Hello,
I actually try to extent a Liggghts simulation to a coupled simulation with CFD. In my Liggghts simulation I got a rotating disk, where the particles lay on. Furthermore I ve got a translating lid, which is adding a force onto the particles.
I now tried to add a fluid around the disk, so the particles run in this fluid. Now I face the problem, that the coupled simulation does not identify the moving STL-files I mentioned above.
My question is, if there is any solver in CFDEM, which is compatible with translating and/or rotating STL files (moving meshes). If not, is there any other solution to get a satisfied result within these conditions?!
In the documentation of CFDEMcoupling I found something about a meshMotionModel but there is no other option like "noMeshMotion" is that right?
I appreciate every answer!
Thank you
Kind regard
Aaron
alice | Wed, 01/17/2018 - 09:37
Hi Aaron,
Hi Aaron,
you are right, currently there is no direct way of directly displaying stl-meshes in the CFD calculations. One possibility would be to use baffles or porous zones in the region of the mesh, but when a motion needs to be applied, this will not work out of the box in the public version. Depending on the expected impact of the walls onto the fluid (maybe the rotating base plate is negligible on the CFD-side?) one could try to find work-arounds. Perhaps the translating object could be build up by particles, which are not allowed to move freely but only see a translational motion?
Best,
Alice
Maryam | Thu, 01/18/2018 - 06:49
CFD boundary conditions
If the geometry of the moving boundaries are simple, you can set up the CFD boundary conditions so that they impose a moving wall effect on the fluid. Of course those boundaries must lie exactly on the location of the moving STL meshes in your LIGGGHTS model.