Help with STAR CCM solution diverges

Gui92200 · April 23, 2020, 10:29

Hello,

I have an problem on my simulation on STARCCM. Everything seems to work fine until I have some issues (check the picture). I can see that the solution diverges at one moment.
The problem is that the calcul time is already huge and I can’t use a thiner mesher.

The system tested is a system aiming at separating oil and gaz from a melange with a rotor rotating at 10000 rpm.

Here are some technical feature I used to run the simulation :

Physics Models :
Segregated flow (VOF)
Multiphase interaction
Implicit unsteady
Three dimensional
Two Layer All y + wall treatment
Gravity
Exact wall distance
Gradients

Volumic mesher :
Surface remesher,
automatic surface Repair
Tetrahedrale Mesher
Prism Layer Mesher

Base size 0.005
Pert Part meshing
Surface curvature 90

Help appreciated !

Thanks

Guillaume
94072230_760358784495040_6253028966257393664_n.jpg

ping · April 24, 2020, 01:40

vof is not really the correct multiphase model for separation although there are some recent additions that might help a little. i suggest you use eulerian multiphase - the help explains what the wide range of multiphase models are good for.

April 23, 2020, 10:29	Help with STAR CCM solution diverges	#1
Gui92200 New Member Ducreux Join Date: Apr 2020 Posts: 1 Rep Power: 0	Hello, I have an problem on my simulation on STARCCM. Everything seems to work fine until I have some issues (check the picture). I can see that the solution diverges at one moment. The problem is that the calcul time is already huge and I can’t use a thiner mesher. The system tested is a system aiming at separating oil and gaz from a melange with a rotor rotating at 10000 rpm. Here are some technical feature I used to run the simulation : Physics Models : Segregated flow (VOF) Multiphase interaction Implicit unsteady Three dimensional Two Layer All y + wall treatment Gravity Exact wall distance Gradients Volumic mesher : Surface remesher, automatic surface Repair Tetrahedrale Mesher Prism Layer Mesher Base size 0.005 Pert Part meshing Surface curvature 90 Help appreciated ! Thanks Guillaume 94072230_760358784495040_6253028966257393664_n.jpg

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April 24, 2020, 01:40		#2
ping Senior Member Ping Join Date: Mar 2009 Posts: 556 Rep Power: 20	vof is not really the correct multiphase model for separation although there are some recent additions that might help a little. i suggest you use eulerian multiphase - the help explains what the wide range of multiphase models are good for.