for wave-based modelling of room acoustics. [Doctoral Dissertation]. University of Edinburgh; 2016. Available from: http://hdl.handle.net/1842/22940
18.
Straka Robert.
Computational Model of Pulverized Coal Combustion and Nitric Oxide Production
.
Degree: 2011, Czech University of Technology
URL: http://hdl.handle.net/10467/8052
The goal of the work is to develop a model of combustion; The goal of the work is to develop a model of combustion
Advisors/Committee Members: Beneš Michal (advisor).Subjects/Keywords: Navier-Stokes equations; reactive flow; finite-volume method
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APA (6th Edition):
Robert, S. (2011). Computational Model of Pulverized Coal Combustion and Nitric Oxide Production
. (Thesis). Czech University of Technology. Retrieved from http://hdl.handle.net/10467/8052
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Robert, Straka. “Computational Model of Pulverized Coal Combustion and Nitric Oxide Production
.” 2011. Thesis, Czech University of Technology. Accessed November 17, 2019.
http://hdl.handle.net/10467/8052.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Robert, Straka. “Computational Model of Pulverized Coal Combustion and Nitric Oxide Production
.” 2011. Web. 17 Nov 2019.
Vancouver:
Robert S. Computational Model of Pulverized Coal Combustion and Nitric Oxide Production
. [Internet] [Thesis]. Czech University of Technology; 2011. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10467/8052.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Robert S. Computational Model of Pulverized Coal Combustion and Nitric Oxide Production
. [Thesis]. Czech University of Technology; 2011. Available from: http://hdl.handle.net/10467/8052
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Utah
19.
Nelson, Blake William.
Accurate and interactive visualization of high-order finite element fields.
Degree: PhD, Computing (School of), 2012, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1120/rec/128
► High-order finite element methods, using either the continuous or discontinuous Galerkin formulation, are becoming more popular in fields such as fluid mechanics,solid mechanics and computational…
(more)
▼ High-order finite element methods, using either the continuous or discontinuous Galerkin formulation, are becoming more popular in fields such as fluid mechanics,solid mechanics and computational electromagnetics. While the use of these methods is becoming increasingly common, there has not been a corresponding increase in the availability and use of visualization methods and software that are capable of displaying visualizations of these volumes both accurately and interactively. A fundamental problem with the majority of existing visualization techniques is that they do not understandnor respect the structure of a high-order field, leading to visualization error.Visualizations of high-order fields are generally created by first approximating the field with low-order primitives and then generating the visualization using traditionalmethods based on linear interpolation. The approximation step introduces error into the visualization pipeline, which requires the user to balance the competing goals of image quality, interactivity and resource consumption. In practice, visualizationsperformed this way are often either undersampled, leading to visualization error, or oversampled, leading to unnecessary computational effort and resource consumption.Without an understanding of the sources of error, the simulation scientist is unable to determine if artifacts in the image are due to visualization error, insufficient mesh resolution, or a failure in the underlying simulation. This uncertainty makes it difficultfor the scientists to make judgments based on the visualization, as judgments made on the assumption that artifacts are a result of visualization error when they are actually a more fundamental problem can lead to poor decision-making.This dissertation presents new visualization algorithms that use the high-order data in its native state, using the knowledge of the structure and mathematicalproperties of these fields to create accurate images interactively, while avoiding the error introduced by representing the fields with low-order approximations. First, a new algorithm for cut-surfaces is presented, specifically the accurate depiction of colormapsand contour lines on arbitrarily complex cut-surfaces. Second, a mathematical analysis of the evaluation of the volume rendering integral through a high-orderfield is presented, as well as an algorithm that uses this analysis to create accurate volume renderings. Finally, a new software system, the Element Visualizer (ElVis),is presented, which combines the ideas and algorithms created in this dissertation in a single software package that can be used by simulation scientists to create accurate visualizations. This system was developed and tested with the assistance of the ProjectX simulation team. The utility of our algorithms and visualization system are then demonstrated with examples from several high-order fluid flow simulations.
Subjects/Keywords: Cut surfaces; GPU programming; High-order finite elements; Visualization; Volume rendering
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nelson, B. W. (2012). Accurate and interactive visualization of high-order finite element fields. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1120/rec/128
Chicago Manual of Style (16th Edition):
Nelson, Blake William. “Accurate and interactive visualization of high-order finite element fields.” 2012. Doctoral Dissertation, University of Utah. Accessed November 17, 2019.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1120/rec/128.
MLA Handbook (7th Edition):
Nelson, Blake William. “Accurate and interactive visualization of high-order finite element fields.” 2012. Web. 17 Nov 2019.
