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1.
Roquier, Gérard.
Etude de la compacité optimale des mélanges granulaires binaires : classe granulaire dominante, effet de paroi, effet de desserrement : Study of the optimal solid fraction of binary granular mixtures : dominant granular class, wall effect, loosening effect.
Degree: Docteur es, Structures et Matériaux, 2016, Université Paris-Est
URL: http://www.theses.fr/2016PESC1001
► La compacité des matériaux granulaires est une grandeur qui intéresse un grand nombre de secteurs, notamment les bétons hydrauliques. Lorsque les fractions granulaires ne possèdent…
(more)
▼ La compacité des matériaux granulaires est une grandeur qui intéresse un grand nombre de secteurs, notamment les bétons hydrauliques. Lorsque les fractions granulaires ne possèdent pas des rapports de tailles infinis, deux interactions géométriques se développent : l’effet de paroi et l’effet de desserrement. La première peut se décrire ainsi : une grosse particule isolée constitue un « intrus » contre lequel viennent se ranger les petites particules, créant un supplément de vides à l’interface. La seconde se produit lorsque les petits grains sont insuffisamment fins pour se glisser entre les gros. Nous analysons comment elles sont prises en compte dans un certain nombre de modèles d’empilement en nous fixant finalement sur celui de de Larrard et al. : le modèle d’empilement
compressible (MEC), l’un des plus efficaces. Dans celui-ci, les effets de paroi et de desserrement sont quantifiés par l’intermédiaire de deux coefficients dont les expressions sont obtenues par lissage de données expérimentales en fonction du rapport des diamètres fins/gros. Cependant, il n’existe aucune théorie pleinement satisfaisante permettant de les obtenir. Cette thèse vise à combler ce chaînon manquant. Nous avons conduit notre étude dans le cadre des empilements ordonnés et compacts de particules afin d’être en adéquation avec les hypothèses de constitution du MEC qui propose, comme préalable à l’obtention de la compacité réelle, la détermination d’une compacité virtuelle définie comme la compacité maximale susceptible d’être atteinte si l’on pouvait déposer, un à un, chaque grain à son emplacement idéal. Cette façon de procéder permet la création de cellules élémentaires juxtaposées. Dans ce cadre, l’interaction exercée par une espèce granulaire sur une autre de taille différente est menée à partir d’une étude localisée autour d’une particule « intruse » de la classe dominée, entourée de particules de la classe dominante. La simulation numérique apporte une confirmation de la validité du modèle. En plus de fournir des coefficients d’effets de paroi et de desserrement très proches de ceux prédits théoriquement, elle a permis l’étude d’empilements désordonnés de compacité maximale pour des billes bidispersées sans frottement dont les rapports de tailles valent 0,2 et 0,4. Le concept de « pressions partielles », qui tient compte à la fois des aspects géométrique et mécanique, a permis d’affiner la notion de classe dominante et de mieux appréhender la constitution du squelette porteur de l’édifice granulaire. En plus des zones constituées par les « fins dominants » et par les « gros dominants », il existe une zone mixte que nous avons dénommée « zone de synergie du squelette porteur » où les « pressions partielles » fines-grosses sont les plus importantes. En tenant compte de la nouvelle théorie développée pour les interactions géométriques, le modèle d’empilement
compressible (MEC) subit une évolution et devient le MEC 4-paramètres, qui sont : les coefficients d’effet de paroi et d’effet de desserrement, le rapport de tailles de caverne…
Advisors/Committee Members: Roux, Jean-Noël (thesis director).
Subjects/Keywords: Effet de paroi; Effet de desserrement; Modèle d'empilement compressible 4-Paramètres; Simulation numérique; Compacité; Viscosité; Wall effect; Loosening effect; 4-Parameter compressible packing model; Numerical simulation; Solid fraction; Viscosity
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APA ·
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APA (6th Edition):
Roquier, G. (2016). Etude de la compacité optimale des mélanges granulaires binaires : classe granulaire dominante, effet de paroi, effet de desserrement : Study of the optimal solid fraction of binary granular mixtures : dominant granular class, wall effect, loosening effect. (Doctoral Dissertation). Université Paris-Est. Retrieved from http://www.theses.fr/2016PESC1001
Chicago Manual of Style (16th Edition):
Roquier, Gérard. “Etude de la compacité optimale des mélanges granulaires binaires : classe granulaire dominante, effet de paroi, effet de desserrement : Study of the optimal solid fraction of binary granular mixtures : dominant granular class, wall effect, loosening effect.” 2016. Doctoral Dissertation, Université Paris-Est. Accessed January 15, 2021.
http://www.theses.fr/2016PESC1001.
