Strange solution where oscillation stalls momentarily

Using preCICE
1

Hi, I’m running an aeroelastic simulation with the following solvers:
Fluid: OpenFOAM (pimpleFoam)
Solid: OpenFOAM (solidDisplacementFoam)
The setup is very simple: a cantilever 2D beam with some angle of attack. I am expecting some continuous oscillations in the beam, but the oscillations get momentarily stalled as such: (please watch the video until the end)

(the momentary stop takes place between t=0.09s - 0.40s)
The problem seem to be solid solver-related. I’ve been playing with the fvSolution and fvSchemes of the solid solver and I can confirm that this behavior is very sensitive to the numerical setup defined in these two files (the displacement amount and speed change dramatically. also, with certain numeric parameters, there are no oscillations at all; the beam just moves very slowly).
On the other hand, since I’m fairly new to preCICE, some insight on the configuration of preCICE would be very helpful. Any suggestions to where to look for the problem? Specifically, what parameters should I adjust in the preCICE config XML file? Or any other files?
Thanks in advance

2

Hi @hconel,

it looks like the coupling itself is generally working. Have you already validated your flow-only and structure-only setups?

I see you are using solidDisplacementFoam. We have also observed that this solver does not directly compare with the rest of the solvers we support. See some results here:

There is already quite some documentation on the configuration: Configuration overview | preCICE - The Coupling Library Try with a different solid solver first, and then you can dive deeper into details.