Multiphase FSI case with the OpenFOAM adapter

[Makis]

Hi @raynold_tan,

@raynold_tan

I noticed that the pressure forces are calculated by searching for the ‘p’ variable at the beginning. However, in the case of interFoam, p_rgh is defined inside the 0 folder. I am not sure if this will cause any issue with the coupling. That we should use the p_rgh variable instead of the p variable?

yes, you need to ask interFoam to use p_rgh as the temperature name. It should then use that as a pressure field:

precice/openfoam-adapter/blob/f521d3c9308b2b75d1e4232ec59a3a38ceb0a7c1/FF/Pressure.C#L8-L10

You can do that by adding nameP in your preciceDict, similar to these instructions: Configure the OpenFOAM adapter | preCICE - The Coupling Library

I realized we have not yet documented this option, but you can find out the exact option by looking at this part of the code:

precice/openfoam-adapter/blob/f521d3c9308b2b75d1e4232ec59a3a38ceb0a7c1/FF/FF.C#L58-L60

I opened a related issue to update the documentation with everything FF-related soon.

Other than that, maybe people that have done similar multi-phase simulations in the past (e.g., @Jianzhou722, @Alphaoo1, @bitronteofil, or @Michael) could also help here. See also a few related topics:

• FSI with interFoam and CalculiX: Convergence
• FSI with interFoam and CalculiX
• FSI: OpenFOAM adapter with interFOAM
• OpenFOAM adapter for InterFoam: Density in Incompressible flow