MLA Handbook (7th Edition):
Roquier, Gérard. “Etude de la compacité optimale des mélanges granulaires binaires : classe granulaire dominante, effet de paroi, effet de desserrement : Study of the optimal solid fraction of binary granular mixtures : dominant granular class, wall effect, loosening effect.” 2016. Web. 15 Jan 2021.
Vancouver:
Roquier G. Etude de la compacité optimale des mélanges granulaires binaires : classe granulaire dominante, effet de paroi, effet de desserrement : Study of the optimal solid fraction of binary granular mixtures : dominant granular class, wall effect, loosening effect. [Internet] [Doctoral dissertation]. Université Paris-Est; 2016. [cited 2021 Jan 15].
Available from: http://www.theses.fr/2016PESC1001.
Council of Science Editors:
Roquier G. Etude de la compacité optimale des mélanges granulaires binaires : classe granulaire dominante, effet de paroi, effet de desserrement : Study of the optimal solid fraction of binary granular mixtures : dominant granular class, wall effect, loosening effect. [Doctoral Dissertation]. Université Paris-Est; 2016. Available from: http://www.theses.fr/2016PESC1001
2.
ABDUL WAHAB CHOWDHURY.
Numerical Simulation of Compressible Fluid-Structure Interaction in One and Two Dimension.
Degree: 2008, National University of Singapore
URL: http://scholarbank.nus.edu.sg/handle/10635/16109
Subjects/Keywords: Ghost Solid Fluid Method (GSFM); Fluid-Structure Interaction; Compressible Flow; Elastic-Plastic Deformation
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APA (6th Edition):
CHOWDHURY, A. W. (2008). Numerical Simulation of Compressible Fluid-Structure Interaction in One and Two Dimension. (Thesis). National University of Singapore. Retrieved from http://scholarbank.nus.edu.sg/handle/10635/16109
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):
CHOWDHURY, ABDUL WAHAB. “Numerical Simulation of Compressible Fluid-Structure Interaction in One and Two Dimension.” 2008. Thesis, National University of Singapore. Accessed January 15, 2021.
http://scholarbank.nus.edu.sg/handle/10635/16109.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
CHOWDHURY, ABDUL WAHAB. “Numerical Simulation of Compressible Fluid-Structure Interaction in One and Two Dimension.” 2008. Web. 15 Jan 2021.
Vancouver:
CHOWDHURY AW. Numerical Simulation of Compressible Fluid-Structure Interaction in One and Two Dimension. [Internet] [Thesis]. National University of Singapore; 2008. [cited 2021 Jan 15].
Available from: http://scholarbank.nus.edu.sg/handle/10635/16109.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
CHOWDHURY AW. Numerical Simulation of Compressible Fluid-Structure Interaction in One and Two Dimension. [Thesis]. National University of Singapore; 2008. Available from: http://scholarbank.nus.edu.sg/handle/10635/16109
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Loughborough University
3.
Zhang, Bo.
Constitutive modelling of municipal solid waste.
Degree: PhD, 2007, Loughborough University
URL: http://hdl.handle.net/2134/7984
► Design of landfills must consider both stability and integrity of the lining system. Therefore, stresses and strains in both mineral and geosynthetic lining materials must…
(more)
▼ Design of landfills must consider both stability and integrity of the lining system. Therefore, stresses and strains in both mineral and geosynthetic lining materials must be controlled. Interaction between waste and barrier system is of particular importance for assessing the stability and structural integrity of steep non-self supporting barrier systems. The most appropriate approach to assess the interaction is the use of numerical modelling techniques, and therefore an appropriate constitutive model for waste material is required to represent its mechanical behaviour. In a literature review the key aspects of mechanical behaviour of municipal solid waste (MSW) were investigated, including the influence of compressible and reinforcing particles on compression and shear behaviour of MSW were identified. Constitutive modelling of both MSW and soil material were reviewed, based on which the methodology for this study have been developed. In addition, requirements of an appropriate constitutive model for MSW have been suggested from the numerical modelling experience, and a framework to develop a constitutive model for MSW was produced. A one-dimensional compression model was developed by including the influence of compressible particles on MSW compression behaviour. One-dimensional compression tests on both real and synthetic waste samples were modelled and the results have shown that the compression model can reproduce the measured behaviour. A fibre reinforcing model was developed by including the influence of reinforcing particles on MSW shear behaviour. A triaxial compression test on fibre reinforced sand was modelled and the results have shown that the reinforcing model can predict its shear strength. A constitutive model for MSW has been developed by combining the Modified Cam-Clay with the one-dimensional compression and the fibre reinforcing models. Typical MSW triaxial compression tests have been modelled and the results have shown that the MSW model can reproduce the stress-strain behaviour in specific strain ranges. The constitutive model for MSW has been coded into a non-linear elasto-plastic finite element method program. Comparisons between the finite element analysis results and the analytical solutions have been performed and good agreements have been obtained.
