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 6 of 6 for “"Non-uniform Mesh"”.
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Validation of the DRACO Particle-in-Cell Code using Busek 200W Hall Thruster Experimental Data
… The code is now also capable of using a non-uniform mesh that uses any combination of uniform, linear and exponential stretching schemes in any of the three directions. A stretched mesh can be used to refine simulation results in certain areas, such as the exit of a thruster, or improve …
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Approximation of the LQR control problem for systems governed by partial functional differential equations
… scheme in the delay variable. We compare a uniform mesh to a nonuniform mesh and give numerical results which indicate that the non-uniform mesh, which gives a better approximation of the kernel near the singularity, yields faster convergence. We give a proof of convergence of the simulation …
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Validation Studies of Single-Phase Natural Circulation Response of the Fluoride salt-cooled High-temperature Reactor (FHR)
… governing equations was modified to account for non-uniform mesh spacing and to allow for an explicit (forward Euler), semi-implicit (Crank Nicolson), or fully implicit (backward Euler) solution. The models used to approximate the density integral were also modified to account for a variable mesh …
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Efficient moving mesh methods for Q-tensor models of liquid crystals
… finite element method is used to solve a non-linear singularly perturbed boundary value problem which arises from a one dimensional Q-tensor model of liquid crystals.;The adaptive non-uniform mesh is generated by equidistribution of a selection of strictly positive monitor functions. By an …
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Improved performance of the hPIC particle-in-cell code by incorporating a new non-uniform implicit mesh based on the PUMI infrastructure
Uniform structured meshes are inefficient at capturing the high plasma gradients in a Scrape-Off-Layer (SOL). Especially in the magnetic and electrostatic sheaths forming in front of the material surfaces. The hPIC Particle In Cell code developed previously at UIUC has been modified to incorporate …
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Adaptive mesh refinement in topology optimization
… constrained topology optimization with Adaptive Mesh Refinement (AMR). Regions with stress concentrations dominate the optimized design. As such, we first present an approach to obtain designs with accurately computed stress fields within the context of topology optimization. To achieve this …