Need some advice in using two mesh types in NITF and CHDS

Hi. I've been doing a 3D simulation for the past couple of months on the heat and mass transfer of some granular materials.. One domain for the fluid and several domains for the granular materials. But I have some issues on the coupling of NITF and CHDS because of the type of mesh that I am using.. Without coupling, the NITF can only work best (in my case) with tetrahedral mesh for the whole domains while the CHDS can both work best using the same tetrahedral mesh together with several boundary layer mesh in some domains. But coupling the NITF and CHDS using both tetrahedral and boundary layer mesh, COMSOL is almost not running.

Is there a way to assign the mesh type to each physics? I mean assign only tetrahedral mesh to NITF and both tetrahedral mesh and boundary layer mesh to CHDS? Need some advice, please.
Thanks in advance.

Jonathan