I read that you do surface coupling?
Do you support volume coupling too?
Yes, but it will be computationally expensive. preCICE is mainly designed to couple simulations that share a common surface boundary. In this case, all the coupled volume nodes should be specified in the coupling mesh.
preCICE only knows about points and their connectivity, so it doesn’t make much of a difference if the points are on a surface or on a volume. However, in the case of volume coupling, nearest-projection mapping would not be available. You may still use the nearest-neighbor or RBF mapping, however.
Moved from our FAQ on precice.org.
For the OpenFOAM adapter, there is an open Pull Request for supporting volume coupling: https://github.com/precice/openfoam-adapter/pull/97
Feedback or further work on this would be very welcome.
We have volume coupling on the radar and are currently gathering plans, ideas, information and work packages in the GitHub issue 468.
Feel free to participate in shaping this feature!
There have also been talks about volume coupling at the preCICE Workshop 2020:
We have news!
We are actively working on a new linear cell interpolation mapping.
For 2D cases, you will be able to define a triangular mesh and configure preCICE to interpolate inside the cells
For 3D cases, we plan to add support for tetrahedral elements to both the API and the above mapping.
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More updates on volume coupling:
- We recently finished developing a partition-of-unity RBF data mapping. This should be a game changer for volume coupling.
- Rethinking and properly evaluating our communication backends for volume coupling is also on our roadmap.