Vancouver:
Nelson BW. Accurate and interactive visualization of high-order finite element fields. [Internet] [Doctoral dissertation]. University of Utah; 2012. [cited 2019 Nov 17].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1120/rec/128.
Council of Science Editors:
Nelson BW. Accurate and interactive visualization of high-order finite element fields. [Doctoral Dissertation]. University of Utah; 2012. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/1120/rec/128
Queensland University of Technology
20.
Pasdunkorale Arachchige, Jayantha.
Accurate finite volume methods for the numerical simulation of transport in highly anistropic media.
Degree: 2003, Queensland University of Technology
URL: http://eprints.qut.edu.au/37145/
Subjects/Keywords: Finite volume method; thesis; doctoral
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Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Pasdunkorale Arachchige, J. (2003). Accurate finite volume methods for the numerical simulation of transport in highly anistropic media. (Thesis). Queensland University of Technology. Retrieved from http://eprints.qut.edu.au/37145/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pasdunkorale Arachchige, Jayantha. “Accurate finite volume methods for the numerical simulation of transport in highly anistropic media.” 2003. Thesis, Queensland University of Technology. Accessed November 17, 2019.
http://eprints.qut.edu.au/37145/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pasdunkorale Arachchige, Jayantha. “Accurate finite volume methods for the numerical simulation of transport in highly anistropic media.” 2003. Web. 17 Nov 2019.
Vancouver:
Pasdunkorale Arachchige J. Accurate finite volume methods for the numerical simulation of transport in highly anistropic media. [Internet] [Thesis]. Queensland University of Technology; 2003. [cited 2019 Nov 17].
Available from: http://eprints.qut.edu.au/37145/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pasdunkorale Arachchige J. Accurate finite volume methods for the numerical simulation of transport in highly anistropic media. [Thesis]. Queensland University of Technology; 2003. Available from: http://eprints.qut.edu.au/37145/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Oslo
21.
Kostousov, Mikhail.
Analysis of splitting methods for shallow water equations with magnetohydrodynamic.
Degree: 2009, University of Oslo
URL: http://urn.nb.no/URN:NBN:no-23208
;
https://www.duo.uio.no/handle/10852/10907
► In this paper were shown derivation of methods of Roe, Haarten-Lax-Leer and Lax Friedrichs, using of these methods in splitting schemes for shallow water with…
(more)
▼ In this paper were shown derivation of methods of Roe, Haarten-Lax-Leer and Lax Friedrichs, using of these methods in splitting schemes for shallow water with magnetohydrodynamics. An analysis of behavior of such schemes was done and it was shown some issues of using such techneques.
Advisors/Committee Members: Nils Henrik Risebro.
Subjects/Keywords: grunt vann datavitenskap finite volume method; VDP::413
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APA (6th Edition):
Kostousov, M. (2009). Analysis of splitting methods for shallow water equations with magnetohydrodynamic. (Thesis). University of Oslo. Retrieved from http://urn.nb.no/URN:NBN:no-23208 ; https://www.duo.uio.no/handle/10852/10907
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kostousov, Mikhail. “Analysis of splitting methods for shallow water equations with magnetohydrodynamic.” 2009. Thesis, University of Oslo. Accessed November 17, 2019.
http://urn.nb.no/URN:NBN:no-23208 ; https://www.duo.uio.no/handle/10852/10907.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kostousov, Mikhail. “Analysis of splitting methods for shallow water equations with magnetohydrodynamic.” 2009. Web. 17 Nov 2019.
Vancouver:
Kostousov M. Analysis of splitting methods for shallow water equations with magnetohydrodynamic. [Internet] [Thesis]. University of Oslo; 2009. [cited 2019 Nov 17].
Available from: http://urn.nb.no/URN:NBN:no-23208 ; https://www.duo.uio.no/handle/10852/10907.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kostousov M. Analysis of splitting methods for shallow water equations with magnetohydrodynamic. [Thesis]. University of Oslo; 2009. Available from: http://urn.nb.no/URN:NBN:no-23208 ; https://www.duo.uio.no/handle/10852/10907
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
22.
Nelson, Cameron Stuart.
A Higher-Order Numerical Method for Solid Conductive Heat
Transfer.
Degree: MS, Mechanical Engineering, 2016, Penn State University
URL: https://etda.libraries.psu.edu/catalog/28757
► This thesis details the development of a higher-order numerical finite volume method for solid conductive heat transfer. Important thermodynamic and mathematical principles applied are conservation…
(more)
▼ This thesis details the development of a higher-order
numerical finite volume method for solid conductive heat transfer.
Important thermodynamic and mathematical principles applied are
conservation of energy, the heat diffusion equation, Fourier’s Law,
the thermal contact resistance concept, Taylor series expansion,
and the first-order backward Euler time-differencing method. The
higher-order method turns out to be second-order accurate in space
and third-order accurate in time with respect to
temperature.
