Invalid cp problem occurs in my fluent window. If I change cp of one material then same error occurs due to other. Is it a problem of mesh? Or any other problem.
I will recommend somethings about your questions. First of all, check your material properties of air (which one do you used polynomial or constant properties of air), after that check your mesh (what is the mesh quality (aspect ratio, skewness, and orthogonal quality). If you did all these parameters above, check your limatations of fluent.