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 19 of 19 for “"Structured Grid"”.
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High-Performancs Sparse Matrix-Vector Multiplication on GPUS for Structured Grid Computations
… multiplication for matrices arising from structured grid problems with high degrees of freedom at each grid node. Sparse matrix-vector multiplication is a critical step in the iterative solution of sparse linear systems of equations arising in the solution of partial differential equations …
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Three-dimensional upward scheme for solving the Euler equations on unstructured tetrahedral grids
… the three-dimensional Euler equations on unstructured tetrahedral meshes. The method yields solution accuracy and efficiency comparable to that currently available from similar structured-grid codes. The key to achieving this result is a novel cell reconstruction process which is based on an …
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Hamiltonian Paths and Strands for Unified Grid Approach for Computing Aerodynamic Flows
… algorithm using Hamiltonian paths and strand grids is presented for compressible Reynolds-Averaged Navier–Stokes (RANS) formulation as a unified grid approach. The hidden line-structure is robustly identified on the general unstructured grid with mixed elements which provides a framework for …
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Strategy development for object-oriented multiblock grid generation and adaptation to complex geometries
… with the strategy development for multiblock structured grid generation to complex geometries. Based on the grid generation practices over years, a set of grid construction rules is developed to provide the CFD engineer an object-oriented method for grid design. The essential core of the …
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A CFD investigation of cavitation and associated deposit formation in modern diesel fuel injectors
… an injector nozzle was constructed using a fully structured grid.
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Three-dimensional hydrodynamic model set-up: a case study of middle Tennessee River
… part of this research, an automated MATLAB based structured grid generator for EFDC was developed and was tested by developing a test model for Tennessee River near Chattanooga area. The test model was developed for a 9.92 km long segment of the Tennessee River starting from the downstream of the …
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An Investigation of the Hydrodynamic Effects of Enteromorpha clathrata Fouling on Hydrofoils
… The model was meshed using a Laplacian grid smoothing technique that forced the structured grid lines to follow the same approximate contour as the stream lines, allowing for quicker convergence of the solution matrix and a lower degree of rounding error than normally associated with …
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Modeling coupled physics and biology in ocean straits
… two-dimensional numerical model is created on a structured grid using operator splitting and masking. This model is able to accurately represent biology for various physical flows, including advection-dominated flows over discontinuities, by using the Weighted Essentially Non-Oscillatory (WENO) …
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An Original Method for Computing Complex Non-Premixed Flows in Chemical Equilibrium
… in parallel on the university cluster for the structured grid of a combustion chamber and exhaust nozzle of a rocket designed by the class of the thesis advisor.</p>
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Parametrization-independent elliptic surface grid generation
The generation of computational grids on surfaces of three-dimensional configurations is an important component of many areas of computational research, both as a boundary grid for volume grid generation or to perform computations on the surface. For reasons of computational efficiency, structured …
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A Study of Immersed Boundary Method in a Ribbed Duct for the Internal Cooling of Turbine Blades
… of simulating complex geometry with a simple structured grid. IBM is first investigated in well-accepted benchmark cases: channel flow and pipe flow with circular cross-section. IBM captures all the flow features with very good accuracy in these two cases. Then a two side ribbed duct geometry …
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Two-dimensional Euler computations on a triangular mesh using an upwind, finite-volume scheme
… solution of the Euler equations on unstructured, triangular meshes using a flux-difference split, upwind method. The procedure uses a dual mesh system to implement the finite-volume scheme using conserved variables stored at the vertices of the triangles. The vertices of the triangles …
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Towards a deeper understanding of hybrid programming
… (pure and hybrid) implementation options for a structured grid sparse matrix-vector multiplication in depth. These choices differ in how hybrid parallelism is exploited at the application level (coarse-grained vs. fine-grained problem decomposition) and with respect to the hybrid programming …
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Robust structured multigrid at extreme scales
… By exploiting structure in a problem, robust structured multigrid methods gain important performance benefits because they preserve structure throughout the multigrid hierarchy. In parallel these methods benefit from nearest neighbor stencil-based communication patterns; however, the increased …
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The development of dedicated CFD solver for aerodynamic analysis on internal and external flow
… present work applies a combination of Algebraic grid generation and Elliptic Grid. In vi addition to this, the developed computer codes are designed in such away to allow one solve the flow problem by use of structured grid or unstructured grid. To validate the developed computer codes, their …
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Matrix-free time-domain methods for general electromagnetic analysis
… free of matrix solutions. However, it requires a structured orthogonal grid for space discretization. In this work, we develop a new time-domain method that naturally requires no matrix solution, regardless of whether the discretization is a structured grid or an unstructured mesh. No dual mesh, …
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On the Programmability and Performance of OpenCL Designs for FPGA
… in the application area of 3D-stencil (i.e., structured grid) computation. Experiments in this thesis show that the performance of an OpenCL approach can achieve 95% of the peak attainable performance of a microkernel for multiple problem sizes. In comparison to the OpenCL approach, an HDL …
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Evaluating the OpenACC API for Parallelization of CFD Applications
… that the stencil access pattern required by the structured-grid CFD code sometimes leads to performance degrading conflict misses in the hardware managed CPU caches. The GPU code, which primarily uses software managed caching, is found to be free from these issues. Overall, it is observed that …
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Integrated Multidisciplinary Design Optimization Using Discrete Sensitivity Analysis for Geometrically Complex Aeroelastic Configurations
… work. For the first step, a three-dimensional unstructured grid approach to aerodynamic shape sensitivity analysis and design optimization has been developed. The advantage of unstructured grids, when compared with a structured-grid approach, is their inherent ability to discretize irregularly …