Subjects/Keywords: higher-order; finite volume; numerical; conduction; heat
transfer
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Nelson, C. S. (2016). A Higher-Order Numerical Method for Solid Conductive Heat
Transfer. (Masters Thesis). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/28757
Chicago Manual of Style (16th Edition):
Nelson, Cameron Stuart. “A Higher-Order Numerical Method for Solid Conductive Heat
Transfer.” 2016. Masters Thesis, Penn State University. Accessed November 17, 2019.
https://etda.libraries.psu.edu/catalog/28757.
MLA Handbook (7th Edition):
Nelson, Cameron Stuart. “A Higher-Order Numerical Method for Solid Conductive Heat
Transfer.” 2016. Web. 17 Nov 2019.
Vancouver:
Nelson CS. A Higher-Order Numerical Method for Solid Conductive Heat
Transfer. [Internet] [Masters thesis]. Penn State University; 2016. [cited 2019 Nov 17].
Available from: https://etda.libraries.psu.edu/catalog/28757.
Council of Science Editors:
Nelson CS. A Higher-Order Numerical Method for Solid Conductive Heat
Transfer. [Masters Thesis]. Penn State University; 2016. Available from: https://etda.libraries.psu.edu/catalog/28757
Montana State University
23.
Kizhakkeveedu Ramachandran, Santhosh.
Numerical analysis of airside characteristics in plain and wavy heat exchangers in the turbulent flow regime.
Degree: College of Engineering, 2010, Montana State University
URL: https://scholarworks.montana.edu/xmlui/handle/1/1649
► Numerical investigation has been performed to study heat transfer and pressure drop characteristics of plain fin and wavy fin heat exchangers in the external airside.…
(more)
▼ Numerical investigation has been performed to study heat transfer and pressure drop characteristics of plain fin and wavy fin heat exchangers in the external airside. The characteristics were studied using the dimensional parameters, friction factor and Colburn factor. The flow rate was varied over the range of 2000 < or = Re < or = 7000 in the turbulent and transitional regimes. The analyses were performed using a
finite volume method. Comparisons with experimental data were performed to validate the numerical results. The geometrical parameters like the fin pitch, transverse pitch, wavy angle and wavy height were varied to study the effects of each individual parameter. Comparisons were also drawn to the laminar range, the effect of number of tube rows and the pattern in which the tube were arranged. The investigation shows that the effect of the number of tube rows on heat transfer coefficient is less after the number of rows is increased beyond four. It is observed that the reducing the fin pitch increases the heat transfer and pressure drop in both the configurations. The increase in transverse pitch resulted in a decrease in thermal and hydraulic characteristics. Response to the variation of wavy angle and wavy height was similar, as the wavy angle and wavy height were increased, the number of corrugations also increased resulting in higher heat transfer and a higher pressure drop. The critical balance between high heat transfer and low pressure drop was analyzed using the efficiency index for each parameter variation. The tube layouts in the staggered form were observed to be better than the in-lined layout for both the configurations.
Advisors/Committee Members: Chairperson, Graduate Committee: M. Ruhul Amin. (advisor).
Subjects/Keywords: Simulation methods.; Finite volume method.; Heat exchangers.; Turbulence.
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APA (6th Edition):
Kizhakkeveedu Ramachandran, S. (2010). Numerical analysis of airside characteristics in plain and wavy heat exchangers in the turbulent flow regime. (Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/1649
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kizhakkeveedu Ramachandran, Santhosh. “Numerical analysis of airside characteristics in plain and wavy heat exchangers in the turbulent flow regime.” 2010. Thesis, Montana State University. Accessed November 17, 2019.
https://scholarworks.montana.edu/xmlui/handle/1/1649.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kizhakkeveedu Ramachandran, Santhosh. “Numerical analysis of airside characteristics in plain and wavy heat exchangers in the turbulent flow regime.” 2010. Web. 17 Nov 2019.
Vancouver:
Kizhakkeveedu Ramachandran S. Numerical analysis of airside characteristics in plain and wavy heat exchangers in the turbulent flow regime. [Internet] [Thesis]. Montana State University; 2010. [cited 2019 Nov 17].
Available from: https://scholarworks.montana.edu/xmlui/handle/1/1649.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kizhakkeveedu Ramachandran S. Numerical analysis of airside characteristics in plain and wavy heat exchangers in the turbulent flow regime. [Thesis]. Montana State University; 2010. Available from: https://scholarworks.montana.edu/xmlui/handle/1/1649
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
24.
Cozzi, Olivier.
Free surface flow simulation: correcting and benchmarking
the ALE method in Code_Saturne.
