one question about the Spalart-Allmaras model?
First, we often neglect the trip term in the transport equation of the SA model; then the boundary value is zero, including the wall boungdary and freeflow boundary; and we often set the initial value to be zero.
Clearly, all zero will be the solution of the equation. So how we get the turbulence viscosity?
Or is the solution of the transport equation denpendent on the initial value of the flowfield?
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