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Rice University
1.
Zhang, Yutong.
Computational Flow Analysis of a Cyclone Vacuum Cleaner.
Degree: MS, Mechanical Engineering, 2019, Rice University
URL: http://hdl.handle.net/1911/105403
► Computational flow analysis of a cyclone vacuum cleaner can provide valuable fluid mechanics information for efficient design and operation. The vacuum cleaner is made of…
(more)
▼ Computational flow analysis of a cyclone vacuum cleaner can provide valuable
fluid mechanics information for efficient design and operation. The vacuum cleaner is made of multiple cones, each with a rotational flow field that facilitates the dust collection. Reliable
computational analysis requires both accurate representation of the complex geometry and high-resolution representation of the boundary layers near the internal surfaces of the cones. We address these
computational challenges with the Space–Time Variational Multiscale (ST-VMS) method and isogeometric discretization, using NURBS basis functions. The ST framework has higher-order accuracy in general, and the VMS feature of the ST-VMS addresses the challenge created by the turbulent nature of the flow. The isogeometric discretization provides a more accurate representation of the geometry and increased accuracy in the flow solution. We conduct our studies for both single-cone and multi-cone configurations, and the comparison of the results from the two helps us discern the reasonableness of using single-cone flow analysis in place of full-machine flow analysis.
Advisors/Committee Members: Tezduyar, Tayfun E (advisor).
Subjects/Keywords: Fluid Mechanics; Computational Fluid Mechanics
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APA (6th Edition):
Zhang, Y. (2019). Computational Flow Analysis of a Cyclone Vacuum Cleaner. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/105403
Chicago Manual of Style (16th Edition):
Zhang, Yutong. “Computational Flow Analysis of a Cyclone Vacuum Cleaner.” 2019. Masters Thesis, Rice University. Accessed April 16, 2021.
http://hdl.handle.net/1911/105403.
MLA Handbook (7th Edition):
Zhang, Yutong. “Computational Flow Analysis of a Cyclone Vacuum Cleaner.” 2019. Web. 16 Apr 2021.
Vancouver:
Zhang Y. Computational Flow Analysis of a Cyclone Vacuum Cleaner. [Internet] [Masters thesis]. Rice University; 2019. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1911/105403.
Council of Science Editors:
Zhang Y. Computational Flow Analysis of a Cyclone Vacuum Cleaner. [Masters Thesis]. Rice University; 2019. Available from: http://hdl.handle.net/1911/105403
2.
Nagai, Toshiki.
Space-time Extended Finite Element Method with Applications to Fluid-structure Interaction Problems.
Degree: 2018, University of Colorado at Boulder
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10844711
► This thesis presents a space-time extended finite element method (space-time XFEM) based on the Heaviside enrichment for transient problems with moving interfaces, and its…
(more)
▼ This thesis presents a space-time extended finite element method (space-time XFEM) based on the Heaviside enrichment for transient problems with moving interfaces, and its applications to the fluid-structure interaction (FSI) analysis. The Heaviside-enriched XFEM is a promising method to discretize partial differential equations with discontinuities in space. However, significant approximation errors are introduced by time stepping schemes when the interface geometry changes in time. The proposed space-time XFEM applies the finite element discretization and the Heaviside enrichment in both space and time with elements forming a space-time slab. A simple space-time scheme is introduced to integrate the weak form of the governing equations. This scheme considers spatial intersection configuration at multiple temporal integration points. Standard spatial integration techniques can be applied for each spatial configuration. Nitsche's method and the face-oriented ghost-penalty method are extended to the proposed space-time XFEM formulation. The stability, accuracy and flexibility of the space-time XFEM for various interface conditions including moving interfaces are demonstrated with structural and fluid problems. Moreover, the space-time XFEM enables analyzing complex FSI problems using moving interfaces, such as FSI with contact. Two FSI methods using moving interfaces (full-Eulerian FSI and Lagrangian-immersed FSI) are studied. The Lagrangian-immersed FSI method is a mixed formulation of Lagrangian and Eulerian descriptions. As solid and fluid meshes are independently defined, the FSI is computed between non-matching interfaces based on Nitsche's method and projection techniques adopted from computational contact mechanics. The stabilized Lagrange multiplier method is used for contact. Numerical examples of FSI and FSI-contact problems provide insight into the characteristics of the combination of the space-time XFEM and the Lagrangian-immersed FSI method. The proposed combination is a promising method which has the versatility for various multi-physics simulations and the applicability such as optimization.
Subjects/Keywords: Fluid mechanics; Computational physics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Nagai, T. (2018). Space-time Extended Finite Element Method with Applications to Fluid-structure Interaction Problems. (Thesis). University of Colorado at Boulder. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10844711
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):
Nagai, Toshiki. “Space-time Extended Finite Element Method with Applications to Fluid-structure Interaction Problems.” 2018. Thesis, University of Colorado at Boulder. Accessed April 16, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10844711.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Nagai, Toshiki. “Space-time Extended Finite Element Method with Applications to Fluid-structure Interaction Problems.” 2018. Web. 16 Apr 2021.
Vancouver:
Nagai T. Space-time Extended Finite Element Method with Applications to Fluid-structure Interaction Problems. [Internet] [Thesis]. University of Colorado at Boulder; 2018. [cited 2021 Apr 16].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10844711.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Nagai T. Space-time Extended Finite Element Method with Applications to Fluid-structure Interaction Problems. [Thesis]. University of Colorado at Boulder; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10844711
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University
3.
Labarbera, Nicholas Andrew.
A Comparison of Modeling Approaches of a High Aspect Cylinder in Axial Flow.
Degree: 2015, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/27459
► Simulating a fully-coupled fluid-structure interaction system from first-principles can be very computationally expensive especially for use in design-level analyses; therefore, it is advantageous to explore…
(more)
▼ Simulating a fully-coupled
fluid-structure interaction system from first-principles can be very computationally expensive especially for use in design-level analyses; therefore, it is advantageous to explore less computationally expensive methods. By making assumptions about the relevant physics of the problem, simplifications to the governing equations can be applied. These simplifications result in a reduced-order model that can significantly decrease the
computational cost; however, the governing equations simplifications result in the reduced-order model neglecting to take into account all the physics of the system. Ideally, the neglected physics would have little to no impact on the dynamics of the system; however, this is not always the case for all input parameters. Therefore, it is important to determine the parameter space for which a reduced order model is valid.
In this thesis, numerical simulations of a slender cylinder in axial flow were performed using two different methods. The first is a strongly-coupled
fluid-structure interaction simulation based on first-principles. First-principles for this case is solving the incompressible Navier-Stokes equations for the
fluid and the full equations of elasticity for the solid domain. The second is a reduced-order model for a cylinder in axial flow that was devised by Paidoussis. It consists of a single linear partial differential equation that requires significantly less
computational resources to solve than the non-linear governing equations used in the first-principles model. For certain input parameters, the reduced-order model is capable of predicting stability with comparable accuracy to the first-principles model, but is obtained in a fraction of the time.
The goal of this thesis is to investigate the parameter space for which the less
computational expensive reduced order model can be utilized and for which the more computationally expensive first-principles solver is required. To accomplish the goal, the two models were compared through the variation of input parameters to determine the parameter ranges corresponding to agreement between models. Results are presented and conclusions discussed.
Advisors/Committee Members: Jonathan S Pitt, Thesis Advisor/Co-Advisor.
Subjects/Keywords: fluid-structure; computational mechanics; axial flow
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Labarbera, N. A. (2015). A Comparison of Modeling Approaches of a High Aspect Cylinder in Axial Flow. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/27459
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):
Labarbera, Nicholas Andrew. “A Comparison of Modeling Approaches of a High Aspect Cylinder in Axial Flow.” 2015. Thesis, Penn State University. Accessed April 16, 2021.
https://submit-etda.libraries.psu.edu/catalog/27459.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Labarbera, Nicholas Andrew. “A Comparison of Modeling Approaches of a High Aspect Cylinder in Axial Flow.” 2015. Web. 16 Apr 2021.
Vancouver:
Labarbera NA. A Comparison of Modeling Approaches of a High Aspect Cylinder in Axial Flow. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Apr 16].
Available from: https://submit-etda.libraries.psu.edu/catalog/27459.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Labarbera NA. A Comparison of Modeling Approaches of a High Aspect Cylinder in Axial Flow. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/27459
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
4.
Smith, Katherine Margaret.
Effects of Submesoscale Turbulence on Reactive Tracers in the Upper Ocean.
Degree: 2018, University of Colorado at Boulder
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10623667
► In this dissertation, Large Eddy Simulations (LES) are used to model the coupled turbulence-reactive tracer dynamics within the upper mixed layer of the ocean.…
(more)
▼ In this dissertation, Large Eddy Simulations (LES) are used to model the coupled turbulence-reactive tracer dynamics within the upper mixed layer of the ocean. Prior work has shown that LES works well over the spatial and time scales relevant to both turbulence and reactive biogeochemistry. Additionally, the code intended for use is able to carry an arbitrary number of tracer equations, allowing for easy expansion of the species reactions. Research in this dissertation includes a study of 15 idealized non-reactive tracers within an evolving large-scale temperature front in order determine and understand the fundamental dynamics underlying turbulence-tracer interaction in the absence of reactions. The focus of this study, in particular, was on understanding the evolution of biogeochemically-relevant, non-reactive tracers in the presence of both large (~5 km) submesoscale eddies and smallscale (~100 m) wave-driven Langmuir turbulence. The 15 tracers studied have different initial, boundary, and source conditions and significant differences are seen in their distributions depending on these conditions. Differences are also seen between regions where submesoscale eddies and small-scale Langmuir turbulence are both present, and in regions with only Langmuir turbulence. A second study focuses on the examination of Langmuir turbulence effects on upper ocean carbonate chemistry. Langmuir mixing time scales are similar to those of chemical reactions, resulting in potentially strong tracer-flow coupling effects. The strength of the Langmuir turbulence is varied, from no wave-driven turbulence (i.e., only shear-driven turbulence), to Langmuir turbulence that is much stronger than that found in typical upper ocean conditions. Three different carbonate chemistry models are also used in this study: time-dependent chemistry, equilibrium chemistry, and no-chemistry (i.e., non-reactive tracers). The third and final study described in this dissertation details the development of a reduced-order biogeochemical model with 17 state equations that can accurately reproduce the Bermuda Atlantic Time-series Study (BATS) ecosystem behavior, but that can also be integrated within high-resolution LES.
Subjects/Keywords: Fluid mechanics; Computational physics; Physical oceanography
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smith, K. M. (2018). Effects of Submesoscale Turbulence on Reactive Tracers in the Upper Ocean. (Thesis). University of Colorado at Boulder. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10623667
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):
Smith, Katherine Margaret. “Effects of Submesoscale Turbulence on Reactive Tracers in the Upper Ocean.” 2018. Thesis, University of Colorado at Boulder. Accessed April 16, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10623667.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Katherine Margaret. “Effects of Submesoscale Turbulence on Reactive Tracers in the Upper Ocean.” 2018. Web. 16 Apr 2021.
Vancouver:
Smith KM. Effects of Submesoscale Turbulence on Reactive Tracers in the Upper Ocean. [Internet] [Thesis]. University of Colorado at Boulder; 2018. [cited 2021 Apr 16].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10623667.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith KM. Effects of Submesoscale Turbulence on Reactive Tracers in the Upper Ocean. [Thesis]. University of Colorado at Boulder; 2018. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10623667
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
5.
Capobianco, Vincent J.
Effect of slot height variation on the aerodynamic performance of a circulation control airfoil| A CFD analysis.