Degree: 2011, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122180
► The present thesis was written by Olivier Cozzi at the University of Manchester in pursuance of the degree of Master of Philosophy in 2010. It…
(more)
▼ The present thesis was written by Olivier Cozzi at
the University of Manchester in pursuance of the degree of Master
of Philosophy in 2010. It presents “Free surface flow simulation:
correcting and benchmarking the ALE method in Code_Saturne”, that
is to say the implementation of free surface flows within
Code_Saturne, an in-house code developed by EDF (Électricité de
France) to solve CFD problems, using the Arbitrary Lagrangian
Eulerian (ALE) method already embedded in this code. For a code
like Code_Saturne, which aims at being easily implemented in a wide
range of applications, the handling of free surface flows is
critical because it extends the range of possible applications
(tank filling, marine turbine interactions with waves and currents,
water supply and reject points ...). Up to now, the ALE module
within Code_Saturne was only used for fluid coupling with a solid
structure; thus we had to adapt it to free-surface flows by adding
a convergence loop to perform the free surface movement
incrementally within each time step. Afterwards, the geometry was
updated at the outer iterations level by imposing the displacement
of each cell-vertex within the global domain: the cell-vertex
motion is then computed for the free-surface cell-vertices in the
first place and for the internal cell-vertices secondly. The new
free-surface module was then implemented to three different test
cases: a standing wave in a tank (unsteady test case with a
periodic analytic solution), a solitary wave in a tank (unsteady
test case with an analytic solution), a submerged hydrofoil (steady
test case with experimental measurements). The results are
encouraging and the feasibility is clearly demonstrated. Some
limitations still exist – mainly caused by the inaccurate
interpolation performed by Code_Saturne between the free-surface
cell-vertex displacement and the free-surface cell-face centre
velocities – but these could be eliminated during the next stages
of the project.
Advisors/Committee Members: Stansby, Peter.
Subjects/Keywords: finite volume method; ALE method; free surface flows; Code_Saturne
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Export
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Manager
APA (6th Edition):
Cozzi, O. (2011). Free surface flow simulation: correcting and benchmarking
the ALE method in Code_Saturne. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122180
Chicago Manual of Style (16th Edition):
Cozzi, Olivier. “Free surface flow simulation: correcting and benchmarking
the ALE method in Code_Saturne.” 2011. Doctoral Dissertation, University of Manchester. Accessed November 17, 2019.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122180.
MLA Handbook (7th Edition):
Cozzi, Olivier. “Free surface flow simulation: correcting and benchmarking
the ALE method in Code_Saturne.” 2011. Web. 17 Nov 2019.
Vancouver:
Cozzi O. Free surface flow simulation: correcting and benchmarking
the ALE method in Code_Saturne. [Internet] [Doctoral dissertation]. University of Manchester; 2011. [cited 2019 Nov 17].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122180.
Council of Science Editors:
Cozzi O. Free surface flow simulation: correcting and benchmarking
the ALE method in Code_Saturne. [Doctoral Dissertation]. University of Manchester; 2011. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:122180
Universitat Rovira i Virgili
25.
Usera Velasco, Gabriel.
Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry.
Degree: Departament d'Enginyeria Mecànica, 2009, Universitat Rovira i Virgili
URL: http://hdl.handle.net/10803/8495
► This thesis deals with the improvement of techniques for the detailed analysis, experimental measurement and numerical simulation of flows confined within complex geometry. Interrogation algorithms…
(more)
▼ This thesis deals with the improvement of techniques for the detailed analysis, experimental measurement and numerical simulation of flows confined within complex geometry. Interrogation algorithms for time resolved PIV were designed and implemented. Special attention was given to the treatment of the near wall portions of the images to ensure appropriate resolution of the boundary layer by proper placement of the displacement vector when the interrogation area overlaps the image boundary. A 3D
finite volume solver for the Navier Stokes equations was created. This numerical model works with block structured grids and sliding interfaces, allowing the treatment of rather complex geometries. This solver has been fully parallelised using OpenMP. The set of techniques was completed devising a novel conditional sampling method based on fuzzy clustering for the analysis of large scale dynamics in turbulent flows. A set of ensemble averages is produced and the time evolution of the flow can be analysed through the most probable sequence in time of the conditionally sampled averages. A case study was selected to drive the evolution of these techniques, concerning the flow inside a printed circuit board (PCB) enclosure. Keywords: PIV,
Finite Volume, Fuzzy Clustering, confined flows
Advisors/Committee Members: [email protected] (authoremail), true (authoremailshow), Vernet Peña, Anton (director), Ferré i Vidal, Josep A. (codirector).
