Karthik R
Hello,nCan you not disable the solid part of the geometry in your Fluid simulation? This way you won't have a wall and wall-shadow regions in your Fluent simulation and will have just one single wall. nIf this doesn't work for you - then you could try to use the surface with the 'fluid' adjacent cell zone. You should be able to see this in your wall boundary condition panel. One of the wall or wall-shadow should be the boundary adjacent to the fluid cell zone and the other should be solid. You should use the boundary next to the 'Fluid' region for data transfer.nI hope this helps.nKarthikn