Degree: 2017, California State University, Long Beach
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=10639011
► Computational fluid dynamic (CFD) simulations were conducted on a known low aspect ratio wing design as well as four variant designs incorporating Coanda effect…
(more)
▼ Computational fluid dynamic (CFD) simulations were conducted on a known low aspect ratio wing design as well as four variant designs incorporating Coanda effect circulation control (CC) for lift generation. The U.S. Navy’s Kestrel code was employed to explore the relation of slot height and lip thickness to maximize lift augmentation. Reynolds Averaged Navier-Stokes calculations were performed at a Reynolds number of 2.1 million over wing configurations with a 1 ft span and chord with top slot flow blowing coefficients of 0, 0.005, 0.05, 0.1, and 0.15 over the angles of attack of 0°, 4°, 8°, 14°, and 18°. The computational results were compared to experimental measurements of slot unblown and blown configurations. General findings include higher lift augmentation ratios of modified designs with similar lip thickness and larger slot gap. Greater lift coefficients were found with larger lip thicknesses and smaller slot heights.
Subjects/Keywords: Fluid mechanics; Computational physics; Aerospace engineering
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Capobianco, V. J. (2017). Effect of slot height variation on the aerodynamic performance of a circulation control airfoil| A CFD analysis. (Thesis). California State University, Long Beach. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=10639011
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):
Capobianco, Vincent J. “Effect of slot height variation on the aerodynamic performance of a circulation control airfoil| A CFD analysis.” 2017. Thesis, California State University, Long Beach. Accessed April 16, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=10639011.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Capobianco, Vincent J. “Effect of slot height variation on the aerodynamic performance of a circulation control airfoil| A CFD analysis.” 2017. Web. 16 Apr 2021.
Vancouver:
Capobianco VJ. Effect of slot height variation on the aerodynamic performance of a circulation control airfoil| A CFD analysis. [Internet] [Thesis]. California State University, Long Beach; 2017. [cited 2021 Apr 16].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10639011.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Capobianco VJ. Effect of slot height variation on the aerodynamic performance of a circulation control airfoil| A CFD analysis. [Thesis]. California State University, Long Beach; 2017. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=10639011
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Embry-Riddle Aeronautical University
6.
Ravulapati, Kartheek.
Separation Bubbles and Vortex Formation in Cavity Flows.
Degree: MSin Aerospace Engineering, Graduate Studies, 2014, Embry-Riddle Aeronautical University
URL: https://commons.erau.edu/edt/179
► This research is a computational fluid dynamic study of the formation of vortices and separation bubbles in a square cavity as well as in…
(more)
▼ This research is a computational fluid dynamic study of the formation of vortices and separation bubbles in a square cavity as well as in a cylindrical cavity. Whereas there has been previous research work on the problem of a free stream over different types of cavities, like open and closed cavities or lid driven cavities, this research on an inlet induced flow inside a square cavity lead to unusual and interesting basic fluid dynamical phenomena. The flow in a square cavity and in a cylindrical cavity is simulated over a range of Reynolds numbers and the appearance of separation bubbles and vortices have been obtained.
A large separation bubble develops in the vicinity of the left bottom corner for a range of Reynolds numbers from 1 up to about 1700. Once that Reynolds number is reached, the bubble disappears and a new vortical structure appears in the vicinity of the top right position.
Subjects/Keywords: Aerodynamics and Fluid Mechanics; Computational Engineering
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ravulapati, K. (2014). Separation Bubbles and Vortex Formation in Cavity Flows. (Masters Thesis). Embry-Riddle Aeronautical University. Retrieved from https://commons.erau.edu/edt/179
Chicago Manual of Style (16th Edition):
Ravulapati, Kartheek. “Separation Bubbles and Vortex Formation in Cavity Flows.” 2014. Masters Thesis, Embry-Riddle Aeronautical University. Accessed April 16, 2021.
https://commons.erau.edu/edt/179.
MLA Handbook (7th Edition):
Ravulapati, Kartheek. “Separation Bubbles and Vortex Formation in Cavity Flows.” 2014. Web. 16 Apr 2021.
Vancouver:
Ravulapati K. Separation Bubbles and Vortex Formation in Cavity Flows. [Internet] [Masters thesis]. Embry-Riddle Aeronautical University; 2014. [cited 2021 Apr 16].
Available from: https://commons.erau.edu/edt/179.
Council of Science Editors:
Ravulapati K. Separation Bubbles and Vortex Formation in Cavity Flows. [Masters Thesis]. Embry-Riddle Aeronautical University; 2014. Available from: https://commons.erau.edu/edt/179

The George Washington University
7.
Dhruv, Akash.
A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries.
Degree: 2021, The George Washington University
URL: http://pqdtopen.proquest.com/#viewpdf?dispub=28256871
► Complex interactions between solid, liquid and gas occur in many practical engineering applications, and are often difficult to quantify experimentally. A few examples include boiling…
(more)
▼ Complex interactions between solid, liquid and gas occur in many practical engineering applications, and are often difficult to quantify experimentally. A few examples include boiling over solid heaters, solidification melt-dynamics in metal casting, and convective cooling of electronic components. With the availability of scalable computational tools, high-fidelity simulations can provide new insight into these phenomena and answer open questions. In the present work, a multiphase solver is presented which can simulate problems involving phase transition over complex geometries. The dynamics of liquid-gas interface are modeled using a level-set technique, which utilizes Ghost Fluid Method (GFM) to account for sharp jump in pressure, velocity, and temperature across the multiphase boundary. The fluid-solid interactions are modeled using an Immersed Boundary Method (IBM) which uses a Moving Least Squared (MLS) reconstruction to calculate fluid-flow around the solid, along with an additional GFM forcing to model its effect on pressure, temperature and Conjugate Heat Transfer (CHT). The resulting three dimensional solver is fully explicit in time and uses a fractional step method for Navier-Stokes, energy, and mass transfer equations. Validation and verification cases are presented to demonstrate the accuracy of the solver in comparison to experimental and analytical problems, and results of high fidelity pool boiling simulations in varying gravity environments are discussed in detail.
Subjects/Keywords: Fluid mechanics; Computational physics; Mechanical engineering
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dhruv, A. (2021). A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries. (Thesis). The George Washington University. Retrieved from http://pqdtopen.proquest.com/#viewpdf?dispub=28256871
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):
Dhruv, Akash. “A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries.” 2021. Thesis, The George Washington University. Accessed April 16, 2021.
http://pqdtopen.proquest.com/#viewpdf?dispub=28256871.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dhruv, Akash. “A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries.” 2021. Web. 16 Apr 2021.
Vancouver:
Dhruv A. A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries. [Internet] [Thesis]. The George Washington University; 2021. [cited 2021 Apr 16].
Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=28256871.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dhruv A. A Multiphase Solver for High-Fidelity Phase-Change Simulations over Complex Geometries. [Thesis]. The George Washington University; 2021. Available from: http://pqdtopen.proquest.com/#viewpdf?dispub=28256871
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Penn State University
8.
Witmer, Kory P.
In Vitro and Computational Analysis of the Fluid Mechanics Promoting Thrombus Formation in a Backward-facing Step Flow Domain.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/22673
► The continued development of cardiovascular assist devices is constantly thwarted by the effects of thrombosis. Many of these devices produce regions of stagnant flow or…
(more)
▼ The continued development of cardiovascular assist devices is constantly thwarted by the effects of thrombosis. Many of these devices produce regions of stagnant flow or low wall shear stress, making these areas especially prone to clotting. To better understand the process of coagulation in artificial devices, the
fluid mechanics that promote stagnant, recirculating flow are studied using a backward-facing step (BFS) model. Using digital surface reconstructions of 15-minute thrombi from previous studies, model thrombi are constructed from polydimethylsiloxane (PDMS), coated with collagen to act as a procoagulant to promote thrombosis, and inserted into the recirculation region of the BFS model. An in vitro flow loop is constructed and whole bovine blood is used to grow thrombi on the surface and downstream from the PDMS models. Flow loop operation is at 0.76 L/min for run times of 15 and 45 minutes, which when added to the 15-minute model produce thrombi of 30 and 60 minute size, respectively. Volume and surface data of formed thrombi are obtained using magnetic resonance imaging. These thrombi are then removed from the model, paraffin embedded, and analyzed histologically through Carstairs’ staining procedure. Surface reconstructions from MRI data are used for steady,
computational simulations to analyze flow over and wall shear stresses that develop on thrombi surfaces. Particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) are used to characterize the recirculation zone produced by the BFS model and are compared to simulations performed on an empty BFS model. WSS analysis of PDMS models shows high regions of stress near the location of the step where little thrombus deposition occurs. Deposition is observed to occur on the PDMS model where lower WSS values are present. Small vortices are observed over the surface of these downstream PDMS regions, suggesting that recirculation is necessary for thrombosis even on procoagulant surfaces. The average volume and exposed surface area of thrombi formed in the 30 minute experiments were 0.119 cm3 and 1.24 cm2, respectively, and for the 60 minute experiments were 0.189 cm3 and 1.46 cm2, respectively. Volume and exposed surface area for 30 minute studies from previous work were 0.0765 cm3 and 1.18 cm2, respectively, and for 60 minute studies were 0.103 cm3 and 1.44 cm2 for volume and surface area, respectively. The current results yield higher values of volume and exposed surface area than the previous thrombus studies, but showed more repeatability amongst experiments. The increase in volume and surface area could be due to the presence of the collagen procoagulant on the PDMS surface which enhances platelet activation and thrombosis.
Advisors/Committee Members: Keefe B Manning, Thesis Advisor/Co-Advisor.
Subjects/Keywords: thrombosis; fluid mechanics; stagnant flow; coagulation; computational fluid dynamics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Witmer, K. P. (2014). In Vitro and Computational Analysis of the Fluid Mechanics Promoting Thrombus Formation in a Backward-facing Step Flow Domain. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/22673
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):
Witmer, Kory P. “In Vitro and Computational Analysis of the Fluid Mechanics Promoting Thrombus Formation in a Backward-facing Step Flow Domain.” 2014. Thesis, Penn State University. Accessed April 16, 2021.
https://submit-etda.libraries.psu.edu/catalog/22673.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Witmer, Kory P. “In Vitro and Computational Analysis of the Fluid Mechanics Promoting Thrombus Formation in a Backward-facing Step Flow Domain.” 2014. Web. 16 Apr 2021.
Vancouver:
Witmer KP. In Vitro and Computational Analysis of the Fluid Mechanics Promoting Thrombus Formation in a Backward-facing Step Flow Domain. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Apr 16].
Available from: https://submit-etda.libraries.psu.edu/catalog/22673.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Witmer KP. In Vitro and Computational Analysis of the Fluid Mechanics Promoting Thrombus Formation in a Backward-facing Step Flow Domain. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/22673
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Windsor
9.
Shademan, Mehrdad.
CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.
Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2015, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5700
► Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this…
(more)
▼ Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this type of jet. In this thesis a step by step approach has been followed to cover different aspects of impinging jets. In the first step, a steady Reynolds-Averaged Navier-Stokes simulation has been carried out on impinging jets with different nozzle stand-off distances. A strong dependency of the jet characteristics on the nozzle height-to-diameter ratio was observed. The simulations show that an increase in this ratio results in larger shear stress and more distributed pressure on the wall. In the second step, an unsteady simulation using Large Eddy Simulation has been performed on an impinging jet with large stand-off distance. Good agreement was observed between the mean value results obtained from the current simulations and experiments. Unlike impinging jets with small stand-off distance, where the ring-like vortices keep their interconnected shape upon reaching the plate, no sign of interconnection was observed on the plate for the large stand-off distance case. A large deflection of the jet stagnation streamline was observed in comparison to the cases with small nozzle height-to-diameter ratios. Large fluctuations of the unsteady wall shear stresses were also captured. A boiling model was developed for impinging jets with heat transfer. An Eulerian-Eulerian two-phase flow model was implemented using an open source code for the simulation (OpenFOAM). Initially, an adiabatic two-phase model was developed for flow in a pipe. Following this, the energy equation was activated to account for non-adiabatic and boiling conditions. The simulation predictions were found to be in reasonable agreement with the experimental data and show significant improvement over previous numerical results. Finally, the model was upgraded for an impinging jet flow by implementing new correlations. The results obtained from the current model show reasonable agreement with the experimental results. The model can be confidently used for the evaluation of adiabatic and non-adiabatic impinging jet flows.