Subjects/Keywords: complex geometry; finite volume; time resolved PIV; Fuzzy clustering; 004; 62
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APA (6th Edition):
Usera Velasco, G. (2009). Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry. (Thesis). Universitat Rovira i Virgili. Retrieved from http://hdl.handle.net/10803/8495
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Usera Velasco, Gabriel. “Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry.” 2009. Thesis, Universitat Rovira i Virgili. Accessed November 17, 2019.
http://hdl.handle.net/10803/8495.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Usera Velasco, Gabriel. “Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry.” 2009. Web. 17 Nov 2019.
Vancouver:
Usera Velasco G. Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry. [Internet] [Thesis]. Universitat Rovira i Virgili; 2009. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10803/8495.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Usera Velasco G. Improvements in full field techniques for the measurement, simulation and analysis of confined flows in complex geometry. [Thesis]. Universitat Rovira i Virgili; 2009. Available from: http://hdl.handle.net/10803/8495
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
26.
Phillips, Tyrone.
Extrapolation-based Discretization Error and Uncertainty Estimation in Computational Fluid Dynamics.
Degree: MS, Aerospace and Ocean Engineering, 2012, Virginia Tech
URL: http://hdl.handle.net/10919/31504
► The solution to partial differential equations generally requires approximations that result in numerical error in the final solution. Of the different types of numerical error…
(more)
▼ The solution to partial differential equations generally requires approximations that result in numerical error in the final solution. Of the different types of numerical error in a solution, discretization error is the largest and most difficult error to estimate. In addition, the accuracy of the discretization error estimates relies on the solution (or multiple solutions used in the estimate) being in the asymptotic range. The asymptotic range is used to describe the convergence of a solution, where an asymptotic solution approaches the exact solution at a rate proportional to the change in mesh spacing to an exponent equal to the formal order of accuracy. A non-asymptotic solution can result in unpredictable convergence rates introducing uncertainty in discretization error estimates. To account for the additional uncertainty, various discretization uncertainty estimators have been developed.
The goal of this work is to evaluation discretization error and discretization uncertainty estimators based on Richardson extrapolation for computational fluid dynamics problems. In order to evaluate the estimators, the exact solution should be known. A select set of solutions to the 2D Euler equations with known exact solutions are used to evaluate the estimators. Since exact solutions are only available for trivial cases, two applications are also used to evaluate the estimators which are solutions to the Navier-Stokes equations: a laminar flat plate and a turbulent flat plate using the k-Ï SST turbulence model. Since the exact solutions to the Navier-Stokes equations for these cases are unknown, numerical benchmarks are created which are solutions on significantly finer meshes than the solutions used to estimate the discretization error and uncertainty. Metrics are developed to evaluate the accuracy of the error and uncertainty estimates and to study the behavior of each estimator when the solutions are in, near, and far from the asymptotic range.
Based on the results, general recommendations are made for the implementation of the error and uncertainty estimators. In addition, a new uncertainty estimator is proposed with the goal of combining the favorable attributes of the discretization error and uncertainty estimators evaluated. The new estimator is evaluated using numerical solutions which were not used for development and shows improved accuracy over the evaluated estimators.
Advisors/Committee Members: Roy, Christopher John (committeechair), Cliff, Eugene M. (committee member), Mason, William H. (committee member), Tafti, Danesh K. (committee member).
Subjects/Keywords: Richardson Extrapolation; Navier-Stokes; Grid Convergence Index; Finite Volume Method; Euler
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APA ·
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APA (6th Edition):
Phillips, T. (2012). Extrapolation-based Discretization Error and Uncertainty Estimation in Computational Fluid Dynamics. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31504
Chicago Manual of Style (16th Edition):
Phillips, Tyrone. “Extrapolation-based Discretization Error and Uncertainty Estimation in Computational Fluid Dynamics.” 2012. Masters Thesis, Virginia Tech. Accessed November 17, 2019.
http://hdl.handle.net/10919/31504.
MLA Handbook (7th Edition):
Phillips, Tyrone. “Extrapolation-based Discretization Error and Uncertainty Estimation in Computational Fluid Dynamics.” 2012. Web. 17 Nov 2019.
Vancouver:
Phillips T. Extrapolation-based Discretization Error and Uncertainty Estimation in Computational Fluid Dynamics. [Internet] [Masters thesis]. Virginia Tech; 2012. [cited 2019 Nov 17].
Available from: http://hdl.handle.net/10919/31504.
Council of Science Editors:
Phillips T. Extrapolation-based Discretization Error and Uncertainty Estimation in Computational Fluid Dynamics. [Masters Thesis]. Virginia Tech; 2012. Available from: http://hdl.handle.net/10919/31504
Hong Kong University of Science and Technology
27.
Mesgari Sohani, Sara CIVL.