Subjects/Keywords: 628.44564; Municipal solid waste; Constitutive model; Compression behaviour; Shear behaviour; Compressible particles; Reinforcing particles; Finite element method
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Zhang, B. (2007). Constitutive modelling of municipal solid waste. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/7984
Chicago Manual of Style (16th Edition):
Zhang, Bo. “Constitutive modelling of municipal solid waste.” 2007. Doctoral Dissertation, Loughborough University. Accessed January 15, 2021.
http://hdl.handle.net/2134/7984.
MLA Handbook (7th Edition):
Zhang, Bo. “Constitutive modelling of municipal solid waste.” 2007. Web. 15 Jan 2021.
Vancouver:
Zhang B. Constitutive modelling of municipal solid waste. [Internet] [Doctoral dissertation]. Loughborough University; 2007. [cited 2021 Jan 15].
Available from: http://hdl.handle.net/2134/7984.
Council of Science Editors:
Zhang B. Constitutive modelling of municipal solid waste. [Doctoral Dissertation]. Loughborough University; 2007. Available from: http://hdl.handle.net/2134/7984
4.
Ostoich, Christopher.
Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation.
Degree: PhD, 4048, 2013, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/44351
► Future high-speed air vehicles will be lightweight, flexible, and reusable. Vehicles fitting this description are subject to severe thermal and fluid dynamic loading from multiple…
(more)
▼ Future high-speed air vehicles will be lightweight, flexible, and reusable. Vehicles fitting this description are
subject to severe thermal and fluid dynamic loading from multiple sources such as aerothermal heating, propulsion system exhaust, and high dynamic pressures. The combination of low-margin design requirements and extreme environmental conditions emphasizes the occurrence of fluid-thermal-structural coupling. Numerous attempts to field such vehicles have been unsuccessful over the past half-century due partially to the inability of traditional design and analysis practices to predict the structural response in this flight regime. In this thesis, a high-fidelity computational approach is used to examine the fluid-structural response of aerospace structures in high-speed flows. The method is applied to two cases: one involving a fluid-thermal interaction problem in a hypersonic flow and the other a fluid-structure interaction study involving a turbulent boundary layer and a compliant panel.
The coupled fluid-thermal investigation features a nominally rigid aluminum spherical dome fixed to a ceramic panel holder placed in a Mach 6.59 laminar boundary layer. The problem was originally studied by Glass and Hunt in a 1988 wind tunnel experiment in the NASA Langley 8-Foot High Temperature Tunnel and is motivated by thermally bowed body panels designed for the National Aerospace Plane. In this work, the
compressible Navier-Stokes equations for a thermally perfect gas and the transient heat equation in the structure are solved simultaneously using two high-fidelity solvers coupled at the
solid-fluid interface. Predicted surface heat fluxes are within 10% of the measured values in the dome interior with greater differences found near the dome edges where uncertainties concerning the experimental model's construction likely influence the thermal dynamics. On the flat panel holder, the local surface heat fluxes approach those on the windward dome face due to a dome-induced horseshoe vortex scouring the panel's surface. Comparisons with reduced-order models of heat transfer indicate that they perform with varying levels of accuracy around some portions of the geometry while completely failing to predict significant heat loads in regions where the dome-influenced flow impacts the ceramic panel. Cumulative effects of flow-thermal coupling at later simulation times on the reduction of panel drag and surface heat transfer are quantified.