Advisors/Committee Members: Ronald M Barron, Ramaswami Balachandar.
Subjects/Keywords: computational fluid dynamics; fluid mechanics; impinging jet; turbulence modelling; Mechanical Engineering
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shademan, M. (2015). CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5700
Chicago Manual of Style (16th Edition):
Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.” 2015. Doctoral Dissertation, University of Windsor. Accessed April 16, 2021.
https://scholar.uwindsor.ca/etd/5700.
MLA Handbook (7th Edition):
Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer.” 2015. Web. 16 Apr 2021.
Vancouver:
Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. [Internet] [Doctoral dissertation]. University of Windsor; 2015. [cited 2021 Apr 16].
Available from: https://scholar.uwindsor.ca/etd/5700.
Council of Science Editors:
Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat Transfer. [Doctoral Dissertation]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5700

Georgia Tech
10.
Tang, Tsz Ling Elaine.
EFFECT OF GEOMETRY, RESPIRATION AND VESSEL DEFORMABILITY ON FONTAN HEMODYNAMICS: A NUMERICAL INVESTIGATION.
Degree: PhD, Chemical and Biomolecular Engineering, 2015, Georgia Tech
URL: http://hdl.handle.net/1853/56206
► Single ventricle (SV) congenital heart defects occur in 2 of every 1000 live births in the US. The Fontan procedure, the common palliation of single…
(more)
▼ Single ventricle (SV) congenital heart defects occur in 2 of every 1000 live births in the US. The Fontan procedure, the common palliation of single ventricle heart defect patients, results in the bypass the right ventricle, completing the total cavopulmonary connection (TCPC). Even though this procedure results in favorable short-term outcomes, Fontan patients are subjected to a series of long-term complications, including reduced exercise capacity and life expectancy. The exact causes of these long-term complications are not clear, but some are attributed to the unfavorable hemodynamics in the TCPC. In this thesis, the impact of geometry, respiration-driven flow, and vessel wall deformability on TCPC hemodynamics was evaluated and compared. First, the impact of patient specific geometry was studied by characterizing the patient specific anatomic features of a large patient cohort of TCPCs obtained from cardiac magnetic resonance (CMR) images. Second, the influence of respiratory-driven flow was investigated by comparing TCPC hemodynamics simulated using a vessel flow waveform obtained from both free-breathing and breath-held phase-contrast CMR acquisitions. Third, the effect of wall deformability was studied by comparing TCPC hemodynamics under rigid wall and compliant wall conditions. At the end of this thesis, the impact of patient specific geometry, flow pulsatility, respiration, and wall compliance on TCPC hemodynamics was discussed.
Advisors/Committee Members: Yoganathan, Ajit P (advisor), del Nido, Pedro J (committee member), Veneziani, Alessandro (committee member), McElhinney, Doff B (committee member), Lu, Hang (committee member), Sambanis, Athanassios (committee member).
Subjects/Keywords: Congenital heart disease; Fluid mechanics; Computational fluid dynamics; Pediatric cardiology
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tang, T. L. E. (2015). EFFECT OF GEOMETRY, RESPIRATION AND VESSEL DEFORMABILITY ON FONTAN HEMODYNAMICS: A NUMERICAL INVESTIGATION. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/56206
Chicago Manual of Style (16th Edition):
Tang, Tsz Ling Elaine. “EFFECT OF GEOMETRY, RESPIRATION AND VESSEL DEFORMABILITY ON FONTAN HEMODYNAMICS: A NUMERICAL INVESTIGATION.” 2015. Doctoral Dissertation, Georgia Tech. Accessed April 16, 2021.
http://hdl.handle.net/1853/56206.
MLA Handbook (7th Edition):
Tang, Tsz Ling Elaine. “EFFECT OF GEOMETRY, RESPIRATION AND VESSEL DEFORMABILITY ON FONTAN HEMODYNAMICS: A NUMERICAL INVESTIGATION.” 2015. Web. 16 Apr 2021.
Vancouver:
Tang TLE. EFFECT OF GEOMETRY, RESPIRATION AND VESSEL DEFORMABILITY ON FONTAN HEMODYNAMICS: A NUMERICAL INVESTIGATION. [Internet] [Doctoral dissertation]. Georgia Tech; 2015. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1853/56206.
Council of Science Editors:
Tang TLE. EFFECT OF GEOMETRY, RESPIRATION AND VESSEL DEFORMABILITY ON FONTAN HEMODYNAMICS: A NUMERICAL INVESTIGATION. [Doctoral Dissertation]. Georgia Tech; 2015. Available from: http://hdl.handle.net/1853/56206

Colorado School of Mines
11.
Nguyen, Richard T.
Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models.
Degree: MS(M.S.), Mechanical Engineering, 2016, Colorado School of Mines
URL: http://hdl.handle.net/11124/170151
► Microchannel heat exchanger simulation provides a means to obtain design predictions at low cost and quick turnaround. Using computational fluid dynamics to solve the conjugate…
(more)
▼ Microchannel heat exchanger simulation provides a means to obtain design predictions at low cost and quick turnaround. Using
computational fluid dynamics to solve the conjugate heat transfer problem, key output metrics such as overall pressure drop, heat exchanger effectiveness, and heat exchanger output can be obtained quickly for many different designs. For most microchannel heat exchangers, the problem can be simplified by solving the individual channel flow separately. By substituting plug flow and Poiseuille flow models for the individual channels,
computational efficiency can be improved. This work presents the coupling of plug flow and Poiseuille flow models with ANSYS's
computational fluid dynamics package, FLUENT. The coupling algorithm is implemented between User Defined Functions and boundaries within FLUENT's domains, eliminating the individual channel domain from the
computational domain. Using the simplified model, full heat exchanger designs can be accurately represented with up to a 74% improvement in
computational cost.
Advisors/Committee Members: Kee, R. J. (advisor), Bogin, Gregory E. (committee member), Tilton, Nils (committee member).
Subjects/Keywords: ANSYS fluent; computational fluid dynamics; fluid mechanics; microchannel heat exchanger; modeling
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Nguyen, R. T. (2016). Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models. (Masters Thesis). Colorado School of Mines. Retrieved from http://hdl.handle.net/11124/170151
Chicago Manual of Style (16th Edition):
Nguyen, Richard T. “Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models.” 2016. Masters Thesis, Colorado School of Mines. Accessed April 16, 2021.
http://hdl.handle.net/11124/170151.
MLA Handbook (7th Edition):
Nguyen, Richard T. “Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models.” 2016. Web. 16 Apr 2021.
Vancouver:
Nguyen RT. Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models. [Internet] [Masters thesis]. Colorado School of Mines; 2016. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/11124/170151.
Council of Science Editors:
Nguyen RT. Coupling complex microchannel heat exchanger CFD with plug flow and Poiseuille flow models. [Masters Thesis]. Colorado School of Mines; 2016. Available from: http://hdl.handle.net/11124/170151

University of Windsor
12.
Shademan, Mehrdad.
CFD Simulation of Impinging Jet Flows and Boiling Heat
Transfer.
Degree: PhD, Mechanical, Automotive, and Materials
Engineering, 2015, University of Windsor
URL: http://scholar.uwindsor.ca/etd/5700
► Circular jets impinging vertically on flat surfaces have many practical applications in industry. Nozzle height-to-diameter ratio plays an important role in the performance of this…
(more)
▼ Circular jets impinging vertically on flat
surfaces have many practical applications in industry. Nozzle
height-to-diameter ratio plays an important role in the performance
of this type of jet. In this thesis a step by step approach has
been followed to cover different aspects of impinging jets. In the
first step, a steady Reynolds-Averaged Navier-Stokes simulation has
been carried out on impinging jets with different nozzle stand-off
distances. A strong dependency of the jet characteristics on the
nozzle height-to-diameter ratio was observed. The simulations show
that an increase in this ratio results in larger shear stress and
more distributed pressure on the wall. In the second step, an
unsteady simulation using Large Eddy Simulation has been performed
on an impinging jet with large stand-off distance. Good agreement
was observed between the mean value results obtained from the
current simulations and experiments. Unlike impinging jets with
small stand-off distance, where the ring-like vortices keep their
interconnected shape upon reaching the plate, no sign of
interconnection was observed on the plate for the large stand-off
distance case. A large deflection of the jet stagnation streamline
was observed in comparison to the cases with small nozzle
height-to-diameter ratios. Large fluctuations of the unsteady wall
shear stresses were also captured. A boiling model was developed
for impinging jets with heat transfer. An Eulerian-Eulerian
two-phase flow model was implemented using an open source code for
the simulation (OpenFOAM). Initially, an adiabatic two-phase model
was developed for flow in a pipe. Following this, the energy
equation was activated to account for non-adiabatic and boiling
conditions. The simulation predictions were found to be in
reasonable agreement with the experimental data and show
significant improvement over previous numerical results. Finally,
the model was upgraded for an impinging jet flow by implementing
new correlations. The results obtained from the current model show
reasonable agreement with the experimental results. The model can
be confidently used for the evaluation of adiabatic and
non-adiabatic impinging jet flows.
Advisors/Committee Members: Ronald M Barron, Ramaswami Balachandar.
Subjects/Keywords: computational fluid dynamics; fluid mechanics; impinging jet; turbulence modelling; Mechanical Engineering
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Shademan, M. (2015). CFD Simulation of Impinging Jet Flows and Boiling Heat
Transfer. (Doctoral Dissertation). University of Windsor. Retrieved from http://scholar.uwindsor.ca/etd/5700
Chicago Manual of Style (16th Edition):
Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat
Transfer.” 2015. Doctoral Dissertation, University of Windsor. Accessed April 16, 2021.
http://scholar.uwindsor.ca/etd/5700.
MLA Handbook (7th Edition):
Shademan, Mehrdad. “CFD Simulation of Impinging Jet Flows and Boiling Heat
Transfer.” 2015. Web. 16 Apr 2021.
Vancouver:
Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat
Transfer. [Internet] [Doctoral dissertation]. University of Windsor; 2015. [cited 2021 Apr 16].
Available from: http://scholar.uwindsor.ca/etd/5700.
Council of Science Editors:
Shademan M. CFD Simulation of Impinging Jet Flows and Boiling Heat
Transfer. [Doctoral Dissertation]. University of Windsor; 2015. Available from: http://scholar.uwindsor.ca/etd/5700

University of California – San Diego
13.
Chongsiripinyo, Karu.
Decay of stratified turbulent wakes behind a bluff body.
