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Spalart-Allmaras Turbulence ModelSpalart-Allmaras model is a one equation model for the turbulent viscosity. Additional recommended knowledge
Original modelThe turbulent eddy viscosity is given by The rotation tensor is given by and d is the distance from the closest surface. The constants are Modifications to original modelAccording to Spalart it is safer to use the following values for the last two constants: Other models related to the S-A model: DES (1999) [1] DDES (2006) Model for compressible flowsThere are two approaches to adapting the model for compressible flows. In the first approach the turbulent dynamic viscosity is computed from where ρ is the local density. The convective terms in the equation for are modified to where the right hand side (RHS) is the same as in the original model. Boundary conditionsWalls: Freestream: Ideally , but some solvers can have problems with a zero value, in which case can be used. This is if the trip term is used to "start up" the model. A convenient option is to set in the freestream. The model then provides "Fully Turbulent" behavior, i.e., it becomes turbulent in any region that contains shear. Outlet: convective outlet. References
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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Spalart-Allmaras_Turbulence_Model". A list of authors is available in Wikipedia. |