Parralel Computation License Issue
 

I'm using the Teaching Introductory Student Ansys 16.2 License.

When I open fluent using parallel and selecting 4 cores, it runs fine.

However, when I choose six it says there is a license issue and all I can do is hit enter to close fluent.

Is this just because I'm using the student version and the number of cores is limited or is there some other issue?

yes, to use more than 4 cores you need HPC licenses. With just teaching, 4 is the max (and, if I'm correct, meshes are limited to 512k cells)