A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods.
Degree: 2015, Hong Kong University of Science and Technology
URL: http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html
► Planned transient waves can be beneficially used in the detection of defects in pipelines. Such applications show that the higher is the frequency of the…
(more)
▼ Planned transient waves can be beneficially used in the detection of defects in pipelines. Such applications show that the higher is the frequency of the injected wave the better is the detection. Finite volume (FV) methods have recently been applied to waterhammer problems and are known to be well suited for high frequency waves. However, FV methods are formulated for simple boundary conditions such no-flux or no-slip, but not for typical boundary conditions in pressurized pipeline systems (e.g., junctions, control valves, orifices, tanks, and reservoirs). In the instances in the literature where FV has been applied to waterhammer problems, the approach has been to use FV for internal sections and the Method of Characteristics (MOC) at the boundaries. This global order of accuracy of the FV-MOC is governed by the MOC solution. This thesis is a first attempt in handling boundary conditions within the FV framework. The approach places the boundary element within a FV to enforce mass and momentum conservation within this volume. The fluxes between the FV and the adjacent elements are then formulated in the usual manner. The approach is illustrated for the case of a valve, a reservoir and a junction. The finite volume method used is the Boltzmann-type scheme, which is a mesoscopic model. In particular, the 1st and 2nd-order collisionless Boltzmann-type scheme (i.e., the kinetic flux vector splitting (KFVS)) and the 2nd-order Bhatnagar-Gross-Krook (BGK) Boltzmann scheme are formulated and applied to one-dimensional transient flows. The accuracy and efficiency of all schemes with the proposed non-iterative FV formulation of the boundary conditions are demonstrated through the following test cases: (i) problems due to sudden closing of a valve, (ii) wave interactions with a junction boundary characterized by a geometric discontinuity, (iii) wave interactions with a junction boundary characterized by a discontinuity in the value of wave speed, and (iv) wave interactions with a junction characterized by a flow rate discontinuity. The pure FV formulation guarantees the mass and momentum conservation. The Boltzmann-based FV schemes capture the discontinuity as well as wave interaction with boundary elements accurately. The stability of the proposed FV schemes is satisfied when Cr < 0:5. The comparison between the efficiency of the conventional scheme (i.e., the Fix- MOC and Godunov schemes) and those of the mesoscopic-based schemes (i.e., the KFVS and BGK schemes) reveals that none of the proposed schemes is better than the 2nd-order Godunov scheme for classical waterhammer. Nevertheless, it is found that the CPU time needed by the 2nd-order BGK scheme to achieve a predefined degree of accuracy is not too far from that by the 2nd-order Godunov scheme. The KFVS scheme is more dissipative than the BGK scheme due to the lack of particle collisions in the formulation.
Subjects/Keywords: Water hammer; Mathematical models; Finite volume method; Lattice Boltzmann methods
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APA ·
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APA (6th Edition):
Mesgari Sohani, S. C. (2015). A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mesgari Sohani, Sara CIVL. “A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods.” 2015. Thesis, Hong Kong University of Science and Technology. Accessed November 17, 2019.
http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mesgari Sohani, Sara CIVL. “A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods.” 2015. Web. 17 Nov 2019.
Vancouver:
Mesgari Sohani SC. A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2015. [cited 2019 Nov 17].
Available from: http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mesgari Sohani SC. A framework for handling boundary conditions in waterhammer within Boltzmann-based finite volume methods. [Thesis]. Hong Kong University of Science and Technology; 2015. Available from: http://repository.ust.hk/ir/bitstream/1783.1-94661/1/th_redirect.html
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Loughborough University
28.
Shahmohamadi, Hamed.
Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions.
Degree: PhD, 2015, Loughborough University
URL: https://dspace.lboro.ac.uk/2134/18460
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756459
► The main aim of this research was to investigate the mechanism of cavitation in conforming and partially conforming tribological conjunctions. The effect of cavitation on…
(more)
▼ The main aim of this research was to investigate the mechanism of cavitation in conforming and partially conforming tribological conjunctions. The effect of cavitation on load carrying capacity and frictional performance of is also investigated. This is important with regards to fuel efficiency in internal combustion (IC) engines. Friction accounts for 15–20% of IC engine losses. The piston–cylinder system contributes to 40–50% of these, with the compression ring(s) being responsible for most of this. This is because the primary function of the ring is to seal the combustion chamber, thus small emerging gaps lead to increased friction. In fact, compression ring(s) expend 3–5% of engine input fuel energy. The share of frictional losses of engine bearings is approximately 20–25%. Traditionally, prediction of performance of tribological conjunctions has been studied using Reynolds equation. When the effect of cavitation is considered, various cavitation algorithms with associated boundary conditions for lubricant rupture and reformation are proposed. These include Elrod, and Elrod and Coyne algorithms, as well as boundary conditions such as Swift-Stieber, JFO and Prandtl-Hopkins. There are a number of assumptions embodied in these approaches, as well as the use of Reynolds equation itself. These approaches do not uphold the continuity of mass and momentum in multi-phase flow, in cavitation beyond the lubricant film rupture. A detailed methodology for multi-phase flow, comprising simultaneous solution of Navier-Stokes, energy and lubricant rheological state equations is developed.
