In my model in icepak, I have some velocity fluctuations that I want to resolve properly. Therefore, I want to use non-conformal meshing via assembly for that area. The problem is, however, that area is just fluid, no object or whatsoever. 

I tried using block objects of type "fluid" on that area, but the flow goes around that block as if it's a solid object or it has walls.

Is there any way to create an assembly where there is only fluid, no object or whatsoever?