Degree: Mechanical and Aerospace Engineering, 2019, University of California – San Diego
URL: http://www.escholarship.org/uc/item/4505g7nr
► The dissertation investigates buoyancy effects in turbulent bluff-body wakes that evolve in stratified fluids. The investigation utilizes high-resolution numerical simulations and employs a body-inclusive approach…
(more)
▼ The dissertation investigates buoyancy effects in turbulent bluff-body wakes that evolve in stratified fluids. The investigation utilizes high-resolution numerical simulations and employs a body-inclusive approach to describe the flow from the body into the far wake unlike the usual temporal-model approximation of most prior stratified-wake simulations. The dissertation is composed of three main parts. The first part focuses on the dynamics of vorticity that accounts for the unexpected regeneration and increase of turbulence in the near-to-intermediate wake when stratification increases in the regime of low body Froude numbers. The second part characterizes buoyancy effects on the evolution of turbulent kinetic energy in a sphere wake at moderate Froude number and an intermediate Reynolds number. The third part concerns the decay of a disk wake at relatively high Reynolds number and a wide range of Froude numbers, constitutes the major contribution of this thesis, and is summarized below.Large-eddy simulations (LES) of flow past a disk are performed at Re = UbLb/ν = 50,000 and at Fr = Ub/NLb = ∞,50,10,2; Ub is the free-stream velocity, Lb is the disk diameter, ν is the fluid kinematic viscosity, and N is the buoyancy frequency.In the axisymmetric wake in a homogeneous fluid, it is found that the mean streamwise velocity deficit (U0) decays in two stages; U0 ∝ x−0.9 during 10 < x/Lb < 65 followed by U0 ∝∼ x−2/3. Consequently, none of the simulated stratified wakes is able to exhibit the classical 2/3 decay exponent of U0 in the interval before buoyancy effects set in. The turbulent characteristic velocity, taken as K1/2 with K the turbulent kinetic energy (TKE), satisfies K1/2 ∝∼ x−2/3 after x/Lb ≈ 10. Turbulent wakes are affected by stratification within approximately one buoyancy time scale (Ntb ≈ 1) after which, provided that RehFrh2 ≥ 1, we find 3 regimes: weakly stratified turbulence (WST), intermediately stratified turbulence (IST), and strongly stratified turbulence (SST). The regime boundaries are delineated by the turbulent horizontal Froude number Frh = u′h/NLHk; here, u′h and LHk are r.m.s horizontal velocity and TKE- based horizontal wake width. WST begins when Frh decreases to O(1), spans 1 < Ntb < 5 and, while the mean flow is strongly affected by buoyancy in WST, turbulence is not. Thus, while the mean flow transitions into the so-called non-equilibrium (NEQ) regime, turbulence remains approximately isotropic in WST. The next stage of IST, identified by progressively increasing turbulence anisotropy, commences at N tb ≈ 5 once F rh decreases to O(0.1). During IST, the mean flow has arrived into the NEQ regime with a constant decay exponent, U0 ∝ x−0.18, but turbulence is still in transition. The exponent of 0.18 for the disk wake is smaller than the approximately 0.25 exponent found for the stratified sphere wake. When F rh decreases by another order of magnitude to F rh ∼ O(0.01), the wake transitions into the third regime of SST that is identified based on the asymptote of turbulent vertical Froude…
Subjects/Keywords: Fluid mechanics; Computational Fluid Dynamics; Decay; Scaling; Stratification; Turbulence; Wake
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chongsiripinyo, K. (2019). Decay of stratified turbulent wakes behind a bluff body. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/4505g7nr
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):
Chongsiripinyo, Karu. “Decay of stratified turbulent wakes behind a bluff body.” 2019. Thesis, University of California – San Diego. Accessed April 16, 2021.
http://www.escholarship.org/uc/item/4505g7nr.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chongsiripinyo, Karu. “Decay of stratified turbulent wakes behind a bluff body.” 2019. Web. 16 Apr 2021.
Vancouver:
Chongsiripinyo K. Decay of stratified turbulent wakes behind a bluff body. [Internet] [Thesis]. University of California – San Diego; 2019. [cited 2021 Apr 16].
Available from: http://www.escholarship.org/uc/item/4505g7nr.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chongsiripinyo K. Decay of stratified turbulent wakes behind a bluff body. [Thesis]. University of California – San Diego; 2019. Available from: http://www.escholarship.org/uc/item/4505g7nr
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Colorado
14.
Culp, David B.
Numerical Coupling of Fracture and Fluid Pressure Using a Phase-Field Model with Applications in Geomechanics.
Degree: MS, 2018, University of Colorado
URL: https://scholar.colorado.edu/cven_gradetds/362
► The application of fracture mechanics is an increasingly important topic in fields including geophysics, geomechanics, materials engineering, structural mechanics and engineering design. The initiation and…
(more)
▼ The application of fracture
mechanics is an increasingly important topic in fields including geophysics, geomechanics, materials engineering, structural
mechanics and engineering design. The initiation and evolution of fractures in porous media often gives rise to discontinuous fields within
computational problems. We compute the crack's aperture, or crack opening, by making use of the gradient of the phase-field in the damaged area. This is useful for determining the material's
fluid-mechanical properties, such as the estimation of Poiseuille-type flow that occurs within a sufficiently damaged medium. Using this approach, it can be shown that the evolution of such fractures in a porous medium can contribute to the material's
fluid flow characteristics, giving rise to a coupled model of
fluid flow and damage within a porous solid. Using the Sierra
Mechanics code suite at Sandia National Laboratories, a phase-field model of fracture is developed which will allow a loose, two-way coupling of these physics for future implementations. We find the model's ability to predict fractures initiated and propagated by introducing
fluid mass to be consistent with analytical solutions. We also find that the crack openings calculated with this model will be helpful for implementing Poiseuille flow along fractures which is a valuable feature in geomechanics modeling.
Advisors/Committee Members: Mija Hubler, Richard Regueiro, Jeong-Hoon Song.
Subjects/Keywords: coupled; phase-field; pressure; mechanics; fluid; Aerodynamics and Fluid Mechanics; Computational Engineering; Physics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Culp, D. B. (2018). Numerical Coupling of Fracture and Fluid Pressure Using a Phase-Field Model with Applications in Geomechanics. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/cven_gradetds/362
Chicago Manual of Style (16th Edition):
Culp, David B. “Numerical Coupling of Fracture and Fluid Pressure Using a Phase-Field Model with Applications in Geomechanics.” 2018. Masters Thesis, University of Colorado. Accessed April 16, 2021.
https://scholar.colorado.edu/cven_gradetds/362.
MLA Handbook (7th Edition):
Culp, David B. “Numerical Coupling of Fracture and Fluid Pressure Using a Phase-Field Model with Applications in Geomechanics.” 2018. Web. 16 Apr 2021.
Vancouver:
Culp DB. Numerical Coupling of Fracture and Fluid Pressure Using a Phase-Field Model with Applications in Geomechanics. [Internet] [Masters thesis]. University of Colorado; 2018. [cited 2021 Apr 16].
Available from: https://scholar.colorado.edu/cven_gradetds/362.
Council of Science Editors:
Culp DB. Numerical Coupling of Fracture and Fluid Pressure Using a Phase-Field Model with Applications in Geomechanics. [Masters Thesis]. University of Colorado; 2018. Available from: https://scholar.colorado.edu/cven_gradetds/362
15.
Bågholt, Christoffer.
CFD Analysis of Heat Transfer in an Innovative Facade System.
Degree: Engineering Sciences and Mathematics, 2018, Luleå University of Technology
URL: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67357
► New innovative façade systems that are well thought out, rational, sustainable and energy efficient are needed for renovation of old buildings to drastically reduce…
(more)
▼ New innovative façade systems that are well thought out, rational, sustainable and energy efficient are needed for renovation of old buildings to drastically reduce the heat losses through walls and to improve indoor conditions. In order to achieve the above mentioned goal, new innovative modular systems that can be mounted on site with ease are an interesting alternative. The system can reduce heat losses dramatically while a ventilated air gap can make the adjacent wall less susceptible to damages caused by moisture. In this work heat transfer analysis in a vertical insulating air cavity is investigated and validated with experiments. The thesis work aims to bring new innovate design tools as well as methodology in the field of advanced Computational Fluid Dynamics (CFD) technology. Transient methods have together with an appropriate turbulence model been applied and a commercial finite volume code has been used to predict the complex mode of heat transfer due to the difference in density in the flow field. i.e ‘Natural Convection’.
Subjects/Keywords: Computational Fluid Mechanics; Heat Transfer; Building Physics; Fluid Mechanics and Acoustics; Strömningsmekanik och akustik
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Bågholt, C. (2018). CFD Analysis of Heat Transfer in an Innovative Facade System. (Thesis). Luleå University of Technology. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67357
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):
Bågholt, Christoffer. “CFD Analysis of Heat Transfer in an Innovative Facade System.” 2018. Thesis, Luleå University of Technology. Accessed April 16, 2021.
http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67357.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bågholt, Christoffer. “CFD Analysis of Heat Transfer in an Innovative Facade System.” 2018. Web. 16 Apr 2021.
Vancouver:
Bågholt C. CFD Analysis of Heat Transfer in an Innovative Facade System. [Internet] [Thesis]. Luleå University of Technology; 2018. [cited 2021 Apr 16].
Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67357.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bågholt C. CFD Analysis of Heat Transfer in an Innovative Facade System. [Thesis]. Luleå University of Technology; 2018. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-67357
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Washington
16.
Dodd, Michael.
Direct numerical simulation of droplet-laden isotropic turbulence.
Degree: PhD, 2017, University of Washington
URL: http://hdl.handle.net/1773/40466
► Interaction of liquid droplets with turbulence is important in numerous applications ranging from rain formation to oil spills to spray combustion. The physical mechanisms of…
(more)
▼ Interaction of liquid droplets with turbulence is important in numerous applications ranging from rain formation to oil spills to spray combustion. The physical mechanisms of droplet-turbulence interaction are largely unknown, especially when compared to that of solid particles. Compared to solid particles, droplets can deform, break up, coalesce and have internal
fluid circulation. The main goal of this work is to investigate using direct numerical simulation (DNS) the physical mechanisms of droplet-turbulence interaction, both for non-evaporating and evaporating droplets. To achieve this objective, we develop and couple a new pressure-correction method with the volume-of-
fluid (VoF) method for simulating incompressible two-
fluid flows. The method's main advantage is that the variable coefficient Poisson equation that arises in solving the incompressible Navier-Stokes equations for two-
fluid flows is reduced to a constant coefficient equation. This equation can then be solved directly using, e.g., the FFT-based parallel Poisson solver. For a 1024
3 mesh, our new pressure-correction method using a fast Poisson solver is ten to forty times faster than the standard pressure-correction method using multigrid. Using the coupled pressure-correction and VoF method, we perform direct numerical simulations (DNS) of 3130 finite-size, non-evaporating droplets of diameter approximately equal to the Taylor lengthscale and with 5~% droplet volume fraction in decaying isotropic turbulence at initial Taylor-scale Reynolds number \Rey_λ=83. In the droplet-laden cases, we vary one of the following three parameters: the droplet Weber number based on the r.m.s. velocity of turbulence (0.1 ≤ \Webrms ≤ 5), the droplet- to carrier-
fluid density ratio (1 ≤ ρ
d/ρ
c ≤ 100) or the droplet- to carrier-
fluid viscosity ratio (1 ≤ μ
d/μ
c ≤ 100). We derive the turbulence kinetic energy (TKE) equations for the two-
fluid, carrier-
fluid and droplet-
fluid flow. These equations allow us to explain the pathways for TKE exchange between the carrier turbulent flow and the flow inside the droplet. We also explain the role of the interfacial surface energy in the two-
fluid TKE equation through work performed by surface tension. Furthermore, we derive the relationship between the power of surface tension and the rate of change of total droplet surface area. This link allows us to explain how droplet deformation, breakup and coalescence play roles in the temporal evolution of TKE. We then extend the code for non-evaporating droplets and develop a combined VoF method and low-Mach-number approach to simulate evaporating and condensing droplets. The two main novelties of the method are: (i) the VOF algorithm captures the motion of the liquid gas interface in the presence of mass transfer due to evaporation and condensation without requiring a projection step for the liquid velocity, and (ii) the low-Mach-number approach allows for local volume changes caused by phase change while the total volume of the liquid-gas…
Advisors/Committee Members: Ferrante, Antonino (advisor).
Subjects/Keywords: droplets; fluid mechanics; multiphase flows; turbulence; Fluid mechanics; Computational physics; Mechanical engineering; Aeronautics and astronautics
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dodd, M. (2017). Direct numerical simulation of droplet-laden isotropic turbulence. (Doctoral Dissertation). University of Washington. Retrieved from http://hdl.handle.net/1773/40466
Chicago Manual of Style (16th Edition):
Dodd, Michael. “Direct numerical simulation of droplet-laden isotropic turbulence.” 2017. Doctoral Dissertation, University of Washington. Accessed April 16, 2021.
http://hdl.handle.net/1773/40466.
