September 3, 2024 at 1:10 pm
Rahul
Ansys Employee
  1. What Dynamic Mesh settings are being used in Fluent? Try Tetra-hedral cells to enable remeshing with the Unified Remeshing methods.
  2. I guess you are using liquid as working fluid.  Make sure your material is set as a compressible liquid. An incompressible fluid will have infinite sound speed, which in cases with deforming fluids can lead to pressure spikes at the FSI interfaces resulting in excessive deformation. If you still experience high pressure oscillations at the FSI interface, consider using Solution Stabilization 12.6.9.8 Solution Stabilization for Dynamic Meshes Boundary Zones (ansys.com)