Filling Holes
 

I have a cable in the middle of my model and there is an outside boundary. When I change dimensions of my cable (via Transform-->Scale), an empty space around the cable is created as well. That means there is a gap between boundary surface of the surroundings and boundary surface of the cable itself. I couldn't find any solution to this problem. The parts are imported into Geometry-->Parts.

P.S. I'm a novice at using STAR-CCM+.