A material device such as an internal fan, distributed resistance, blower, or rotating region material cannot be applied to a part. (Clicking the Apply button on the Material Quick Edit dialog does not do anything.)
The likely reason is that the part does not touch a fluid part. Material devices obtain their material properties from adjacent fluid parts. If there is an ambiguity (such as neighboring parts that are all solids), Autodesk® Simulation CFD prevents the material from being applied to the part.
To resolve this issue:
Ensure that one or more fluid parts are adjacent to the part in question. (Note that any fluid parts touching a material device part should be assigned the same fluid material.)
Products: Simulation CFD