18th International Meshing Roundtable
Salt Lake City, UT, USA.
October 25-28, 2009
Massachusetts Institute of Technology,
jandren@mit.edu
NASA Langley Research Center, Computational AeroSciences Branch,
Mike.Park@NASA.gov
Introduction
Output (adjoint) based adaptation is a method that has been used to automate
the unstructured grid generation task of inviscid [3] and two-dimensional
(2D) turbulent [6,7] flow simulation. This project challenges existing three dimensional
(3D) techniques to produce strongly anisotropic grids for modeling
the boundary layer on a flat plate. Elements with large face angles can cause
difficulties for the diffusion operator employed in this study [1], so a range
of Reynolds numbers are explored to quantify the accuracy of the solutions
on the output adapted grids. Laminar and turbulent flows are simulated on
an extruded flat plate to exercise the 3D algorithm on a case with a know
solution. Regular, fully adapted, and hybrid unstructured tetrahedral grids
are used to examine the ability of different grid constructions to reproduce
Blasius or empirically derived velocity profiles. The hybrid approach retained
the original regular tetrahedral grid near the flat plate and adapted the grid
outside of this region. This approach produced similar velocity profiles to the
regular grids and better results than the fully adaptive cases for the highest
Reynolds number cases.
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