Hello precice-developers and -community,
after testing my DUNE-adapter with the flexible flap tutorial in 2D/3D, some further programming
and validation, I wanted to give the “lid-driven cavity with flexible bottom” scenario a try.
The scenerio looks like that, but is in 3D:
The velocity of the to wall is given as: vbar = 1-cos(2pit/5)
I found an openFoam configuration of that case in the mbdyn-adapter section that looks quite
good (despite the fact that the last update was done over a year ago). I created the mesh for the bottom wall, that represents the membrane, with linear 8-node hexa elements and one element over the thickness. The nodes of fluid and solid mesh coincide. The first 5s of the simulation run fine and look similar to the expected results. My problem is that the deformation of the membrane is just increasing and no oscillating behavior is occurring.
The picture shows the overall membrane displacement in y-direction (left) and additionally the y-displacement of the membrane-midpoint over the simulation time (right):
After 10s the simulation crashes, due to the huge deformation of the mesh. Additionally, the effect of the time-dependent velocity of the lid can be slightly seen at 5s.
Maybe someone has experience with that case and can give me some tips how to model the membrane/bottom wall properly or might has some ideas what could be the problem.
Just for completeness the precice-config:
precice-config.xml (3.2 KB)
Thanks for your help,