Date of Award

3-2005

Document Type

Thesis

Degree Name

Master of Science

Department

Department of Aeronautics and Astronautics

First Advisor

Richard J. McMullan, PhD

Abstract

A global fourth-order solution method that incorporates compact differencing with Roe's approximate Riemann solver was investigated. This method was incorporated into a one-dimensional numerical simulation of the compressible Euler equations, and applied to a one-dimensional shock tube problem. The method was also extended to two dimensions, and applied to a two-dimensional shock tube problem and an advecting vortical structure problem on both rectilinear and curvilinear meshes. The results were compared to a third-order Roe scheme and a fourth-order compact difference scheme. An order of accuracy determination showed that it has an order of accuracy somewhere near fourth order, with absolute error comparable to that of the standard compact difference scheme. With proper selection of solution parameters, the scheme was also shown to accurately capture a discontinuous solution where unfiltered compact schemes would become unstable.

AFIT Designator

AFIT-GAE-ENY-05-M05

DTIC Accession Number

ADA434268

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