MLA Handbook (7th Edition):
Dodd, Michael. “Direct numerical simulation of droplet-laden isotropic turbulence.” 2017. Web. 16 Apr 2021.
Vancouver:
Dodd M. Direct numerical simulation of droplet-laden isotropic turbulence. [Internet] [Doctoral dissertation]. University of Washington; 2017. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1773/40466.
Council of Science Editors:
Dodd M. Direct numerical simulation of droplet-laden isotropic turbulence. [Doctoral Dissertation]. University of Washington; 2017. Available from: http://hdl.handle.net/1773/40466
17.
Mallone, Kevin Charles.
A more robust wall model for use with the two-equation turbulence model.
Degree: PhD, 1995, University of Hertfordshire
URL: http://hdl.handle.net/2299/14149
► The applicability of computational fluid dynamics (CFD) modelling schemes to turbulent wall-bounded flows is a matter of concern. In the near-wall region of bounded flows,…
(more)
▼ The applicability of computational fluid dynamics (CFD) modelling schemes to turbulent wall-bounded flows is a matter of concern. In the near-wall region of bounded flows, the standard high Reynolds number k-e model is not valid and requires the use of empirical wall models to mimic the behaviour of this region. A theoretical study of the physics of prevalent wall modelling techniques showed that the velocity distribution took no account of the pressure gradient. To determine the effect of this shortcoming, a typical transient three-dimensional flow was analysed using current CFD methods and the results compared with experimental flow measurements. Consideration of these results showed that the 'traditional' wall model was unable to replicate observed flow features in the near-wall region: further analysis of the computational results confirmed that these poor flow predictions arose from the inability of the model to consider local pressure gradient effects. Consequently, a strong case was made for a more robust wall model for use in conjunction with the standard high Reynolds number k-e model. A number of boundary layer analyses were reviewed and Coles' law of the wake (1956) presented as a viable candidate for the development of a new wall modelling scheme. In theory, Coles' law (1956) provides a description of bounded flows under arbitrary pressure gradients up to the point of near-separation and may be extended to the study of reversed flows. A generic algorithm for Coles' law was prepared and used to study the fundamental test cases of U-bend and backward facing step flows. In a comparison between documented experimentation, 'conventional' CFD modelling and Coles' law models of these flows, the Coles' law model was shown to provide a viable alternative to 'traditional' schemes. Consequently, the Coles' law model of the near-wall region, being valid for pressure-driven flows, offers an extension to the range of flows for which the standard high Reynolds number k-e model may be used.
Subjects/Keywords: 532; Computational fluid mechanics, Fluid mechanics
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Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Mallone, K. C. (1995). A more robust wall model for use with the two-equation turbulence model. (Doctoral Dissertation). University of Hertfordshire. Retrieved from http://hdl.handle.net/2299/14149
Chicago Manual of Style (16th Edition):
Mallone, Kevin Charles. “A more robust wall model for use with the two-equation turbulence model.” 1995. Doctoral Dissertation, University of Hertfordshire. Accessed April 16, 2021.
http://hdl.handle.net/2299/14149.
MLA Handbook (7th Edition):
Mallone, Kevin Charles. “A more robust wall model for use with the two-equation turbulence model.” 1995. Web. 16 Apr 2021.
Vancouver:
Mallone KC. A more robust wall model for use with the two-equation turbulence model. [Internet] [Doctoral dissertation]. University of Hertfordshire; 1995. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/2299/14149.
Council of Science Editors:
Mallone KC. A more robust wall model for use with the two-equation turbulence model. [Doctoral Dissertation]. University of Hertfordshire; 1995. Available from: http://hdl.handle.net/2299/14149
18.
Zhang, Yutong.
Computational Flow Analysis of a Cyclone Vacuum Cleaner.
Degree: MS, Engineering, 2019, Rice University
URL: http://hdl.handle.net/1911/105402
► Computational flow analysis of a cyclone vacuum cleaner can provide valuable fluid mechanics information for efficient design and operation. The vacuum cleaner is made of…
(more)
▼ Computational flow analysis of a cyclone vacuum cleaner can provide valuable
fluid mechanics information for efficient design and operation. The vacuum cleaner is made of multiple cones, each with a rotational flow field that facilitates the dust collection. Reliable
computational analysis requires both accurate representation of the complex geometry and high-resolution representation of the boundary layers near the internal surfaces of the cones. We address these
computational challenges with the Space–Time Variational Multiscale (ST-VMS) method and isogeometric discretization, using NURBS basis functions. The ST framework has higher-order accuracy in general, and the VMS feature of the ST-VMS addresses the challenge created by the turbulent nature of the flow. The isogeometric discretization provides a more accurate representation of the geometry and increased accuracy in the flow solution. We conduct our studies for both single-cone and multi-cone configurations, and the comparison of the results from the two helps us discern the reasonableness of using single-cone flow analysis in place of full-machine flow analysis.
Advisors/Committee Members: Tezduyar, Tayfun E (advisor).
Subjects/Keywords: Fluid Mechanics; Computational Fluid Mechanics
…and computer simulation.
Our goal is to develop a computational model to simulate the… …computational methods utilized. Chapter 4 covers problem
setup and computation details. Chapter 5… …x28;x) is specified as the initial condition.
3
4
5
Chapter 3
Computational… …2], thermo-fluid analysis of ground vehicles and
their tires [6], thermo… …fluid analysis of disk brakes [41], flow-driven string dynamics
[42], and…
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APA ·
Chicago ·
MLA ·
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CSE |
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APA (6th Edition):
Zhang, Y. (2019). Computational Flow Analysis of a Cyclone Vacuum Cleaner. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/105402
Chicago Manual of Style (16th Edition):
Zhang, Yutong. “Computational Flow Analysis of a Cyclone Vacuum Cleaner.” 2019. Masters Thesis, Rice University. Accessed April 16, 2021.
http://hdl.handle.net/1911/105402.
MLA Handbook (7th Edition):
Zhang, Yutong. “Computational Flow Analysis of a Cyclone Vacuum Cleaner.” 2019. Web. 16 Apr 2021.
Vancouver:
Zhang Y. Computational Flow Analysis of a Cyclone Vacuum Cleaner. [Internet] [Masters thesis]. Rice University; 2019. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1911/105402.
Council of Science Editors:
Zhang Y. Computational Flow Analysis of a Cyclone Vacuum Cleaner. [Masters Thesis]. Rice University; 2019. Available from: http://hdl.handle.net/1911/105402

University of Windsor
19.
Vaselbehagh, Ahmadreza.
Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant.
Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2015, University of Windsor
URL: https://scholar.uwindsor.ca/etd/5493
► The present document is a manuscript-based dissertation covering Ahmadreza Vasel-Be-Hagh's PhD research from September, 2011 to May, 2015. The research was particularly focused on…
(more)
▼ The present document is a manuscript-based dissertation covering Ahmadreza Vasel-Be-Hagh's PhD research from September, 2011 to May, 2015. The research was particularly focused on studying hydrodynamics of underwater accumulators of compressed air for an underwater compressed air energy storage (UWCAES) plant. The accumulator units were floral configurations of droplet-shaped balloons installed close to the bed of deep water. The research was carried out in two major parts: water flow over the balloons and flow produced by the bursting of the balloons. In the first part, three-dimensional simulations were conducted to investigate water flow over accumulators. The simulation was carried out at a free stream Reynolds number of 230,000 using URANS k – omega and LES Dyna – SM turbulence models. The structure of the flow was investigated using iso-surfaces of the second invariant of the velocity gradient and three-dimensional path lines. Several shedding vortex tubes were identified downstream of the balloons. The dynamics of these vortex tubes was further illustrated through time series snapshots containing vorticity lines on two-dimensional planes perpendicular to the flow direction. The frequency of the shedding and the turbulent movements of the vortex tubes were studied through power spectrum analysis of the force coefficients. In the second part, the flow produced by the bursting of balloons was studied experimentally using photographs taken by three cameras with speed of 60 frames per second at a resolution of 1080P. It was observed that if a sufficiently large air-filled balloon quickly burst underwater, a vortex ring bubble was generated. The effect of dimensionless surface tension on general characteristics of the vortex ring bubble including rise velocity, rate of expansion, circulation and trajectory was investigated. It was observed that as the dimensionless surface tension increased, the rise velocity, the circulation and consequently the stability of the vortex ring bubble increased; however, the rate of expansion tends toward constant values. A semi-analytical model was also developed suggesting that the vortex ring expansion is essentially due to the buoyancy force. An expression was also obtained for the circulation in terms of the initial volume of the balloon and the depth at which balloon bursts. Extending from the mentioned semi-analytical model, a perturbation analysis was performed to find an expression for the radius of the buoyant vortex rings. The radius equation includes two terms; the zeroth-order solution representing the effect of buoyancy, and the first-order perturbation correction describing the influence of viscosity. The zeroth-order solution is an explicit function of time; the first-order perturbation modification, however, includes the drag coefficient which is unknown and of interest. Fitting the photographically measured radius into the modified equation yields the time history of the drag coefficient of the corresponding buoyant vortex ring.
Advisors/Committee Members: Ting, David, Carriveau, Rupp.
Subjects/Keywords: CFD; Computational Fluid Dynamics; Experimental Fluid Dynamics; Fluid mechanics; Vortex Dynamics; Vortex Ring
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APA ·
Chicago ·
MLA ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Vaselbehagh, A. (2015). Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5493
Chicago Manual of Style (16th Edition):
Vaselbehagh, Ahmadreza. “Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant.” 2015. Doctoral Dissertation, University of Windsor. Accessed April 16, 2021.
https://scholar.uwindsor.ca/etd/5493.
MLA Handbook (7th Edition):
Vaselbehagh, Ahmadreza. “Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant.” 2015. Web. 16 Apr 2021.
Vancouver:
Vaselbehagh A. Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant. [Internet] [Doctoral dissertation]. University of Windsor; 2015. [cited 2021 Apr 16].
Available from: https://scholar.uwindsor.ca/etd/5493.
Council of Science Editors:
Vaselbehagh A. Hydrodynamics of Accumulators of Compressed Air for an UWCAES Plant. [Doctoral Dissertation]. University of Windsor; 2015. Available from: https://scholar.uwindsor.ca/etd/5493

University of Kentucky
20.
Strodtbeck, Joshua.
A FILTER-FORCING TURBULENCE MODEL FOR LARGE EDDY SIMULATION INCORPORATING THE COMPRESSIBLE "POOR MAN'S" NAVIER – STOKES EQUATIONS.
Degree: 2012, University of Kentucky
URL: https://uknowledge.uky.edu/me_etds/13
► A new approach to large-eddy simulation (LES) based on the use of explicit spatial filtering combined with backscatter forcing is presented. The forcing uses a…
(more)
▼ A new approach to large-eddy simulation (LES) based on the use of explicit spatial filtering combined with backscatter forcing is presented. The forcing uses a discrete dynamical system (DDS) called the compressible ``poor man's'' Navier – Stokes (CPMNS) equations. This DDS is derived from the governing equations and is shown to exhibit good spectral and dynamical properties for use in a turbulence model. An overview and critique of existing turbulence theory and turbulence models is given. A comprehensive theoretical case is presented arguing that traditional LES equations contain unresolved scales in terms generally thought to be resolved, and that this can only be solved with explicit filtering. The CPMNS equations are then incorporated into a simple forcing in the OVERFLOW compressible flow code, and tests are done on homogeneous, isotropic, decaying turbulence, a Mach 3 compression ramp, and a Mach 0.8 open cavity. The numerical results validate the general filter-forcing approach, although they also reveal inadequacies in OVERFLOW and that the current approach is likely too simple to be universally applicable. Two new proposals for constructing better forcing models are presented at the end of the work.
