CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   Divergence detected in AMG solver (http://www.cfd-online.com/Forums/fluent/98121-divergence-detected-amg-solver.html)

Musa March 3, 2012 17:47

Divergence detected in AMG solver
 
My simulation has broken down and i am receiving a message saying divergence detected in AMG solver:vof1-increasing relaxation sweeps. Anyone help me

cfd seeker March 4, 2012 06:47

Mate reduce the courant no and also the under relaxation factors at the start of simulation, once your solution gets stabilized then increase the courant no. The low the courant no. the more your solution will be stabilized but solution will take longer time to converge and vice-versa

Musa March 4, 2012 10:15

cfd seeker thanx for your suggestion but i am using the implicit solution so the courant number is not applicable and yes i have tried to reduce the under relaxation factors but it has not of much help.

cfd seeker March 4, 2012 13:40

Implicit scheme is very very unstable and has very strict conditions on the time step size. Courant no can be changed in the implicit scheme also. Its default value is 1 and you can reduce it.


All times are GMT -4. The time now is 11:53.