Subjects/Keywords: Finite volume CFD; Multi-phase flow; Cavitation; Tribological conjunctions; Friction
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APA ·
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Export
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APA (6th Edition):
Shahmohamadi, H. (2015). Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/18460 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756459
Chicago Manual of Style (16th Edition):
Shahmohamadi, Hamed. “Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions.” 2015. Doctoral Dissertation, Loughborough University. Accessed November 17, 2019.
https://dspace.lboro.ac.uk/2134/18460 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756459.
MLA Handbook (7th Edition):
Shahmohamadi, Hamed. “Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions.” 2015. Web. 17 Nov 2019.
Vancouver:
Shahmohamadi H. Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions. [Internet] [Doctoral dissertation]. Loughborough University; 2015. [cited 2019 Nov 17].
Available from: https://dspace.lboro.ac.uk/2134/18460 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756459.
Council of Science Editors:
Shahmohamadi H. Multi-phase thermal cavitation flow in rough conforming and partially conforming conjunctions. [Doctoral Dissertation]. Loughborough University; 2015. Available from: https://dspace.lboro.ac.uk/2134/18460 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.756459
29.
Lamine, Mohamed Sadok.
Multi-dimensional higher resolution methods for flow in porous media.
Degree: PhD, 2009, Swansea University
URL: https://cronfa.swan.ac.uk/Record/cronfa42721
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531434
► Currently standard first order single-point upstream weighting methods are employed in reservoir simulation for integrating the essentially hyperbolic system components. These methods introduce both coordinate-line…
(more)
▼ Currently standard first order single-point upstream weighting methods are employed in reservoir simulation for integrating the essentially hyperbolic system components. These methods introduce both coordinate-line numerical diffusion (even in 1-D) and cross-wind diffusion into the solution that is grid and geometry dependent. These effects are particularly important when steep fronts and shocks are present and for cases where flow is across grid coordinate lines. In this thesis, families of novel edge-based and cell-based truly multidimensional upwind formulations that upwind in the direction of the wave paths in order to minimise crosswind diffusion are presented for hyperbolic conservation laws on structured and unstructured triangular and quadrilateral grids in two dimensions. Higher resolution as well as higher order multidimensional formulations are also developed for general structured and unstructured grids. The schemes are coupled with existing consistent and efficient continuous CVD (MPFA) Darcy flux approximations. They are formulated using an IMPES (Implicit in Pressure Explicit in Saturation) strategy for solving the coupled elliptic (pressure) and hyperbolic (saturation) system of equations governing the multi-phase multi-component flow in porous media. The new methods are compared with single point upstream weighting for two-phase and three-component two-phase flow problems. The tests arc conducted on both structured and unstructured grids and involve full-tensor coefficient velocity fields in homogeneous and heterogeneous domains. The comparisons demonstrate the benefits of multidimensional and higher order multidimensional schemes in terms of improved front resolution together with significant reduction in cross-wind diffusion.
Subjects/Keywords: 622; Fluid dynamics; Porosity; Finite volume method; Petroleum reservoirs
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APA ·
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Export
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Manager
APA (6th Edition):
Lamine, M. S. (2009). Multi-dimensional higher resolution methods for flow in porous media. (Doctoral Dissertation). Swansea University. Retrieved from https://cronfa.swan.ac.uk/Record/cronfa42721 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531434
Chicago Manual of Style (16th Edition):
Lamine, Mohamed Sadok. “Multi-dimensional higher resolution methods for flow in porous media.” 2009. Doctoral Dissertation, Swansea University. Accessed November 17, 2019.
https://cronfa.swan.ac.uk/Record/cronfa42721 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531434.
MLA Handbook (7th Edition):
Lamine, Mohamed Sadok. “Multi-dimensional higher resolution methods for flow in porous media.” 2009. Web. 17 Nov 2019.
Vancouver:
Lamine MS. Multi-dimensional higher resolution methods for flow in porous media. [Internet] [Doctoral dissertation]. Swansea University; 2009. [cited 2019 Nov 17].
Available from: https://cronfa.swan.ac.uk/Record/cronfa42721 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531434.
