We had a chat today, and you mentioned you want to perform an internal CFD analysis, however, this type of application is an external simulation. So forget about the internal CFD tutorial I sent you You will have to create an External flow region in CAD mode instead, as in the following tutorial:
Here is a guide for the CAD mode:
Also, you will need to create a Convective Heat Transfer ( not plain Heat Transfer, this is not a CFD analysis).