|October 22, 2012, 15:59||
Strange residuals of the Density Based Solver
Join Date: Apr 2010
Posts: 58Rep Power: 8
I have trouble in the interpretation of the residuals of the Density Based Solver. I started the first simulation with a coarse grid and - after the continuity stopped to converge at ~4e-3 - I interpolated the solution on a finer grid and started the simulation again. At the start I realized that I forgot to interpolate the solution of the coarser grid and so I interpolated it after 128 iterations. The residuals of my species made a big jump to 1e+20 and stay now at 1e+17. The other residuals are now between 1e-3 and 5e-3, but the calculation is still not completely converged. I never saw such a phenomenon with the Pressure Based Coupled solver and the residuals on the coarser grid were also lower with this solver ( between 5e-6 and 3e-8 ).
I am using the Density Based Solver and the Pressure Based Coupled solver, because I calculate a supersonic flow (M~2.2).
Do anyone know the reason for this residual-phenomenon and why they are still so high? And perhaps the reason, why the residuals of the Desity Based Solver - in my cases - are always greater than the residuals of the Pressure Based Solver?
Thank you very much!
|Thread||Thread Starter||Forum||Replies||Last Post|
|Pressure based and Density based Solver||Xobile||Main CFD Forum||20||January 25, 2016 04:50|
|Pressure and density based solver||JOKER||FLUENT||0||February 18, 2011 10:58|
|Density based solver with cnst density!||p_agoodboy||FLUENT||0||November 8, 2010 23:18|
|Boundary face values in density based solver?||Chen Zhi||FLUENT||2||May 12, 2008 02:20|
|Segrgated vs pressure based solver||Soubhik||FLUENT||0||February 27, 2008 07:55|