The second fluid-structure study investigates the interaction between a thin metallic panel and a Mach 2.25 turbulent boundary layer with an initial momentum thickness Reynolds number of 1200. A transient, non-linear, large deformation, 3D finite element solver is developed to compute the dynamic response of the panel. The solver is coupled at the fluid-structure interface with the
compressible Navier-Stokes solver, the latter of which is used for a direct numerical simulation of the turbulent boundary layer. In this approach, no simplifying assumptions regarding the structural solution…
Advisors/Committee Members: Bodony, Daniel J. (advisor), Bodony, Daniel J. (Committee Chair), Geubelle, Philippe H. (Committee Chair), Austin, Joanna M. (committee member), Pantano-Rubino, Carlos A. (committee member), Spottswood, Stephen M. (committee member).
Subjects/Keywords: Aerothermal; aeroelastic; fluid-structure interaction; computational fluid dynamics; computational solid mechanics; compressible turbulence
…Fluid domain . . . . . . . . . . . . . . . . . . . . . . .
7.2 Solid domain… …of a TBL
Over a Compliant Panel in Mach 2.25 Flow . . . . . . . .
8.1 Compressible… …8.2.1 Fluid domain . . . . . . . . . . . . . . . . . . . . . .
8.2.2 Solid domain… …212
. 214
. 215
. 216
. 218
. 219
Appendix E Solution of 2D Steady-State Compressible… …Boundary Layer Equations . . . . . . . . . . . . . . . . . . . . . . 222
E.1 Compressible…
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ostoich, C. (2013). Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/44351
Chicago Manual of Style (16th Edition):
Ostoich, Christopher. “Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation.” 2013. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 15, 2021.
http://hdl.handle.net/2142/44351.
MLA Handbook (7th Edition):
Ostoich, Christopher. “Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation.” 2013. Web. 15 Jan 2021.
Vancouver:
Ostoich C. Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2013. [cited 2021 Jan 15].
Available from: http://hdl.handle.net/2142/44351.
Council of Science Editors:
Ostoich C. Aerothermal and aeroelastic response prediction of aerospace structures in high-speed flows using direct numerical simulation. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2013. Available from: http://hdl.handle.net/2142/44351

University of Melbourne
5.
Höfgen, Eric.
Combining Shear and Compression: A new Perspective on Dewatering.
Degree: 2019, University of Melbourne
URL: http://hdl.handle.net/11343/233960
► In many industries competition nationally or internationally is ever developing and thereby the need for optimisation and innovation is increasing. All these industries apply solid-liquid…
(more)
▼ In many industries competition nationally or internationally is ever developing and thereby the need for optimisation and innovation is increasing. All these industries apply solid-liquid separation or dewatering processes as an essential unit operation. Filtration is limited by the rate and extent of dewatering as a function of the solids concentration. The rate can be described by the hindered settling function, R(phi), which is inversely related to the permeability. The second limitation is the extent, which is described in compressional rheology by the compressive yield stress, py(phi) and for further cake consolidation higher pressures have to be applied. Proper characterisation is necessary and around the world several characterisation techniques and devices exist, which have to be compared.
When examining different devices one can see that a variety of forces act on the material, such as compression and shear. How and in what extent does shear affect dewatering? Shear affects the dewatering by adding another mode of load application to the material and imparting a relative movement between layers. When compression and shear are independently measured, flow is achieved in shear by at least a magnitude lower than in compression. Thereby, it is of great interest to investigate the potential to influence dewatering by combining shear and compression for more effective dewatering.
A novel dewatering technology called High Pressure Dewatering Rolls combines shear and compression in a unique way. With the HPDR and other dewatering devices employing shear and compression, the characterisation in combined application is necessary. A novel development is the Vane-in-a-Filter (ViaF), which combines the dead-end piston-driven filtration rig with the Vane-in-a-Cup (ViaC) method from aiming at quantifying the influence on shear for different compressional loads. In order to bridge the gap between the ViaF and the ViaC another characterisation device called Vane-under-Compressional-Loading (VuCL) is proposed by applying weights onto the suspension below the compressive yield stress at that solids concentration. With these two measurement devices combined shear and compression can be evaluated.
