Ansys Employee

Domain is the generic term for whatever you're modelling. So in this case, the CFD mesh/geometry. 

Just a note, anything modelled using Student MUST be for your learning, and is therefore not confidential. Anything modelled with Research level licences is (technically) supposed to be published at some point. For commercial type or very confidential projects you should be using the Commercial level licences. Please discuss with your supervisor to make sure you're not accidentally outside the terms. If you're at all unsure please contact Ansys.