Subjects/Keywords: fluid dynamics; turbulence modeling; computational fluid dynamics; compressible flows; Aerodynamics and Fluid Mechanics
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MLA ·
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APA (6th Edition):
Strodtbeck, J. (2012). A FILTER-FORCING TURBULENCE MODEL FOR LARGE EDDY SIMULATION INCORPORATING THE COMPRESSIBLE "POOR MAN'S" NAVIER – STOKES EQUATIONS. (Doctoral Dissertation). University of Kentucky. Retrieved from https://uknowledge.uky.edu/me_etds/13
Chicago Manual of Style (16th Edition):
Strodtbeck, Joshua. “A FILTER-FORCING TURBULENCE MODEL FOR LARGE EDDY SIMULATION INCORPORATING THE COMPRESSIBLE "POOR MAN'S" NAVIER – STOKES EQUATIONS.” 2012. Doctoral Dissertation, University of Kentucky. Accessed April 16, 2021.
https://uknowledge.uky.edu/me_etds/13.
MLA Handbook (7th Edition):
Strodtbeck, Joshua. “A FILTER-FORCING TURBULENCE MODEL FOR LARGE EDDY SIMULATION INCORPORATING THE COMPRESSIBLE "POOR MAN'S" NAVIER – STOKES EQUATIONS.” 2012. Web. 16 Apr 2021.
Vancouver:
Strodtbeck J. A FILTER-FORCING TURBULENCE MODEL FOR LARGE EDDY SIMULATION INCORPORATING THE COMPRESSIBLE "POOR MAN'S" NAVIER – STOKES EQUATIONS. [Internet] [Doctoral dissertation]. University of Kentucky; 2012. [cited 2021 Apr 16].
Available from: https://uknowledge.uky.edu/me_etds/13.
Council of Science Editors:
Strodtbeck J. A FILTER-FORCING TURBULENCE MODEL FOR LARGE EDDY SIMULATION INCORPORATING THE COMPRESSIBLE "POOR MAN'S" NAVIER – STOKES EQUATIONS. [Doctoral Dissertation]. University of Kentucky; 2012. Available from: https://uknowledge.uky.edu/me_etds/13

Arizona State University
21.
Kedelty, Dominic Sebastian.
A Comparison of Performance between Reconstruction and
Advection Algorithms for Volume-of-Fluid Methods.
Degree: Mechanical Engineering, 2015, Arizona State University
URL: http://repository.asu.edu/items/29784
► The Volume-of-Fluid method is a popular method for interface tracking in Multiphase applications within Computational Fluid Dynamics. To date there exists several algorithms for reconstruction…
(more)
▼ The Volume-of-Fluid method is a popular method for
interface tracking in Multiphase applications within Computational
Fluid Dynamics. To date there exists several algorithms for
reconstruction of a geometric interface surface. Of these are the
Finite Difference algorithm, Least Squares Volume-of-Fluid
Interface Reconstruction Algorithm, LVIRA, and the Efficient Least
Squares Volume-of-Fluid Interface Reconstruction Algorithm, ELVIRA.
Along with these geometric interface reconstruction algorithms,
there exist several volume-of-fluid transportation algorithms. This
paper will discuss two operator-splitting advection algorithms and
an unsplit advection algorithm. Using these three interface
reconstruction algorithms, and three advection algorithms, a
comparison will be drawn to see how different combinations of these
algorithms perform with respect to accuracy as well as
computational expense.
Subjects/Keywords: Mechanical engineering; computational fluid dynamics; fluid mechanics; interface capturing; interface tracking; multiphase; Volume-of-Fluid
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kedelty, D. S. (2015). A Comparison of Performance between Reconstruction and
Advection Algorithms for Volume-of-Fluid Methods. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/29784
Chicago Manual of Style (16th Edition):
Kedelty, Dominic Sebastian. “A Comparison of Performance between Reconstruction and
Advection Algorithms for Volume-of-Fluid Methods.” 2015. Masters Thesis, Arizona State University. Accessed April 16, 2021.
http://repository.asu.edu/items/29784.
MLA Handbook (7th Edition):
Kedelty, Dominic Sebastian. “A Comparison of Performance between Reconstruction and
Advection Algorithms for Volume-of-Fluid Methods.” 2015. Web. 16 Apr 2021.
Vancouver:
Kedelty DS. A Comparison of Performance between Reconstruction and
Advection Algorithms for Volume-of-Fluid Methods. [Internet] [Masters thesis]. Arizona State University; 2015. [cited 2021 Apr 16].
Available from: http://repository.asu.edu/items/29784.
Council of Science Editors:
Kedelty DS. A Comparison of Performance between Reconstruction and
Advection Algorithms for Volume-of-Fluid Methods. [Masters Thesis]. Arizona State University; 2015. Available from: http://repository.asu.edu/items/29784
22.
Cakir, Mustafa.
CFD study on aerodynamic effects of a rear wing/spoiler on a passenger vehicle.
Degree: MS, Mechanical Engineering, 2012, Santa Clara University
URL: https://scholarcommons.scu.edu/mech_mstr/1
► Aerodynamic characteristics of a racing car are of significant interest in reducing car-racing accidents due to wind loading and in reducing the fuel consumption.…
(more)
▼ Aerodynamic characteristics of a racing car are of significant interest in reducing car-racing accidents due to wind loading and in reducing the fuel consumption. At the present, modified car racing becomes more popular around the world. Sports cars are most commonly seen with spoilers, such as Ford Mustang, Subaru Impreza, and Chevrolet Corvette. Even though these vehicles typically have a more rigid chassis and a stiffer suspension to aid in high-speed maneuverability, a spoiler can still be beneficial. One of the design goals of a spoiler is to reduce drag and increase fuel efficiency. Many vehicles have a fairly steep downward angle going from the rear edge of the roof down to the trunk or tail of the car. Air flowing across the roof tumbles over this edge at higher speeds, causing flow separation. The flow of air becomes turbulent and a low pressure zone is created, thus increases drag. Adding a spoiler at the very rear of the vehicle makes the air slice longer, gentler slope from the roof to the spoiler, which helps to reduce the flow separation. Reducing flow separation decreases drag, which increases fuel economy; it also helps keep the rear window clear because the air flows smoothly through the rear window. The limitations of conventional wind tunnel experiment and rapid developments in computer hardware, considerable efforts have been invested in the last decade to study vehicle aerodynamics computationally. This thesis will present a numerical simulation of flow around racing car with spoiler positioned at the rear end using commercial
fluid dynamic software ANSYS FLUENT®. The thesis will focus on CFD-based lift and drag prediction on the car body after the spoiler is mounted at the rear edge of the vehicle. A 3D computer model of 4-door sedan car (which will be designed with commercial software SolidWorks®) will be used as the base model. Different spoilers, in different locations will be positioned at the rear end of vehicle and the simulation will be run in order to determine the aerodynamic effects of spoiler.
Advisors/Committee Members: Drazen Fabris.
Subjects/Keywords: fluid dynamics; computational fluid dynamics; aerodynamics; motor vehicles; Aerodynamics and Fluid Mechanics; Engineering; Mechanical Engineering
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APA (6th Edition):
Cakir, M. (2012). CFD study on aerodynamic effects of a rear wing/spoiler on a passenger vehicle. (Masters Thesis). Santa Clara University. Retrieved from https://scholarcommons.scu.edu/mech_mstr/1
Chicago Manual of Style (16th Edition):
Cakir, Mustafa. “CFD study on aerodynamic effects of a rear wing/spoiler on a passenger vehicle.” 2012. Masters Thesis, Santa Clara University. Accessed April 16, 2021.
https://scholarcommons.scu.edu/mech_mstr/1.
MLA Handbook (7th Edition):
Cakir, Mustafa. “CFD study on aerodynamic effects of a rear wing/spoiler on a passenger vehicle.” 2012. Web. 16 Apr 2021.
Vancouver:
Cakir M. CFD study on aerodynamic effects of a rear wing/spoiler on a passenger vehicle. [Internet] [Masters thesis]. Santa Clara University; 2012. [cited 2021 Apr 16].
Available from: https://scholarcommons.scu.edu/mech_mstr/1.
Council of Science Editors:
Cakir M. CFD study on aerodynamic effects of a rear wing/spoiler on a passenger vehicle. [Masters Thesis]. Santa Clara University; 2012. Available from: https://scholarcommons.scu.edu/mech_mstr/1

University of California – San Diego
23.
Hsu, Ming-Chen.
Fluid-Structure Interaction Analysis of Wind Turbines.
Degree: Structural Engineering, 2012, University of California – San Diego
URL: http://www.escholarship.org/uc/item/6rn568h0
► Countries around the world are putting substantial effort into the development of wind energy technologies. The urgent need of renewable energy puts pressure on the…
(more)
▼ Countries around the world are putting substantial effort into the development of wind energy technologies. The urgent need of renewable energy puts pressure on the wind energy industry research and development to enhance the current wind generation capabilities and decrease the associated costs. Currently most wind turbine aerodynamics and aeroelasticity simulations are performed using low-fidelity methods. These methods are simple to implement and fast to execute; however, the cases involving important features, such as unsteady flow, turbulence, and details of the wind turbine geometry, are beyond their range of applicability. In this dissertation, we introduce a paradigm shift in wind turbine analysis by developing 3D, complex geometry, time-dependent, multi-physics modeling procedures for wind turbine fluid-structure interaction (FSI). The proposed framework consists of a collection of numerical methods combined into a single framework for FSI modeling and simulation of wind turbines at full scale. The use of the Navier-Stokes equations of incompressible flows for wind turbine aerodynamics is validated against experimental data. The structural modeling of the composite blades is based on the Kirchhoff-Love thin shell theory discretized using isogeometric analysis. The coupled FSI formulation is derived using the augmented Lagrangian approach and accommodates non-matching fluid-structure interface discretizations. The challenges of fluid-structural coupling and the handling of computational domains in relative motion are discussed, and the FSI computations of a 5 MW offshore baseline wind turbine are shown.
Subjects/Keywords: Engineering; Mechanics; Energy; Computational Fluid Dynamics; Computational Mechanics; Finite Element Method; Fluid-Structure Interaction; Isogeometric Analysis; Wind Energy
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hsu, M. (2012). Fluid-Structure Interaction Analysis of Wind Turbines. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/6rn568h0
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):
Hsu, Ming-Chen. “Fluid-Structure Interaction Analysis of Wind Turbines.” 2012. Thesis, University of California – San Diego. Accessed April 16, 2021.
http://www.escholarship.org/uc/item/6rn568h0.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Hsu, Ming-Chen. “Fluid-Structure Interaction Analysis of Wind Turbines.” 2012. Web. 16 Apr 2021.
Vancouver:
Hsu M. Fluid-Structure Interaction Analysis of Wind Turbines. [Internet] [Thesis]. University of California – San Diego; 2012. [cited 2021 Apr 16].
Available from: http://www.escholarship.org/uc/item/6rn568h0.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Hsu M. Fluid-Structure Interaction Analysis of Wind Turbines. [Thesis]. University of California – San Diego; 2012. Available from: http://www.escholarship.org/uc/item/6rn568h0
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Georgia Tech
24.
Haggerty, Christopher Mark.
Total cavopulmonary hemodynamics and the single ventricle: functional relationships and translational possibilities: Total cavopulmonary connection hemodynamics and the single ventricle: functional relationships and translational possibilities.