Council of Science Editors:
Lamine MS. Multi-dimensional higher resolution methods for flow in porous media. [Doctoral Dissertation]. Swansea University; 2009. Available from: https://cronfa.swan.ac.uk/Record/cronfa42721 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531434
University of Wollongong
30.
Wanayalage, Chandrasiri Kumara.
Load-deformation behaviour of rough rock fractures subjected to internal water flow.
Degree: PhD, 2014, University of Wollongong
URL: 090501
Civil
Geotechnical
Engineering,
010302
Numerical
Solution
of
Differential
and
Integral
Equations,
0403
GEOLOGY,
0404
GEOPHYSICS
;
https://ro.uow.edu.au/theses/4136
► Underground rock strata are often fractured and their permeability is mainly governed by interconnected fracture networks. Flow through fractures must be studied in order…
(more)
▼ Underground rock strata are often fractured and their permeability is mainly governed by interconnected fracture networks. Flow through fractures must be studied in order to design and operate underground activities such as tunnelling and mine operations, as well as groundwater and petroleum extraction. Flow through a fracture is primarily influenced by its aperture, and because fracture apertures can be distributed widely within a rockmass, they have closures as well as wide openings depending on the location and in-situ stress conditions. Past research studies have been carried out on defining the equivalent aperture to predict fracture flows from uni-directional flow models. However, in most civil engineering applications, plane strain conditions can be assumed (e.g. tunnels, rock slopes), and in such situations two-dimensional fracture models have been suggested for stationary fracture walls. Modelling flow through deformable fractures in plane stain, two-dimensional domain would provide profound insight into rock fracture hydraulics, and these models available now have been simulated using common numerical flow solvers. In this regard, a customised numerical solver to simulate fracture hydraulics would be an important addition to this research area.
In contrast to available literature, in this PhD study, an equivalent twodimensional flow model was derived from the three-dimensional Navier-Stokes theory for deformable rock fractures. The proposed model contains pressure-velocity coupled equations, and a numerical solution is subsequently introduced by modifying the SIMPLE (Semi Implicit Method for Pressure Linked Equations) algorithm. The Writer’s own computer programme (Rock Fracture Flow Solver or RFFS) was developed to solve the proposed model using MATLAB computer language. Laboratory experiments were carried out for mated and dislocated fracture specimens using the high pressure triaxial apparatus (HPTPTA) designed and built in University of Wollongong. The fracture apertures were measured by replicating them and scanning the surfaces using a 3D laser scanner. Flows through the rock fractures were simulated using the Rock Fracture Flow Solver (RFFS), and the validity of the proposed model was verified for general underground fracture flow situations.
Subjects/Keywords: fracture permeability; fluid flow; aperture distribution; triaxial testing; finite volume method
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APA ·
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Export
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APA (6th Edition):
Wanayalage, C. K. (2014). Load-deformation behaviour of rough rock fractures subjected to internal water flow. (Doctoral Dissertation). University of Wollongong. Retrieved from 090501 Civil Geotechnical Engineering, 010302 Numerical Solution of Differential and Integral Equations, 0403 GEOLOGY, 0404 GEOPHYSICS ; https://ro.uow.edu.au/theses/4136
Chicago Manual of Style (16th Edition):
Wanayalage, Chandrasiri Kumara. “Load-deformation behaviour of rough rock fractures subjected to internal water flow.” 2014. Doctoral Dissertation, University of Wollongong. Accessed November 17, 2019.
090501 Civil Geotechnical Engineering, 010302 Numerical Solution of Differential and Integral Equations, 0403 GEOLOGY, 0404 GEOPHYSICS ; https://ro.uow.edu.au/theses/4136.
MLA Handbook (7th Edition):
Wanayalage, Chandrasiri Kumara. “Load-deformation behaviour of rough rock fractures subjected to internal water flow.” 2014. Web. 17 Nov 2019.
Vancouver:
Wanayalage CK. Load-deformation behaviour of rough rock fractures subjected to internal water flow. [Internet] [Doctoral dissertation]. University of Wollongong; 2014. [cited 2019 Nov 17].
Available from: 090501 Civil Geotechnical Engineering, 010302 Numerical Solution of Differential and Integral Equations, 0403 GEOLOGY, 0404 GEOPHYSICS ; https://ro.uow.edu.au/theses/4136.
Council of Science Editors:
Wanayalage CK. Load-deformation behaviour of rough rock fractures subjected to internal water flow. [Doctoral Dissertation]. University of Wollongong; 2014. Available from: 090501 Civil Geotechnical Engineering, 010302 Numerical Solution of Differential and Integral Equations, 0403 GEOLOGY, 0404 GEOPHYSICS ; https://ro.uow.edu.au/theses/4136
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Open Access Theses and Dissertations