You have several ways to define material properties.
You can appply a solid material on a part using the Engineering database.
Or you can import the material properties you applied in SolidWorks CAD into Flow Simulation (right click.Insert material from model). If the box is empty, it might be because you do not have any material properties defined in SolidWorks?
Thanks for the reply. As you said, I found that there are several parameters not defined in the Solidwork properties, as result i cannot import it for flow simulation.
I was wondering if I could ask another question. Is there any difference between Solidworks for academic under stand alone license and under server license? Both of them are for academic use, but I found that the Engineering database between these license are different. The database for stand alone academic license has very limited materials.