Development and Application of SST-SAS Turbulence Model in the ...

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SAS concept. Turbulence scales • Two scales required for statistical description L, T • Two equations → two scales? E(k) spectrum © 2007 ANSYS, Inc. All rights reserved. 4 ANSYS, Inc. Proprietary
SAS concept. 2-eq RANS models • k-ω model • One local scale: S • 2 nd scale: Dk Dt ω Dt – Shear layer thickness via diffusion: L = κ·y , L = δ – Too dissipative to resolve the energy cascade – Homogeneous turbulence, frozen LES velocity field: No diffusion → Contradiction: ( 2 2 S − c ω ) + Diff ( k) = νt µ D 2 2 − βω ( ω) © 2007 ANSYS, Inc. All rights reserved. 5 ANSYS, Inc. Proprietary = α S S α S 2 2 + Diff = cµ ω 2 = βω 2
Page 1 and 2: Development and Application of SST-
Page 3: SAS concept • URANS: unphysical s
Page 7 and 8: SAS concept. SAS and RANS • ⎛ 2
Page 9 and 10: SAS concept definition • SAS: 2 n
Page 11 and 12: SST-SAS turbulence model • Decay
Page 13 and 14: NACA0021 airfoil beyond stall • M
Page 15 and 16: Delta wing • Hybrid unstructured
Page 17 and 18: Full aircraft configuration • Del
Page 19 and 20: Full aircraft configuration • Res
Page 21 and 22: 3-D acoustic cavity • M219 test c
Page 23: Other DESIDER tests simulated • B

Development and Application of SST-SAS Turbulence Model in the ...

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