Divergence detected AMG solver error

Rub Nawaz Khalid · August 11, 2010, 23:57

hi all friends me a student n m using Spar-Almars model for computing flow on an airfoil NACA 2415 at mach 0.6 angle of attack 4degree during ittration the solver show error tha divergence detected AMG solver error in line 814. please help me to get out of this problem.thnx

bugra · August 12, 2010, 06:29

Hi Nawaz,

You can reduce under-relaxation factors a little for the turbulence parameters.

After convergence begins, you can increase them again according to circumstances.

matthewsun · August 14, 2010, 12:01

Usually it wont help change the under-relaxation factors. Better check the BCS carefully.

August 11, 2010, 23:57	Divergence detected AMG solver error	#1
Rub Nawaz Khalid New Member Rub Nawaz Khalid Join Date: Aug 2010 Posts: 1 Rep Power: 0	hi all friends me a student n m using Spar-Almars model for computing flow on an airfoil NACA 2415 at mach 0.6 angle of attack 4degree during ittration the solver show error tha divergence detected AMG solver error in line 814. please help me to get out of this problem.thnx

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August 12, 2010, 06:29		#2
bugra Member B. Selenbas Join Date: Dec 2009 Posts: 37 Rep Power: 17	Hi Nawaz, You can reduce under-relaxation factors a little for the turbulence parameters. After convergence begins, you can increase them again according to circumstances.

August 14, 2010, 12:01		#3
matthewsun New Member sunqiang Join Date: Nov 2009 Posts: 23 Rep Power: 17	Usually it wont help change the under-relaxation factors. Better check the BCS carefully.