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Dissertations / Theses on the topic 'Unstructured Grid Generation'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

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1

Said, Rajab. "Unstructured parallel grid generation." Thesis, Swansea University, 2003. https://cronfa.swan.ac.uk/Record/cronfa42637.

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The ultimate goal of this study is to develop a 'tool' by which large-scale unstructured grids for realistic engineering problems can be generated efficiently on any parallel computer platform. The adopted strategy is based upon a geometrical partitioning concept, where the computational domain is sub-divided into a number of sub-domains which are then gridded independently in parallel. This study focuses on three-dimensional applications only, and it implements a Delaunay triangulation based generator to generate the sub-domain grids. Two different approaches have been investigated, where the

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2

Burgess, David A. "Parallel computing for unstructured mesh algorithms." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.318758.

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3

Zagaris, George. "Parallel Unstructured Grid Generation for Complex Real-World Aerodynamic Simulations." W&M ScholarWorks, 2008. https://scholarworks.wm.edu/etd/1539626877.

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4

Tysell, Lars. "Hybrid Grid Generation for Viscous Flow Computations Around Complex Geometries." Doctoral thesis, KTH, Mekanik, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11934.

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A set of algorithms building a program package for the generation of twoandthree-dimensional unstructured/hybrid grids around complex geometrieshas been developed. The unstructured part of the grid generator is based on the advancing frontalgorithm. Tetrahedra of variable size, as well as directionally stretched tetrahedracan be generated by specification of a proper background grid, initiallygenerated by a Delaunay algorithm. A marching layer prismatic grid generation algorithm has been developedfor the generation of grids for viscous flows. The algorithm is able to handleregions of narrow ga

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5

Parrish, Michael H. "A selective approach to conformal refinement of unstructured hexahedral meshes /." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1985.pdf.

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6

McDonald, Cameron L. "Automatic, Unstructured Mesh Generation for 2D Shelf Based Tidal Models." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1550.pdf.

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7

Hu, Guanghui. "Numerical simulations of the steady Euler equations on unstructured grids." HKBU Institutional Repository, 2009. http://repository.hkbu.edu.hk/etd_ra/1106.

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8

Kumar, Amitesh. "Hole patching in 3D unstructured surface mesh." Birmingham, Ala. : University of Alabama at Birmingham, 2007. http://www.mhsl.uab.edu/dt/2007m/kumar.pdf.

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9

Globisch, G., and S. V. Nepomnyaschikh. "The hierarchical preconditioning having unstructured grids." Universitätsbibliothek Chemnitz, 1998. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199801398.

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In this paper we present two hierarchically preconditioned methods for the fast solution of mesh equations that approximate 2D-elliptic boundary value problems on unstructured quasi uniform triangulations. Based on the fictitious space approach the original problem can be embedded into an auxiliary one, where both the hierarchical grid information and the preconditioner by decomposing functions on it are well defined. We implemented the corresponding Yserentant preconditioned conjugate gradient method as well as the BPX-preconditioned cg-iteration having optimal computational costs. Several nu

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10

Spirkin, Anton M. "A three-dimensional particle-in-cell methodology on unstructured Voronoi grids with applications to plasma microdevices." Link to electronic dissertation, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-050506-145257/.

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11

Jawahar, P. "A High-Resolution Procedure For Euler And Navier-Stokes Computations On Unstructured Grids." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/226.

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A finite-volume procedure, comprising a gradient-reconstruction technique and a multidimensional limiter, has been proposed for upwind algorithms on unstructured grids. The high-resolution strategy, with its inherent dependence on a wide computational stencil, does not suffer from a catastrophic loss of accuracy on a grid with poor connectivity as reported recently is the case with many unstructured-grid limiting procedures. The continuously-differentiable limiter is shown to be effective for strong discontinuities, even on a grid which is composed of highly-distorted triangles, without advers

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12

Blades, Eric Lindsay. "A sliding interface method for unsteady unstructured parallel flow simulations." Diss., Mississippi State : Mississippi State University, 2004. http://library.msstate.edu/etd/show.asp?etd=etd-10142004-165050.

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13

Athanasiadis, Aristotelis. "Three-dimensional hybrid grid generation with application to high Reynolds number viscous flows." Doctoral thesis, Universite Libre de Bruxelles, 2004. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211130.

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In this thesis, an approach is presented for the generation of grids suitable for the simulation of high Reynolds number viscous flows in complex three-dimensional geometries. The automatic and reliable generation of such grids is today on the biggest bottlenecks in the industrial CFD simulation environment.<p><p>In the proposed approach, unstructured tetrahedral grids are employed for the regions far from the viscous boundaries of the domain, while semi-structured layers of high aspect ratio prismatic and hexahedral elements are used to provide the necessary grid resolution inside the boundar

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14

Acikgoz, Nazmiye. "Adaptive and Dynamic Meshing Methods for Numerical Simulations." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14521.

