can i clean up a geometry before i run a simulation. i.e. i want to remove some unnecessary features. since the mesh refinement is too fine
No, you can only rescale your geometry or simplify it by splitting (cutting) highly curved surfaces.
@srini_tadepalli - as @Maciek said, there are only basic CAD modification options in SimScale, so you’d need to prepare the CAD model where you designed it or if you don’t have a CAD model at hand, you could give Onshape a spin (www.onshape.com) which comes with a free plan and works also directly in your browser (see also this topic: Using Onshape and SimScale for product design)