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Adaptive unstructured triangular mesh generation and flow solvers for the Navier-Stokes equations at high Reynolds numberA method for generating high quality unstructured triangular grids for high Reynolds number Navier-Stokes calculations about complex geometries is described. Careful attention is paid in the mesh generation process to resolving efficiently the disparate length scales which arise in these flows. First the surface mesh is constructed in a way which ensures that the geometry is faithfully represented. The volume mesh generation then proceeds in two phases thus allowing the viscous and inviscid regions of the flow to be meshed optimally. A solution-adaptive remeshing procedure which allows the mesh to adapt itself to flow features is also described. The procedure for tracking wakes and refinement criteria appropriate for shock detection are described. Although at present it has only been implemented in two dimensions, the grid generation process has been designed with the extension to three dimensions in mind. An implicit, higher-order, upwind method is also presented for computing compressible turbulent flows on these meshes. Two recently developed one-equation turbulence models have been implemented to simulate the effects of the fluid turbulence. Results for flow about a RAE 2822 airfoil and a Douglas three-element airfoil are presented which clearly show the improved resolution obtainable.
Document ID
19960011643
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Ashford, Gregory A. (Michigan Univ. Ann Arbor, MI, United States)
Powell, Kenneth G. (Michigan Univ. Ann Arbor, MI, United States)
Date Acquired
September 6, 2013
Publication Date
October 1, 1995
Publication Information
Publication: NASA. Langley Research Center, ICASE(LaRC Workshop on Adaptive Grid Methods
Subject Category
Fluid Mechanics And Heat Transfer
Accession Number
96N18079
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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