Degree: PhD, Biomedical Engineering, 2012, Georgia Tech
URL: http://hdl.handle.net/1853/51926
► Single ventricle heart defects are a rare but serious form of congenital heart disease, which affect approximately 2000 children born in the United States each…
(more)
▼ Single ventricle heart defects are a rare but serious form of congenital heart disease, which affect approximately 2000 children born in the United States each year. Staged surgical palliation, culminating with the “Fontan Procedure,” is typically required to achieve adequate supply of blood to both the pulmonary and systemic circulations while avoiding chronic ventricular volume overload. This surgery reroutes the systemic veins to the pulmonary arteries, forming a total cavopulmonary connection (TCPC), to completely bypass the right side of the heart and restore a series configuration to the cardiovascular circuits. Despite improved survival through this operative course in first weeks and years of life, Fontan patients are subjected gradual attrition and decreased life expectancy through a multitude of chronic complications. It is suspected that the adverse hemodynamics of this surgically altered physiology, including those specific to the surgical TCPC, play a role in determining patient outcome. However, the small and heterogeneous patient population has hindered decisive progress and there is still not a good understanding of the optimal care strategies on a patient-by-patient basis. In recent decades, advances in medical imaging and image-based
computational fluid dynamics (CFD) have redefined the realm of possibility for studying complex biomedical phenomena. Combined, these methods provide the means to create and evaluate patient-specific models of a wide range of cardiovascular structures, including the TCPC, with high fidelity. Results from these models can then be used for a wide array of different analyses, such as identifying regions of flow separation or stagnation, calculating hemodynamic power loss, or quantifying local flow distribution patterns. Through significant effort from numerous past investigators, a robust set of validated
computational and image processing tools has been assembled, along with the largest library of cardiac magnetic resonance (CMR) data of TCPC anatomy and flow. These tools are leveraged in this thesis to characterize the functional implications of TCPC power loss at an unprecedented scale: we report the largest CFD analysis of patient-specific TCPC hemodynamics to date with particular focus on identifying functional correlates. Combining these data with imaging-based analysis of ventricle function, we directly compare the CFD-derived hemodynamics to the performance of the single ventricle for the first time. Motivated by the physiologic significance of these findings, the same patient-specific CFD framework is used for the translational application of prospective surgery planning for hemodynamic optimization, including the first implementation of a novel TCPC connection design hypothesized to uniquely streamline the energetic performance. We conclude with a first look at the longitudinal evolution of patient functional status to begin understanding how factors such as TCPC hemodynamics contribute to poor long-term performance in these patients.
Advisors/Committee Members: Yoganathan, Ajit P. (advisor), Kanter, Kirk R. (committee member), Oshinski, John N. (committee member), Fogel, Mark A. (committee member), Gleason, Rudolph (committee member).
Subjects/Keywords: Congenital heart disease; Fluid mechanics; Computational fluid dynamics; Pediatric cardiology; Congenital heart disease; Hemodynamics; Heart Abnormalities Surgery; Computational fluid dynamics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Haggerty, C. M. (2012). Total cavopulmonary hemodynamics and the single ventricle: functional relationships and translational possibilities: Total cavopulmonary connection hemodynamics and the single ventricle: functional relationships and translational possibilities. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/51926
Chicago Manual of Style (16th Edition):
Haggerty, Christopher Mark. “Total cavopulmonary hemodynamics and the single ventricle: functional relationships and translational possibilities: Total cavopulmonary connection hemodynamics and the single ventricle: functional relationships and translational possibilities.” 2012. Doctoral Dissertation, Georgia Tech. Accessed April 16, 2021.
http://hdl.handle.net/1853/51926.
MLA Handbook (7th Edition):
Haggerty, Christopher Mark. “Total cavopulmonary hemodynamics and the single ventricle: functional relationships and translational possibilities: Total cavopulmonary connection hemodynamics and the single ventricle: functional relationships and translational possibilities.” 2012. Web. 16 Apr 2021.
Vancouver:
Haggerty CM. Total cavopulmonary hemodynamics and the single ventricle: functional relationships and translational possibilities: Total cavopulmonary connection hemodynamics and the single ventricle: functional relationships and translational possibilities. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1853/51926.
Council of Science Editors:
Haggerty CM. Total cavopulmonary hemodynamics and the single ventricle: functional relationships and translational possibilities: Total cavopulmonary connection hemodynamics and the single ventricle: functional relationships and translational possibilities. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/51926

University of Bristol
25.
Popat, Nilesh R.
Steep capillary waves on gravity waves.
Degree: PhD, 1989, University of Bristol
URL: http://hdl.handle.net/1983/78695ee9-b923-4374-b70c-6589b4215241
► The frequent presence of ripples on the free surface of water. on both thin film flows and ponds or lakes motivates this theoretical investigation into…
(more)
▼ The frequent presence of ripples on the free surface of water. on both thin film flows and ponds or lakes motivates this theoretical investigation into the propagation of ripples on gravity waves. These ripples are treated as "slowly-varying" waves in a reference frame where the gravity wave flow is steady. The methods used are those of the averaged Lagrangian (Whitham 1965,1967,1974) and the averaged equations of motion (Phillips 1966) which are shown to be equivalent. The capillary wave modulation is taken to be steady in the reference frame which brings the gravity wave, or gravity driven flow, to rest. Firstly the motion over ponds or lakes is considered. Linear capillary-gravity waves are examined in order to set the scene. Crapper's (1957) exact finite-amplitude waves are examined next to show the actual behaviour of the flow field. The underlying gravity driven flow is that of pure gravity waves over an' "infinite" depth liquid. These gravity waves are modelled with "numerically exact" solutions for periodic plane-waves. The initial studies are inviscid and show that steep gravity waves either "absorb" or "sweep-up" a range of capillary waves or, alternatively, cause them to break in the vicinity of gravity wave crests. Improvements on the theory are made by including viscous dissipation of wave energy. This leads to a number of solutions approaching "stopping velocities" or the "stopped waves solution". In addition to these effects "higher-order dispersion" is introduced for weakly nonlinear waves near linear caustics. This clarifies aspects of the dissipation results and shows that wave reflection sometimes occurs. Secondly, waves on thin film flows are considered. Linear capillary-gravity waves are again examined in order to set the scene. Kinnersley's (1957) exact finite-amplitude waves are examined next to show the actual behaviour of the flow field. The underlying gravity driven flow is given by shallow water gravity waves. No modelling of these is necessary simply because they are included within Whitham's or Phillips' equations ab initio. This study is inviscid and shows the unexpected presence of critical velocities at which pairs of solution branches originate. iii
Subjects/Keywords: 532; Computational fluid mechanics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Popat, N. R. (1989). Steep capillary waves on gravity waves. (Doctoral Dissertation). University of Bristol. Retrieved from http://hdl.handle.net/1983/78695ee9-b923-4374-b70c-6589b4215241
Chicago Manual of Style (16th Edition):
Popat, Nilesh R. “Steep capillary waves on gravity waves.” 1989. Doctoral Dissertation, University of Bristol. Accessed April 16, 2021.
http://hdl.handle.net/1983/78695ee9-b923-4374-b70c-6589b4215241.
MLA Handbook (7th Edition):
Popat, Nilesh R. “Steep capillary waves on gravity waves.” 1989. Web. 16 Apr 2021.
Vancouver:
Popat NR. Steep capillary waves on gravity waves. [Internet] [Doctoral dissertation]. University of Bristol; 1989. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1983/78695ee9-b923-4374-b70c-6589b4215241.
Council of Science Editors:
Popat NR. Steep capillary waves on gravity waves. [Doctoral Dissertation]. University of Bristol; 1989. Available from: http://hdl.handle.net/1983/78695ee9-b923-4374-b70c-6589b4215241

University of Washington
26.
Lu, Dawei.
Numerical criterion for incipient separation of turbulent flows as inferred by RANS.
Degree: 2019, University of Washington
URL: http://hdl.handle.net/1773/44012
► Simulations of turbulent flows based on the Reynolds-averaged Navier-Stokes (RANS) equations are widely used for engineering applications and are computationally less expensive than other numerical…
(more)
▼ Simulations of turbulent flows based on the Reynolds-averaged Navier-Stokes (RANS) equations are widely used for engineering applications and are computationally less expensive than other numerical simulations such as large-eddy or direct numerical simulations. We performed RANS simulations over smooth curved surfaces under adverse pressure gradient using a one-equation turbulence model and without wall-functions (i.e., the grid is fine enough to reach the viscous sublayer). First, by investigating the effect of inflow boundary condition, domain size and grid refinement, we assessed the best practices for RANS simulations. Next, we validated the RANS by comparing the results with published experimental measurements. Further, the sensitivity of turbulent flow to the degree of severity of the adverse pressure gradient is investigated by testing different curved ramp geometries, by varying the ramp slope and curvature distribution. Our results show that the key parameter to determine flow separation is the maximum slope of the ramp normalized by the non-dimensional ramp height over its streamwise length, and the location of the maximum curvature has an effect on the magnitude of skin-friction coefficient near the onset of ramp. Lastly, a numerical criterion for incipient separation as inferred by RANS is proposed. Based on this criterion, a new approach is demonstrated to examine flow separation that depends only on the ramp height-to-length ratio, normalized maximum slope and Reynolds number for the range of 2 × 10
5 ≤ Re
L ≤ 8 × 10
5 simulated via RANS.
Advisors/Committee Members: Ferrante, Antonino (advisor).
Subjects/Keywords:
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lu, D. (2019). Numerical criterion for incipient separation of turbulent flows as inferred by RANS. (Thesis). University of Washington. Retrieved from http://hdl.handle.net/1773/44012
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):
Lu, Dawei. “Numerical criterion for incipient separation of turbulent flows as inferred by RANS.” 2019. Thesis, University of Washington. Accessed April 16, 2021.
http://hdl.handle.net/1773/44012.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lu, Dawei. “Numerical criterion for incipient separation of turbulent flows as inferred by RANS.” 2019. Web. 16 Apr 2021.
Vancouver:
Lu D. Numerical criterion for incipient separation of turbulent flows as inferred by RANS. [Internet] [Thesis]. University of Washington; 2019. [cited 2021 Apr 16].
Available from: http://hdl.handle.net/1773/44012.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lu D. Numerical criterion for incipient separation of turbulent flows as inferred by RANS. [Thesis]. University of Washington; 2019. Available from: http://hdl.handle.net/1773/44012
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Salford
27.
Barber, Robert William.
Numerical modelling of jet-forced circulation in reservoirs using boundary-fitted coordinate systems.
Degree: PhD, 1990, University of Salford
URL: http://usir.salford.ac.uk/id/eprint/26561/
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280809
► Throughout the past decade, interest has grown in the use of boundary-fitted coordinate systems in many areas of computational fluid dynamics. The boundary-fitted technique provides…
(more)
▼ Throughout the past decade, interest has grown in the use of boundary-fitted coordinate systems in many areas of computational fluid dynamics. The boundary-fitted technique provides an exact method of implementing finite-difference numerical schemes in curved flow geometries and offers an alternative solution procedure to the finite-element method. The unavoidable large bandwidth of the global stiffness matrix, employed in finite-element algorithms, means that they are computationally less efficient than corresponding finite-difference schemes. As a consequence, the boundary-fitted method offers a more efficient process for solving partial differential flow equations in awkwardly shaped regions. This thesis describes a versatile finite-difference numerical scheme for the solution of the shallow water equations on arbitrary boundary-fitted non-orthogonal curvilinear grids. The model is capable of simulating flows in irregular geometries typically encountered in river basin management. Validation tests have been conducted against the severe condition of jet-forced flow in a circular reservoir with vertical side walls, where initial reflections of free surface waves pose major problems in achieving a stable solution. Furthermore, the validation exercises have been designed to test the computer model for artificial diffusion which may be a consequence of the numerical scheme adopted to stabilise the shallow water equations. The thesis also describes two subsidiary numerical studies of jet-forced recirculating flow in circular cylinders. The first of these implements a Biot-Savart discrete vortex method for simulating the vorticity in the shear layers of the inflow jet, whereas the second employs a stream function/vorticity-transport finite-difference procedure for solving the two-dimensional Navier-Stokes equations on a distorted orthogonal polar mesh. Although the predictions from the stream function/vorticity-transport model are confined to low Reynolds number flows, they provide a valuable set of benchmark velocity fields which are used to confirm the validity of the boundary-fitted shallow water equation solver.
