Gaurav_ANSYS I have the both situations: 1 Modell with 3 parts; i change the covers and the body is the same to get assembly 2. in the middle is the same part and i start ADL with inside fluid-option. ADL build the negative shape from CAD-geometry an mesher it. in the first I get a mesher-situation and these is not the same mesher-situation from asm2. I have now make the negative site of geometry in CAD-tool and import these body and marks only the surfaces for inside and outside.