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For the numerical simulation of many problems of engineering interest, it is desirable to have an automated mesh adaption tool. This is important especially for problems characterized by anisotropic features and require mesh clustering in the direction of high gradients. Another significant issue in meshing emerges in unsteady simulations with moving boundaries, where the boundary motion has to be accommodated by deforming the computational grid. Similarly, there exist problems where current mesh needs to be adapted to get more accurate solutions. To solve these problems, we propose three nove

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15

Bin, Mohamad Badry Ahmad Badarudin. "Synthetic Turbulence Generation for LES on Unstructured Cartesian Grids." Thesis, Cranfield University, 2007. http://hdl.handle.net/1826/3172.

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A parallel CFD code to solve incompressible fluid flow on unstructured Cartesian meshes has been developed almost from ground up. Turbulence statistics have been computed using the Large Eddy Simulation technique. The new code was subjected to some validation where results are compared to available reference data. An analysis on the iteration and discretisation errors was carried out. This code was then applied to predict the lid driven cubical cavity flow in at a bulk Reynolds number of 10,000. Three different mesh sizes were used to investigate independence of results on grid size. Amongst o

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16

Kim, Kyusup. "Three-dimensional hybrid grid generator and unstructured flow solver for compressors and turbines." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1437.

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A numerical method for the simulation of compressible turbulent ﬂows is presented. This method includes a novel hybrid grid generation for airfoil cascades and an unstructured mesh ﬂow solver. The mesh tool incorporates a mapping technique and a grid smoothing method. The mapping technique is used to build an initial volume mesh and the grid smoothing method is used to improve the quality of the initial mesh. The grid smoothing is based on the optimization of mesh-quality parameters. The further improvement of the smoothed mesh is achieved by an edge-swapping and node-insertion technique. The

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17

Globisch, Gerhard. "The hierarchical preconditioning having unstructured threedimensional grids." Universitätsbibliothek Chemnitz, 2005. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200501021.

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Continuing the previous work in the preprint 97-11 done for the 2D-approach in this paper we describe the Yserentant preconditioned conjugate gradient method as well as the BPX-preconditioned cg-iteration fastly solving 3D-elliptic boundary value problems on unstructured quasi uniform grids. These artificially constructed hierarchical methods have optimal computational costs. In the case of the sequential computing several numerical examples demonstrate their efficiency not depending on the finite element types used for the discretiziation of the original potential problem. Moreover, implement

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18

Lashley, Raymond K. "Automatic generation of accurate advection schemes on unstructured grids and their application to meteorological problems." Thesis, University of Reading, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394176.

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19

Chen, Jenn-Gwo, and 陳振國. "Numerical Investigation of Dynamic Unstructured Grid Generation for Store Separation Application." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/51292353911862964310.

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碩士<br>淡江大學<br>機械工程研究所<br>82<br>Due to the flexibility and effectiveness of unstructured grid generation in the application of computational fluid dynamics (CFD) , it was felt that the development of a new technique in unstructured grids should be very meaningful and practical. The flow field case chosen in this study is the difficult store separation problem, and through the solution of this problem, hopefully the adaptive and dynamic grid techniques can be constru

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20

Fai, Yip, and 葉暉. "The Study of Three Dimensional Unstructured Grid Generation with Bowyer Scheme." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/37996150610672484184.

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碩士<br>淡江大學<br>機械工程研究所<br>83<br>Unstructured Grid possess the ability to deal with complex configurations. It has been rapidly developed from the time of 80s and now can be used maturely in solving two dimensional flow field. There are totally four kinds of method: Quadtree Method, Sweepline Method, Advancing Algorithm and Bowyer Algorithm. Both the Advancing Front Algorithm and Bowyer Algorithm has a leading development in three dimensional grid generation, while most of the rest can only handle a few problems, even specified configuration. 　　In this work, Bowyer Algorithm is chosen for it'

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21

Chao, Maw-Jyi, and 趙茂吉. "Unstructured Grid Generation and Agglomeration Multigrid Method for the Euler Solutions over Complex Aircraft Configurations." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/55979646037562662675.

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博士<br>國立成功大學<br>航空太空工程學系<br>85<br>A combined Octree/Advancing-Front method is developed to generate 3-Dunstructured tetrahedral mesh. Also developed is an implicit Euler flow solver using upwind finite-volume method and agglomerationmultigrid method for convergence acceleration to compute Euler flowover complex configurations of fighter/stores combination.

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22

Gopalakrishna, N. "On Three Dimensional High Lift Flow Computations." Thesis, 2014. http://hdl.handle.net/2005/3127.

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Computing 3D high lift flows has been a challenge to the CFD community because of three important reasons: complex physics, complex geometries and large computational requirements. In the recent years, considerable progress has been made in understanding the suitability of various CFD solvers in computing 3D high lift flows, through the systematic studies carried out under High Lift Prediction workshops. The primary focus of these workshops is to assess the ability of the CFD solvers to predict CLmax and αmax associated with the high lift flows, apart from the predictability of lift and drag o

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