Development and Application of SST-SAS Turbulence Model in the ...
Development and Application of SST-SAS Turbulence Model in the ...
Development and Application of SST-SAS Turbulence Model in the ...
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<strong>SAS</strong> concept def<strong>in</strong>ition<br />
• <strong>SAS</strong>: 2 nd flow scale <strong>in</strong> <strong>the</strong> source terms<br />
typically via 2 nd velocity derivative<br />
• Requirements:<br />
– Proper RANS performance <strong>in</strong> stable<br />
flow region<br />
– Break-up <strong>of</strong> large unsteady structures<br />
<strong>in</strong>to a turbulent spectrum<br />
– Proper energy dissipation at small<br />
scale (high wave number damp<strong>in</strong>g)<br />
No grid &<br />
time step<br />
dependence<br />
Based on<br />
<strong>the</strong> grid<br />
spac<strong>in</strong>g ∆<br />
© 2007 ANSYS, Inc. All rights reserved. 9 ANSYS, Inc. Proprietary
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