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 20 of 58 for “"Grid Generation"”.
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A fault tolerant grid generation technique
Automatic and parallel mesh generation has been highlighted as a bottleneck for large scale automated Computational Fluid Dynamics analysis. The desire for large scale automated CFD is driven by the growing computational capabilities in large scale supercomputers. Unfortunately, as compute clusters …
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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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Algebraic Grid Generation Using Tensor Product B-Splines
… methods are more successful if the accompanying grid has lines which are smooth and nearly orthogonal. This thesis discusses the development of an algorithm which produces such a grid when given the boundary description.</p> <p>Topological considerations in structuring the grid generation mapping …
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Finite difference grid generation on serial and parallel machines
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1995.
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Grid Generation and CFD Analysis of Variable Geometry Screw Machines
This thesis describes the development of grid generation and numerical methods for predicting the flow in variable geometry, positive displacement screw machines. It has been shown, from a review of available literature, that the two main approaches available to generate deforming grids for the CFD …
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Exploration of Physics-Informed Grid Generation Technique for Wall-Modeled LES using Eagle3D
… for generating a lean, physics based WMLES grid is described.</p> <p>The technique utilizes a RANS solution to extract turbulence information, user-specified values related to resolution of turbulent energy levels, acoustics waves, and shock waves, to generate a point cloud for producing a …
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Strategy development for object-oriented multiblock grid generation and adaptation to complex geometries
… 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 object-oriented …
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Automatic parallel octree grid generation software with an extensible solver framework and a focus on urban simulation
… parallel, Cartesian, linear forest-of-octree grid generator and partial differential equation (PDE) solver framework is presented. This research is bundled into an application programmed with C++ which uses MPI for distributed parallelism. The application is named paros which stands for …
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Development of Automatic CFD Grid Generation for the Design of the Preliminary Wing Sweep Schedule for the Gulfstream Quiet Supersonic Jet
… CFD analysis methods. The use of automating the gridding procedure allowed for numerous cases to be investigated. The examination of the drag polar for different Mach cases indicated the optimum corresponding wing sweep position. The study results revealed that for the Mach 0.85 case, the wings …
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An adaptive hybrid mesh generation method for complex geometries
An adaptive hybrid mesh generation method is described to automatically provide spatial discretizations suitable for computational fluid dynamics or other 2D solver applications. This method employs a hierarchical grid generation technique to create a background mesh, an extrusion-type method for …
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A z-ordering cartesian grid method and its application in flow simulation
… method of automatic and robust Cartesian mesh generation method for two-dimensional and three-dimensional flow simulation problems is developed and introduced in this thesis. The new algorithm adopts an idea of zigzag mapping from computer graphics for terrain generation. Three achievements …
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Generalized spatial discretization techniques for space-marching algorithms
… current and future availability of unstructured grid generation techniques. The first discretization employs a generalized indexing strategy utilizing triangular elements in the two dimensions normal to the streamwise direction, while maintaining structure within the streamwise direction. The …
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Tetrahedral mesh optimization and generation via topological transformations and gradient based node perturbation
… created by third-party software as well as a grid generation methodology created for this work. The particular algorithms involved are explained in detail including, an explication of the primary optimization metric, weighted condition number. In addition, a thorough literature review …
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Layer-averaged modeling of turbidity currents with a finite element method
… non-channelized turbidity currents, a deforming grid generation technique is employed.
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Computation of high-lift aerodynamics using unstructured grids and Reynolds-stress turbulence models
… the development ofan efficient unstructured grid generation method for high lift flows and theapplication of Differential Reynolds Stress Models (DRSM).The method described in this thesis, separates the grid generation processinto two steps: generation of the anisotropic regions and isotropic …
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Sonic boom prediction methods using feature-based adaptation of unstructured meshes
… an inviscid supersonic configuration using two grid generation refinement procedures. The first method uses P_HUGG, a parallel hierarchical Cartesian mesh generation algorithm to generate a volume mesh, with the solution-based mesh adaptation capability of P_HUGG being exploited. The mesh …
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Sensorless Control of a Bidirectional Boost Converter for a Fuel Cell Energy Management System
… to increase the acceptance of fuel cells for off-grid generation, the cost of the energy management system must be greatly reduced. Of the many ways to accomplish this, this paper looks at reducing cost through topology changes and elimination of current sensors. A dual 2.5kW non-isolated …
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A Cartesian finite-volume method for the Euler equations
… method with a non-body-fitted Cartesian grid. A new numerical formulation for complicated body geometries is developed in conjunction with implicit flux-splitting schemes. A variety of numerical computations have been performed to validate the numerical methodologies developed. …
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Mesh generation by domain bisection
… work on two dimensional triangular unstructured grid generation by Lewis and Robinson [LeR76] is first examined, in which a recursive bisection technique of computational order nlog(n) was implemented. This technique is then extended to incorporate new methods of geometry input and the automatic …
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Modelling the microclimate in a conical bottomed circular grain silo
… applying a mapping technique with an algebraic grid generation method, to discretise the governing equations in the arbitrary geometries that describe the grain stores. The finite different solution of the governing equations are obtained by using Alternating Direction Implicit method, Thomas …
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