Coming back to you with some suggestions. Your mesh is currently quite large at 20 million cells so the first thing is do not enforce a surface refinement of (min,max) = (3,3) for the fluid and solid volumes. Instead try (0,3) which will allow for the non-curved areas to be more coarse and reduce your mesh size.
Next I can suggest another refinement to be added to the curved faces
If there is face just on the lowers curved sections you can try an overall refinement of (4,4), otherwise apply the refinement to the entire face and use (min,max) = (0,4)
Let’s see if that improves things.