Divergence

September 27, 2002, 15:23

I have this error when i do my simulations. what does is mean? "divergence detected in AMG solver: temperature"

How to i manipulate the pressure, density, body force, momentum, liquid fraction update, and energy under-relaxation factors to improve my convergence?

Please help.

September 29, 2002, 00:58

try to decrease the under relaxation factors in case of segregated solver,courant number in case of coupled solver.

sri

October 1, 2002, 11:28

How do the INDIVIDUAL under-relaxation factors 1) Pressure 2) Density 3) Body Force 4) Momentum 5) Liquid Fraction Update 6) Energy

work towards convergence. By reducing, what should be the correct combination. Like for example, in the Fluent manual, it is suggested that the pressure should be set to 0.2 and momentum 0.5

Please help. I cannot get the simulations to converge.

September 27, 2002, 15:23	Divergence	#1
June Guest Posts: n/a	I have this error when i do my simulations. what does is mean? "divergence detected in AMG solver: temperature" How to i manipulate the pressure, density, body force, momentum, liquid fraction update, and energy under-relaxation factors to improve my convergence? Please help.

September 29, 2002, 00:58	Re: Divergence	#2
sri Guest Posts: n/a	try to decrease the under relaxation factors in case of segregated solver,courant number in case of coupled solver. sri

October 1, 2002, 11:28	Re: Divergence	#3
June Guest Posts: n/a	How do the INDIVIDUAL under-relaxation factors 1) Pressure 2) Density 3) Body Force 4) Momentum 5) Liquid Fraction Update 6) Energy work towards convergence. By reducing, what should be the correct combination. Like for example, in the Fluent manual, it is suggested that the pressure should be set to 0.2 and momentum 0.5 Please help. I cannot get the simulations to converge.

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