[Juli]

Hello everybody,
I have set up a 2-way FSI Simulation. I can start it without any trouble if Multiphase is off. But as soon as I choose Volume of Fluid (2 Phases; Formulation->Implicit; Interface Modelling/Type->Sharp) the simulation doesn't start anymore.
Phase1->air
Phase2->oil
PhaseInteractions-> shear stress constant value

Following appears in the Fluent solution information:
[...]
Preparing mesh for display...
Done.
　
Setting Post Processing and Surfaces information ... Done.
Initialization based on settings...
Deleting Client...done
Shutting down Server...done
Error: Rpc Communication failure during SyncManager:YieldToken call at cortexmpc.c:294
[...]

I think it must be a problem with initialization. I use Standard Initalization and patch a region afterwards.

Of course I can provide more detail about the setup if needed.
I'm happy about any help.
Thanks a lot in advance,
Juli

[Ahmed Alkaisi]

Try PISO and hybrid intialization

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[Juli]

Originally Posted by Ahmed Alkaisi

Try PISO and hybrid intialization

Sent from my SM-G900I using CFD Online Forum mobile app

Thanks, I had tried PISO already because in ANSYS Help it says it would be the best for problems like mine. The hybrid initialization did not bring any change.

[Juli]

Maybe the geometry is the problem. I figured this out because I actually could solve it one time with Multiphase, but than the moving part moved so much, it hit the wall. So I changed the geometry. And with the very same settings it doesn't work anymore.
I attached a picture of both, the body which I can calculate without trouble to initialize (cube) and the body with which fluent shows the error as written above (cube_modified). Under the blue line is more or less where liquid is and above it is air.
Any hints what could be wrong with my geometry?

Thanks a lot in advance.

Cube.PNG

Cube_modified.PNG

[Ahmed Alkaisi]

Try different mesh method (cell cut)

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