Thank you for taking the time to reply to this post!
I have updated the global mesh set up with the following parameters:
The clearance is 1mm, so the thought process is to have 4 elements in the gap and so the min size limit was set to a quarter of the gap size.
The part mesh set up is as:
The volume mesh set up has been set as follows:
The edge criterion is set to 0.001 in order to attempt to capture the sharp trailing edge of the blades.
However, I found the Octree method does not seem to be suitable for this geometry as running the cutter took hours. I eventually interrupted it in favour of a bottom up approach.
Using an All Tri, patch independent method, I attempted to begin by creating a surface mesh of the impeller. However, the method seems to have difficulties capturing the sharp trailing edge.
In general, the quality of the surface mesh was quite low (min quality approx 6.9e-7), even though I believe it to be sufficiently refined (if not too refined). I used a Lagrangian smoother, but there was no noticeable difference in quality.
Does anyone have any advice on how I can proceed or guidance of where to look for information?