why lift coefficients don't converge at high angle of attacks? -- CFD Online Discussion Forums

January 11, 2012, 12:46	why lift coefficients don't converge at high angle of attacks?	#1
mingersai Member Ming Cai Join Date: Mar 2011 Posts: 50 Rep Power: 15	Dear Friends I'm running simulation on a NACA 64 210 airfoil with k-omega sst model with Re = 2.6 E6 . The chord length is 1m. Angle of Attack ranges from 0 to 20. I'm changing the inlet velocity for different angles. Mesh is shown below everything is fine before angle of attack getting to 12 degree, both lift coefficient and drag coefficients oscillates periodicly after 12 degree I don't know if this is the correct solution. However, before this angle the results are reasonable Is it because of the mesh? Does it mean changing inlet velocity is not correct for higher degree angles of attack? Thanks for your help. ksrinu likes this.

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