How to use axisymmetric models in precice

Using preCICE
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1

Hi, I’m using openfoam and calculix to simulate fluid-structure coupling.
The axisymmetric model used by openfoam is a quasi 2D model.Axisymmetric element CAX4 for calculix.Both models are in the xy-plane and the z-axis is out of the plane.

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The red line indicates the surface of the data exchange, which is actually a line.
The error is reported as follows:
ccx_preCICE: adapter/PreciceInterface.c:559: PreciceInterface_ConfigureNodesMesh: Assertion `count == interface->num2DNodes && “Filtering of 2D nodes not done properly. Please make sure the out-of-plane axis is Z-axis”’ failed.

Please, any suggestions on how to solve this problem? I’ve also checked the forums for related issues but still don’t understand how to solve it, thank you very much!

2

Are you using 2D or 3D coupling meshes in preCICE? Is the solid model 2D or 3D?

3

Thank you for your reply. :smiling_face:
I use 2D coupling meshes in preCICE.
The solid model is quasi two dimensional.CalculiX expands axisymmetric elements to one layer of 3D elements in a 2 degree sector.
Both calculix and openfoam can only simulate 3D models, but there is only one layer of mesh in the z-direction, so they can be viewed as quasi 2D models.
What can I do to solve this problem?

4

I would try to go fully 3D in terms of preCICE meshes here. OpenFOAM has special treatment for such wedge-shaped meshes, but preCICE does not.

5

Hello, I’m also studying this issue recently. Are you still using axisymmetric model using wedge grids and CAX4 element? I’m having some trouble with this. The results I got using this model feel that they do not match the actual situation. Can you discuss it?