Residuals problem
Hello everybody!!! I have a problem with the continuity's residual convergence.I use the kepsilon realizable model and I have about 17000 cells. The calculation converges very well at the beginning of the calculation but just before the half of the calculation, the continuity's residual gets instable and doesn't converge. For information, the underrelaxation factor for pressure is 0.3 and 0.7 for the momentum.I have 200 time steps of 5e4 seconds and 1000 iterations per time step. If anybody has an idea, he will be welcome. Thanks!!

Re: Residuals problem
I think you should try to reduce the under releaxation factor as per the manual.

Re: Residuals problem
0.2 for the pressure 0.5 for the momentum,k and epsilon?

Re: Residuals problem
yeah may be

Re: Residuals problem
You should keep your pressure and momentum urf's equal to 1. So if pressure = 0.4 momentum = 0.6.
This was discussed in this forum sometime ago but I can't remember under what heading, sorry. Eric 
Re: Residuals problem
i think the sum should be 1.0 only for the SIMPLEC method as I understand in the FLUENT guide

All times are GMT 4. The time now is 11:18. 