divergence transient study
I am performing a transient study and after 3000 iterations it takes place a divergence of residuals and so my results...
Courant Number 0.1 (which works perfect)
Time Step Size = 0.1 seg
Number Steps = 5000
Max Iter/ Time Step = 50
Everything runs well and behaves as supposed but when it reaches 3000 iterations....diverges!
Any advice?? is there anything else I can do??
Thanks in advance
Plz Increase the maximum coarse level under multigrid panel (Advanced solution control)
and lets see its works or not.
I will do it, thanks
I set even 10000 in max coarse and it didn't change at all the results...
no, even 10 is sufficient. 10000 is not correct(unreal). u can play with multigrid option. (pre sweeps, post sweeps) . hopefully it will help.
r u using explicit method to time advancement? ( u set courant no 0.1.)
try using implicit method and please post whether it is working or not.
yes I am using implicit method (itīs default) , and it gives me the possibility to set courant number. I have tried from 0.1 to 5 (0.1 more precise but slower and 5 very coarse)
max coarse number didnīt affect my calculations nor residuals.
I am going to surf this site and Iīll let you know!
Plase don't make different thread for same problem as i think u have two or three threads for this problem. its confusing, right!!.
yeah sorry some times I get confused with this forum... sorry about that! no happens again
Try reducing the time step size and simultaneous reduce the URF
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