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Is CFL condition irrelevant for incompressible flow?

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Old   November 5, 2009, 18:33
Default Is CFL condition irrelevant for incompressible flow?
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I am trying to model an air flow over an object problem. The Mach number is well below 1 so the air is modeled as incompressible. The Re is about 1.5e4 and I am using Spalart-Allmaras model. For angles of attack great than 25 degree, unsteady state is used and I wonder if the CFL condition applies here. The Navier--Stokes equations seem to be elliptic but I am not sure if the nonlinear convective terms play any role.

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