Tweaking settings to prevent divergence at high angles of attack -- CFD Online Discussion Forums

September 14, 2021, 03:06	Tweaking settings to prevent divergence at high angles of attack	#1
Adithya_11 Member Adithya Join Date: May 2021 Posts: 73 Rep Power: 4	Hello I am simulating the flow around an aircraft. Settings- SA turbulence model, coupled pressure-velocity with time factor 0.1, second order discretization. My simulations run well and converge at low and moderate angles of attack. However, it diverges at 10 degrees. I need to get results till 14 degrees as I expect the CL max to be achieved at 12 deg. I am thinking of tweaking some under-relaxation parameter, but not sure which one and by how much. Currently, they are left at default. Anybody would have any suggestions? Or, is it recommended to run a first order simulation, get a result, and then use that to initialize and continue with the second order simulation?

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