[cmpxNerd]

Hey,

I'm working on a case inspired by the OpenFOAM propeller meshing tutorial (https://develop.openfoam.com/Develop.../RAS/propeller), and I’m facing challenges due to very small clearances between the propeller and the surrounding geometry.

Details of my setup:
1. The propeller is mounted just 0.5mm above the base of the vessel.
2. There is only a 1mm clearance between the maximum propeller blade radius and the enclosing cylinder wall.

Given this very limited clearance, I’m struggling with implementing dynamic meshing (how to define AMI). Fine refinements around the propeller are noticeably affecting the outer mesh (the bottom base of cylinder removed and cavity after meshing due to very small clearance), resulting in poor overall mesh quality.

Could anyone share advice or strategies for improving meshing quality in such a tight clearance scenario? Specifically, I’m interested in tips for dynamic meshing configurations that could minimize distortion in the outer mesh while maintaining adequate detail around the propeller.