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A study of the characteristic based split scheme (CBS), considering the incorporation of 'speed up' techniques. / Raymond Hickey

Swansea University Author: Raymond Hickey

Abstract

The scope of this dissertation centers on the application of the Characteristic Based SpHt (CBS) algorithm to the governing equations of compressible flow, represented by the conservation form of the Navier Stokes equations. It is proposed that the inherent stability of split algorithm alongside the...

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Published: 2008
Institution: Swansea University
Degree level: Doctoral
Degree name: Ph.D
URI: https://cronfa.swan.ac.uk/Record/cronfa42499
Abstract: The scope of this dissertation centers on the application of the Characteristic Based SpHt (CBS) algorithm to the governing equations of compressible flow, represented by the conservation form of the Navier Stokes equations. It is proposed that the inherent stability of split algorithm alongside the explicit nature of the CBS scheme utilised in this dissertation will produce accurate results. To study the robustness and accuracy of the CBS scheme, various unstructured and hybrid meshes have been used. The method has been extended to three dimensions and the code parallelised to accelerate the solution. In addition to laminar compressible flows, at various Mach numbers, the code has been extended to incorporate RANS based turbulence modeling. The performance of the CBS scheme is established by studying a variety of flow problems. The problems considered include test cases of an inviscid, viscous and turbulent nature for flows past both two dimensional and three dimensional solid geometries. Computed results are compared to those published in literature. In addition the use and benefits of artificial diffusion, shock capturing and structured viscous layers are discussed at relevant points of this dissertation.
Keywords: Computer science.
College: Faculty of Science and Engineering

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