Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"coupled problems"”.
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Analytical study of the Least Squares Quasi-Newton method for interaction problems
… Even if powerful solvers often already exist for problems in a single physical domain (e.g. structural or fluid problems), the development of similar tools for multi-physics problems is still ongoing. When the interaction (or coupling) between the two systems is strong, many methods still fail or …
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Design and analysis of transient nonlinear coupled systems
… design and analysis of transient nonlinear coupled problems are presented. This class of problems includes systems with history dependent material response, e.g. plasticity. The traditional finite element analysis is combined with sensitivity analysis and numerical optimization to obtain a …
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A lattice boltzmann/s n framework for coupled heat transfer and neutron transport problems
Nuclear reactors are complex, coupled, multi-physics and multi-scale systems. There are usually two approaches — loose coupling and tight coupling — to solve coupled mathematical equations describing a multi-physics system. The major advantage of loose coupling is to allow separately validated …
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Non-Relativistic Holography from Horava Gravity
… of the Yang-Mills theory is solved by weakly coupled gravity. Another interesting class of strongly coupled field theories are those of a non-relativistic nature that arise in condensed matter systems. Herein, motivated by the generic symmetry structure of these theories, a non-relativistic …
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Characterization, modeling, and simulation of multiscale directed-assembly systems
Nanoscience is a rapidly developing field at the nexus of all physical sciences which holds the potential for mankind to gain a new level of control of matter over matter and energy altogether. Directed-assembly is an emerging field within nanoscience in which non-equilibrium system dynamics are …
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High Precision Thermal Morphing of the Smart Anisogrid Structure for Space-Based Applications
… to demonstrate the ability to simplify complex coupled problems. By reducing the parameters to only the most critical, the resulting morphing optimization computation and engineering time is greatly reduced. The third piece builds the foundation for the thermal morphing anisogrid structure by …
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Mixed-fidelity CFD Simulations for Aero-engines: A Fan-intake Interaction Study
… of complex components, where aerodynamics can be coupled. In these coupled problems, flow separation may exist and the multiscale turbulence needs to be finely resolved to obtain an accurate solution. A high-fidelity simulation in such scenarios, however, is still infeasible for industrial …
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A Computational Thermo-Chemo-Mechanics Framework for the Large-Scale Simulation of Material and Structural Failure in Hypersonic Environments
… thermodynamically-consistent description of the coupled multiphysics problem, and the numerical formulation extends the scalable discontinuous Galerkin(DG)/Cohesive Zone Modeling paradigm to thermo-chemo-fracture mechanics. The approach is distinguished by its unified DG treatment of the coupled …
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Adaptive Finite Elements for Systems of PDEs: Software Concepts, Multi-level Techniques and Parallelization
… application of these methods in a large class of problems demands for suitable and robust tools for a flexible and efficient implementation. In order to play a crucial role in scientific and engineering research, besides efficiency in the numerical solution, also efficiency in problem setup and …
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An Investigation of Phase Change Material (PCM)-Based Ocean Thermal Energy Harvesting
… Robin transmission condition for fluid-structure coupled problems with strong added-mass effect is proposed and investigated using fluid structure interaction (FSI) model problems. This can be a potential method for the future research on the fluid-structure coupled numerical analysis of AUVs, …
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Sound radiation prediction by scale models
… method is being developed for use in such coupled problems.</p> <p class="MsoNormal" style="margin-bottom:0cm;text-align:justify;line-height: normal;mso-layout-grid-align:none;text-autospace:none">It is considered that there is a need for a technique which is able to take account of the …
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Space charge determination in HVDC power cable and its influence on electric field
… of both temperature and electric field, the coupled problems impose significant difficulty to know the electric field distribution in HVDC power cables. <br/><br/>In this thesis, scientific contributions have been made towards the research on power cables by allowing both users and cable …
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Stable algorithms for generalized thermoelasticity based on operator-splitting and time-discontinuous Galerkin finite element methods
… with the theoretical and numerical analysis of coupled problems in thermoelasticity. Of particular interest are models that support propagation of thermal energy as waves, rather than the usual mechanism by diffusion. The thesis consists of two parts. The first deals with the non-classical, …
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Application of the Variational Fracture Model to Hydraulic Fracturing in Poroelastic Media
… and reservoir. In this dissertation, a fully coupled hydraulic fracturing simulator is developed by coupling reservoir-fracture flow models with a mechanical model for reservoir deformation. Reservoir-fracture deformation is modeled using the variational fracture model which provides a unified …
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On the resolution of misspecification in stochastic optimization, variational inequality, and game-theoretic problems
… Practical approaches in resolving such a set of coupled problems have been either sequential or direct variational approaches. In the case of the former, this entails the following steps: (i) a solution to the learning problem for parameters is first obtained; and (ii) a solution is obtained to …
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Modelling the transport of iron-based colloids in saturated porous media
… concentrations are solved simultaneously, and coupled with empirical functions describing the explicit dependence of deposition and release coefficients on the ionic strength. MNM1D was validated against well-established analytical and finite-elements transport codes that solve colloid …