# Multiphase

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 June 29, 2016, 07:29 #21 Member   Join Date: May 2015 Posts: 34 Rep Power: 8 Hi, you haven't set any residualControl to PIMPLE as I suggested earlier: Code: `PIMPLE: no residual control data found. Calculations will employ 3 corrector loops` From my experience, this leads to high initial residuals and funky results. If you check your average particle volume fraction (alpha.particles volume fraction = x), you see that it increases constantly, ie. your system is generating mass! Again, to reach a converged solution, add residualControl to PIMPLE, there are several examples available for example here

June 29, 2016, 07:42
#22
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Asmaa
Join Date: Mar 2016
Posts: 94
Rep Power: 7
Thank you for your fast reply .

Please find attached my fvsolution, I've modified it, is it ok or i should add something else?
Attached Files
 fvSolution.tar.gz (800 Bytes, 42 views)

 June 29, 2016, 11:28 #23 Member   Asmaa Join Date: Mar 2016 Posts: 94 Rep Power: 7 Yes it seems that my system is generating mass!!! so what can I do to solve this problem?

 June 30, 2016, 02:20 #24 Member   Join Date: May 2015 Posts: 34 Rep Power: 8 You need to make your simulation converge. Try it with your new fvSolution settings and you should see a difference.

 June 30, 2016, 06:55 #25 Member   Asmaa Join Date: Mar 2016 Posts: 94 Rep Power: 7 Yes it converges now!! thank you very much Please do you have any idea about how to calculate torque and forces in multiphase, because with simpleFoam I use functions ( forces { type forces; functionObjectLibs ("libforces.so"); outputControl timeStep; outputInterval 1; patches (wall_impeller_1 wall_shaft-fluid_tank wall_shaft-fluid_mrf_1); pname p; Uname U; rhoName rhoInf; log true; rhoInf 998; CofR (0 0 0); } ); But when I use it with multiphase case, I get this error: --> FOAM FATAL ERROR: No valid model for viscous stress calculation From function forces::devRhoReff() in file forces/forces.C at line 258. FOAM exiting

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