In this thesis with publication, the solid-liquid separation theory and characterisation, the
application with the HPDR and two fundamental investigative tools for combined shear and compression are going to be presented. At the start, the comparison of the different solid-liquid frameworks and the benchmark between Nutsche Filter, Compression-Permeability cell and the dead-end piston-driven filtration rig are going to be presented. Further, the High Pressure Dewatering Rolls are presented by comparing it to industrial devices on a solids concentration basis and thereby assessing this novel dewatering device combining shear and compression with an applied vacuum. This work leads to the question on how combined shear and compression can be characterised and the Vane-in-a-Filter is presented with experimental results to close this…
Subjects/Keywords: Compressional rheology; Compressible materials; Compression-permeability cell (CP-cell); Conventional filtration theory; Nutsche filter; Filtration rig; Dewatering; Solid-liquid separation; Shear enhanced compression; Characterisation; High pressure dewatering rolls; Combined shear and compression
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Höfgen, E. (2019). Combining Shear and Compression: A new Perspective on Dewatering. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/233960
Chicago Manual of Style (16th Edition):
Höfgen, Eric. “Combining Shear and Compression: A new Perspective on Dewatering.” 2019. Doctoral Dissertation, University of Melbourne. Accessed January 15, 2021.
http://hdl.handle.net/11343/233960.
MLA Handbook (7th Edition):
Höfgen, Eric. “Combining Shear and Compression: A new Perspective on Dewatering.” 2019. Web. 15 Jan 2021.
Vancouver:
Höfgen E. Combining Shear and Compression: A new Perspective on Dewatering. [Internet] [Doctoral dissertation]. University of Melbourne; 2019. [cited 2021 Jan 15].
Available from: http://hdl.handle.net/11343/233960.
Council of Science Editors:
Höfgen E. Combining Shear and Compression: A new Perspective on Dewatering. [Doctoral Dissertation]. University of Melbourne; 2019. Available from: http://hdl.handle.net/11343/233960
6.
Selvaraj, Deeptesh.
Wave Propagation in Solids with Finite Deformation and Finite Strain.
Degree: MS, Mechanical Engineering, 2017, University of Kansas
URL: http://hdl.handle.net/1808/24142
► This work investigates one dimensional wave propagation in thermoelastic and ther- moviscoelastic solids with and without memory. The work considers the solid matter to be…
(more)
▼ This work investigates one dimensional wave propagation in thermoelastic and ther- moviscoelastic solids with and without memory. The work considers the
solid matter to be
compressible with finite deformation and finite strain. The mathematical model utilizes Contravariant second Piola-Kirchhoff stress and Green’s strain as work con- jugate pair in the conservation and balance laws. For thermoviscoelastic solids the second Piola-Kirchhoff stress is decomposed into equilibrium and deviatoric stress. The constitutive theory for deviatoric stress is expressed in terms of Greens’s strain tensor. The thermodynamic pressure in the constitutive theory for equilibrium second Piola-Kirchhoff stress is defined as a function of density using the published experi- mental data for rubber. In case of thermoelastic solids the constitutive theories consists of total second Piola-Kirchhoff stress as a function of Green’s strain tensor. The math- ematical model consisting of conservation, balance laws and the constitutive theories are first presented in R3, then explicitly given in R1 followed by the dimensionless form in R1 . The nonlinear partial differential equation describing 1D wave propaga- tion for finite deformation and finite strain are numerically solved using space-time finite element method based on space-time residual functional in which the local ap- proximation function for a space-time element are p-version hierarchical with higher order global differentiability in space and time. For an increment of time the solu- tion is computed for a space-time strip and then time marched to obtain the evolution for desired value of time. The solutions computed in the present work are compared with recently published work in which the thermodynamic pressure is approximated by mean normal stress.
Advisors/Committee Members: Surana, Karan S (advisor), Tenpas, Peter W (cmtemember), Sorem, Robert M (cmtemember).
Subjects/Keywords: Mechanical engineering; Compressible solid; Continuum Mechanics; Finite Element Analysis; Large deformation; Space time coupled; Wave Propagation
…to study 1D wave propagation in solid media in which compressibility is accounted for in a… …thermoelastic solid, µ , λ , µ 1 , λ 1 are
e e e e
material co-efficients for thermoviscoelastic solid… …without memory and λ1 , µ1 , µ 1 , λ 1 , are material
co-efficients for thermoelastic solid with… …memory, λ1 is relaxation time for thermoviscoelastic solid
with memory, k is co-efficients of… …axial wave propagation in thermoelastic solid and thermoviscoelastic solid with and without…
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Selvaraj, D. (2017). Wave Propagation in Solids with Finite Deformation and Finite Strain. (Masters Thesis). University of Kansas. Retrieved from http://hdl.handle.net/1808/24142
Chicago Manual of Style (16th Edition):
Selvaraj, Deeptesh. “Wave Propagation in Solids with Finite Deformation and Finite Strain.” 2017. Masters Thesis, University of Kansas. Accessed January 15, 2021.
http://hdl.handle.net/1808/24142.