Subjects/Keywords: 532; Computational fluid mechanics
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Barber, R. W. (1990). Numerical modelling of jet-forced circulation in reservoirs using boundary-fitted coordinate systems. (Doctoral Dissertation). University of Salford. Retrieved from http://usir.salford.ac.uk/id/eprint/26561/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280809
Chicago Manual of Style (16th Edition):
Barber, Robert William. “Numerical modelling of jet-forced circulation in reservoirs using boundary-fitted coordinate systems.” 1990. Doctoral Dissertation, University of Salford. Accessed April 16, 2021.
http://usir.salford.ac.uk/id/eprint/26561/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280809.
MLA Handbook (7th Edition):
Barber, Robert William. “Numerical modelling of jet-forced circulation in reservoirs using boundary-fitted coordinate systems.” 1990. Web. 16 Apr 2021.
Vancouver:
Barber RW. Numerical modelling of jet-forced circulation in reservoirs using boundary-fitted coordinate systems. [Internet] [Doctoral dissertation]. University of Salford; 1990. [cited 2021 Apr 16].
Available from: http://usir.salford.ac.uk/id/eprint/26561/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280809.
Council of Science Editors:
Barber RW. Numerical modelling of jet-forced circulation in reservoirs using boundary-fitted coordinate systems. [Doctoral Dissertation]. University of Salford; 1990. Available from: http://usir.salford.ac.uk/id/eprint/26561/ ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.280809

Arizona State University
28.
Greenlee, Benjamin.
A Computational Protocol for Spray Flows Using the Quadratic
Formula as the Primary Atomization Module.
Degree: Mechanical Engineering, 2020, Arizona State University
URL: http://repository.asu.edu/items/57186
► Computability of spray flows is an important issue, from both fundamental and practical perspectives. Spray flows have important applications in fuel injection, agriculture, medical devices,…
(more)
▼ Computability of spray flows is an important issue,
from both fundamental and practical perspectives. Spray flows have
important applications in fuel injection, agriculture, medical
devices, and industrial processes such as spray cooling. For this
reason, many efforts have been devoted to experimental,
computational and some theoretical aspects of spray flows. In
particular, primary atomization, the process of bulk liquid
transitioning to small droplets, is a central and probably the most
difficult aspect of spray flows. This thesis discusses developed
methods, results, and needed improvements in the modeling of
primary atomization using a predictive Sauter Mean Diameter (SMD)
formula. Primary atomization for round injectors and simplex
atomizers is modeled using a three-step procedure. For each spray
geometry, a volume-of-fluid simulation is run to resolve the
trajectory of the intact liquid core. Atomization criterion is
applied to the volume-of-fluid velocity field to determine
atomization sites. Local droplet size is predicted at the
atomization sites using the quadratic formula for Sauter Mean
Diameter. Droplets with the computed drop size are injected from
the atomization sites and are tracked as point-particles. A User
Defined Memory (UDM) code is employed to compute steady-state Sauter
Mean Diameter statistics at locations corresponding to experimental
interrogation locations. The resulting Sauter Mean Diameter,
droplet trajectory, and droplet velocity are compared against
experimental data to validate the computational protocol. This
protocol can be implemented on coarse-grid, time-averaged
simulations of spray flows, and produces convincing results when
compared with experimental data for pressure-atomized sprays with
and without swirl. This approach is general and can be adapted in
any spray geometry for complete and efficient computations of spray
flows.
Subjects/Keywords: Fluid mechanics; Thermodynamics; Computational physics; CFD; Multiphase; Quadratic Formula; Spray
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Greenlee, B. (2020). A Computational Protocol for Spray Flows Using the Quadratic
Formula as the Primary Atomization Module. (Masters Thesis). Arizona State University. Retrieved from http://repository.asu.edu/items/57186
Chicago Manual of Style (16th Edition):
Greenlee, Benjamin. “A Computational Protocol for Spray Flows Using the Quadratic
Formula as the Primary Atomization Module.” 2020. Masters Thesis, Arizona State University. Accessed April 16, 2021.
http://repository.asu.edu/items/57186.
MLA Handbook (7th Edition):
Greenlee, Benjamin. “A Computational Protocol for Spray Flows Using the Quadratic
Formula as the Primary Atomization Module.” 2020. Web. 16 Apr 2021.
Vancouver:
Greenlee B. A Computational Protocol for Spray Flows Using the Quadratic
Formula as the Primary Atomization Module. [Internet] [Masters thesis]. Arizona State University; 2020. [cited 2021 Apr 16].
Available from: http://repository.asu.edu/items/57186.
Council of Science Editors:
Greenlee B. A Computational Protocol for Spray Flows Using the Quadratic
Formula as the Primary Atomization Module. [Masters Thesis]. Arizona State University; 2020. Available from: http://repository.asu.edu/items/57186

University of Bristol
29.
Popat, Nilesh R.
Steep capillary waves on gravity waves.
Degree: PhD, 1989, University of Bristol
URL: https://research-information.bris.ac.uk/en/studentTheses/78695ee9-b923-4374-b70c-6589b4215241
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334009
► The frequent presence of ripples on the free surface of water. on both thin film flows and ponds or lakes motivates this theoretical investigation into…
(more)
▼ The frequent presence of ripples on the free surface of water. on both thin film flows and ponds or lakes motivates this theoretical investigation into the propagation of ripples on gravity waves. These ripples are treated as "slowly-varying" waves in a reference frame where the gravity wave flow is steady. The methods used are those of the averaged Lagrangian (Whitham 1965,1967,1974) and the averaged equations of motion (Phillips 1966) which are shown to be equivalent. The capillary wave modulation is taken to be steady in the reference frame which brings the gravity wave, or gravity driven flow, to rest. Firstly the motion over ponds or lakes is considered. Linear capillary-gravity waves are examined in order to set the scene. Crapper's (1957) exact finite-amplitude waves are examined next to show the actual behaviour of the flow field. The underlying gravity driven flow is that of pure gravity waves over an' "infinite" depth liquid. These gravity waves are modelled with "numerically exact" solutions for periodic plane-waves. The initial studies are inviscid and show that steep gravity waves either "absorb" or "sweep-up" a range of capillary waves or, alternatively, cause them to break in the vicinity of gravity wave crests. Improvements on the theory are made by including viscous dissipation of wave energy. This leads to a number of solutions approaching "stopping velocities" or the "stopped waves solution". In addition to these effects "higher-order dispersion" is introduced for weakly nonlinear waves near linear caustics. This clarifies aspects of the dissipation results and shows that wave reflection sometimes occurs. Secondly, waves on thin film flows are considered. Linear capillary-gravity waves are again examined in order to set the scene. Kinnersley's (1957) exact finite-amplitude waves are examined next to show the actual behaviour of the flow field. The underlying gravity driven flow is given by shallow water gravity waves. No modelling of these is necessary simply because they are included within Whitham's or Phillips' equations ab initio. This study is inviscid and shows the unexpected presence of critical velocities at which pairs of solution branches originate. iii
Subjects/Keywords: 532; Computational fluid mechanics
Record Details
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Share »
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Popat, N. R. (1989). Steep capillary waves on gravity waves. (Doctoral Dissertation). University of Bristol. Retrieved from https://research-information.bris.ac.uk/en/studentTheses/78695ee9-b923-4374-b70c-6589b4215241 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334009
Chicago Manual of Style (16th Edition):
Popat, Nilesh R. “Steep capillary waves on gravity waves.” 1989. Doctoral Dissertation, University of Bristol. Accessed April 16, 2021.
https://research-information.bris.ac.uk/en/studentTheses/78695ee9-b923-4374-b70c-6589b4215241 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334009.
MLA Handbook (7th Edition):
Popat, Nilesh R. “Steep capillary waves on gravity waves.” 1989. Web. 16 Apr 2021.
Vancouver:
Popat NR. Steep capillary waves on gravity waves. [Internet] [Doctoral dissertation]. University of Bristol; 1989. [cited 2021 Apr 16].
Available from: https://research-information.bris.ac.uk/en/studentTheses/78695ee9-b923-4374-b70c-6589b4215241 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334009.
Council of Science Editors:
Popat NR. Steep capillary waves on gravity waves. [Doctoral Dissertation]. University of Bristol; 1989. Available from: https://research-information.bris.ac.uk/en/studentTheses/78695ee9-b923-4374-b70c-6589b4215241 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334009

Florida Atlantic University
30.
Buono, Armand C.
Predicting the flow & noise of a rotor in a turbulent boundary layer using an actuator disk – Rans approach.
Degree: MS, 2014, Florida Atlantic University
URL: http://purl.flvc.org/fau/fd/FA00004269
;
(URL)
http://purl.flvc.org/fau/fd/FA00004269
► Summary: The numerical method presented in this study attempts to predict the mean, non-uniform flow field upstream of a propeller partially immersed in a thick…
(more)
▼ Summary: The numerical method presented in this study attempts to predict the mean, non-uniform flow field upstream of a propeller partially immersed in a thick turbulent boundary layer with an actuator disk using CFD based on RANS in ANSYS FLUENT. Three different configurations, involving an infinitely thin actuator disk in the freestream (Configuration 1), an actuator disk near a wall with a turbulent boundary layer (Configuration 2), and an actuator disk with a hub near a wall with a turbulent boundary layer (Configuration 3), were analyzed for a variety of advance ratios ranging from J = 0.48 to J =1.44. CFD results are shown to be in agreement with previous works and validated with experimental data of reverse flow occurring within the boundary layer above the flat plate upstream of a rotor in the Virginia Tech’s Stability Wind Tunnel facility. Results from Configuration 3 will be used in future aero-acoustic computations.
2014
Degree granted: Thesis (M.S.) – Florida Atlantic University, 2014.
Collection: FAU
Advisors/Committee Members: Glegg, Stewart A. L. (Thesis advisor), Florida Atlantic University (Degree grantor), College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering.
Subjects/Keywords: Aeroelasticity; Computational fluid dynamics; Fluid dynamic measurements; Fluid mechanics – Mathematical models; Turbomachines – Fluid dynamics; Turbulence – Mathematical models
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Buono, A. C. (2014). Predicting the flow & noise of a rotor in a turbulent boundary layer using an actuator disk – Rans approach. (Masters Thesis). Florida Atlantic University. Retrieved from http://purl.flvc.org/fau/fd/FA00004269 ; (URL) http://purl.flvc.org/fau/fd/FA00004269
Chicago Manual of Style (16th Edition):
Buono, Armand C. “Predicting the flow & noise of a rotor in a turbulent boundary layer using an actuator disk – Rans approach.” 2014. Masters Thesis, Florida Atlantic University. Accessed April 16, 2021.
http://purl.flvc.org/fau/fd/FA00004269 ; (URL) http://purl.flvc.org/fau/fd/FA00004269.
MLA Handbook (7th Edition):
Buono, Armand C. “Predicting the flow & noise of a rotor in a turbulent boundary layer using an actuator disk – Rans approach.” 2014. Web. 16 Apr 2021.
Vancouver:
Buono AC. Predicting the flow & noise of a rotor in a turbulent boundary layer using an actuator disk – Rans approach. [Internet] [Masters thesis]. Florida Atlantic University; 2014. [cited 2021 Apr 16].
Available from: http://purl.flvc.org/fau/fd/FA00004269 ; (URL) http://purl.flvc.org/fau/fd/FA00004269.
Council of Science Editors:
Buono AC. Predicting the flow & noise of a rotor in a turbulent boundary layer using an actuator disk – Rans approach. [Masters Thesis]. Florida Atlantic University; 2014. Available from: http://purl.flvc.org/fau/fd/FA00004269 ; (URL) http://purl.flvc.org/fau/fd/FA00004269
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