Is CFL condition irrelevant for incompressible flow? -- CFD Online Discussion Forums

November 5, 2009, 17:33	Is CFL condition irrelevant for incompressible flow?	#1
violet New Member violetviolet Join Date: Jun 2009 Posts: 2 Rep Power: 0	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. Thanks in advance.

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