MLA Handbook (7th Edition):
Selvaraj, Deeptesh. “Wave Propagation in Solids with Finite Deformation and Finite Strain.” 2017. Web. 15 Jan 2021.
Vancouver:
Selvaraj D. Wave Propagation in Solids with Finite Deformation and Finite Strain. [Internet] [Masters thesis]. University of Kansas; 2017. [cited 2021 Jan 15].
Available from: http://hdl.handle.net/1808/24142.
Council of Science Editors:
Selvaraj D. Wave Propagation in Solids with Finite Deformation and Finite Strain. [Masters Thesis]. University of Kansas; 2017. Available from: http://hdl.handle.net/1808/24142
7.
Hernandez, Alberto M.
Computational modeling of advanced, multi-material energetic materials and systems.
Degree: PhD, Theoretical & Applied Mechanics, 2018, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/102411
► The aim of this thesis is to develop and implement a robust reactive simulation tool that can aid in the design of explosive devices by…
(more)
▼ The aim of this thesis is to develop and implement a robust reactive simulation tool that can aid in the design of explosive devices by numerically investigating the reactive mechanism of different explosive materials; study how detonation waves travel through them and determine how to initiate explosives with the smallest amount of booster material. These types of problems are numerically challenging to model and require multiple components that interact with each other. Multi-material models are necessary since shocks and detonation waves will travel through and impinge on material interfaces. High order and robust methods are needed to maintain sharp representations of these material boundaries. They need to be capable of numerically maintaining stable interfaces between high energy explosive materials and low density inerts such as air. This is a challenging problem since it involves strong wave interactions at the interface, large pressure and density gradients across the same, and non-linearity issues that result from the use of real equations of state. From a software developing point of view, consistent code infrastructure also needs to be followed to allow the ability to easily implement new models and modify existing ones. Also, given the multi-scaled nature of these types of problems, methods need to be efficient and scalable in both shared and distributed memory architectures for parallel computing.
The proposed parallel and robust numerical reactive hydrodynamic solver implementation maintains sharp
solid and material interfaces. The solver is designed to run on distributed memory architectures using a simple yet efficient MPI communication implementation. Multiple level sets are used to track the evolution of material interfaces over time and represent internal
solid regions. Approximate Riemann solvers and the Ghost Fluid Method or Overlap Domain Method are used to enforce appropriate interface boundary conditions. Ghost nodes are set by a new local and point-wise node sorting algorithm that decouples these nodes by establishing their connectivity to other ghost nodes. This approach allows us to enforce boundary conditions via a direct procedure removing the need to solve a coupled system of equations numerically. Issues concerning the use of reactive, non-ideal equations of state and their implementation in high explosive hydrodynamic codes are studied. The accuracy and fidelity of the solver is examined by simulating a series of explosive multi-material problems, showing good agreement between numerical results and experimental data.
Advisors/Committee Members: Stewart, Donald S. (advisor), Stewart, Donald S. (Committee Chair), Matalon, Moshe (committee member), Glumac, Nick (committee member), Fischer, Paul (committee member).
Subjects/Keywords: Multi-material; reactive flow; parallel computing; level sets; compressible Euler equations; solid internal boundaries; node sorting; computational physics
…The solid red line is the material
interface on both images… …nodes. The red solid line is the surface described by ψ(~x) = 0… …Density profile for Sod’s problem at time = 0.2. The exact solution is the solid black line and… …Density profile for Lax’s problem at time = 0.13. The exact solution is the solid black line
and… …Reactive problem of [9]. The solid black line is the high resolution simulation with Nx…
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Hernandez, A. M. (2018). Computational modeling of advanced, multi-material energetic materials and systems. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/102411
Chicago Manual of Style (16th Edition):
Hernandez, Alberto M. “Computational modeling of advanced, multi-material energetic materials and systems.” 2018. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed January 15, 2021.
http://hdl.handle.net/2142/102411.
MLA Handbook (7th Edition):
Hernandez, Alberto M. “Computational modeling of advanced, multi-material energetic materials and systems.” 2018. Web. 15 Jan 2021.
Vancouver:
Hernandez AM. Computational modeling of advanced, multi-material energetic materials and systems. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2018. [cited 2021 Jan 15].
Available from: http://hdl.handle.net/2142/102411.
Council of Science Editors:
Hernandez AM. Computational modeling of advanced, multi-material energetic materials and systems. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2018. Available from: http://hdl.handle.net/2142/102411
.