I have a problem with sticking nodes on the FSI interface of preCICE 2 and OpenFOAM/CalculiX:
I try to model a valve case with a flexible disc closing a circular orifice by increasing pressure. On the OpenFOAM side I have the problem that 2 nodes stick in their original position directly from the beginning and don’t move with the FSI-interface. In the point-displacement file it seems they get all the time no displacement, even the CalculiX displacements look smooth.
I tried a number of different meshes (element type and resolution) and different mapping options (nearest neighbour and nearest projection). Also I tried with displacements and displacement deltas. In the initial state, the surfaces are plain and geometrical identical (no gap between CCX and OpenFOAM part). Writing out the FSI-interface in vtk from preCICE it is obvious that there are 2 points without displacement as shown on the figure (almost in centre of the disc all time). Any ideas how to fix this?