Moving Mesh Issue

Masum Alam · July 17, 2025, 14:26

Hello,
I am trying to simulate Purcell swimmer(a special type of microswimmer) in fluid. I already defined the physics and boundary condition using laminar flow and multibody dynamics module. The main problem I am facing is with the moving mesh algorithm. As the swimmer is rotating by a significant amount (120 degrees), the mesh distortion increases over time, which eventually leads to a non-convergence issue and the inversion of mesh elements. At this point I am exploring other methods like immersed boundary methods, overset meshing, level set methods, but it seems like COMSOL doesn't have these features.

Any suggestions regarding better meshing would be appreciated

Thank you

Lorenzo210 · July 24, 2025, 04:45

Hi,
You could try to use Automatic Remeshing. You can set the limit of mesh quality over which COMSOL stops the simulation and re-build the mesh. It's more time consuming, but it would solve the problem of having inverted elements.

Best,
Lorenzo

July 17, 2025, 14:26	Moving Mesh Issue	#1
Masum Alam New Member Masum Alam Join Date: Dec 2024 Posts: 2 Rep Power: 0	Hello, I am trying to simulate Purcell swimmer(a special type of microswimmer) in fluid. I already defined the physics and boundary condition using laminar flow and multibody dynamics module. The main problem I am facing is with the moving mesh algorithm. As the swimmer is rotating by a significant amount (120 degrees), the mesh distortion increases over time, which eventually leads to a non-convergence issue and the inversion of mesh elements. At this point I am exploring other methods like immersed boundary methods, overset meshing, level set methods, but it seems like COMSOL doesn't have these features. Any suggestions regarding better meshing would be appreciated Thank you

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July 24, 2025, 04:45		#2
Lorenzo210 Member Lorenzo Join Date: Apr 2020 Location: Italy Posts: 58 Rep Power: 7	Hi, You could try to use Automatic Remeshing. You can set the limit of mesh quality over which COMSOL stops the simulation and re-build the mesh. It's more time consuming, but it would solve the problem of having inverted elements. Best, Lorenzo