I have a similar problem and was just about to post it, so instead i'll share on your post if that's alright by you.
I'm working on a propeller with two blades, and can't find a way to make a denser mesh around the blades. Using mesh 3D view we can see that mesh is pretty poor on the rotor.
I've tried playing around with initial mesh but what I get is as show in the picture :
it seems not to affect the meshing on the object :s
Is there a better way? Is it possible perhaps to create some sort of a "phantom" solid that contains the propeller within its volume and to mesh the object? It's possible with sw simulation with a dedicated "mesh" button but can't seem to find one in flow...
You can use local mesh regions to get finer resolution. What I do in these cases is to create a part that represents the local mesh. When you create the local mesh in Flow Sim you can tell the software to ignore the part when calculating physical geometry.
Pratham, you have to remember that Flow Sim has a limit on cell division, you can only go up to 8 refinements from the size of the basic mesh cells. If you need smaller cells and you are at the refinement limit you will have to manually change the parameters of your basic mesh to get smaller "refinement 0" cells to start with.
By adding part you mean creating a solid object in the same part of the propeller (without merge, covering the volume of the prop, transparent color) or creating an assembly of the propeller + mesh part and running flow sim on the assembly?
Thanks for the quick response!
EDIT: Worked it out, thanks for the tip!