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A comparative study of upwind and MacCormack schemes for CAA benchmark problemsIn this study, upwind schemes and MacCormack schemes are evaluated as to their suitability for aeroacoustic applications. The governing equations are cast in a curvilinear coordinate system and discretized using finite volume concepts. A flux splitting procedure is used for the upwind schemes, where the signals crossing the cell faces are grouped into two categories: signals that bring information from outside into the cell, and signals that leave the cell. These signals may be computed in several ways, with the desired spatial and temporal accuracy achieved by choosing appropriate interpolating polynomials. The classical MacCormack schemes employed here are fourth order accurate in time and space. Results for categories 1, 4, and 6 of the workshop's benchmark problems are presented. Comparisons are also made with the exact solutions, where available. The main conclusions of this study are finally presented.
Document ID
19950023726
Document Type
Conference Paper
Authors
Viswanathan, K. (Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Sankar, L. N. (Georgia Inst. of Tech. Atlanta, GA., United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Publication Information
Publication: NASA. Langley Research Center, ICASE(LaRC Workshop on Benchmark Problems in Computational Aeroacoustics (CAA) p 185-195 (SEE N95-30133 10-71)
Subject Category
ACOUSTICS
Funding Number(s)
CONTRACT_GRANT: NAS1-20102
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.