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In the Outline window, highlight Materials. In the Materials window, highlight Fluid, and click Create/Edit.... this will launch the Create/Edit Materials window; here we can specify the properties of the fluid. Set the Density to Ideal Gas, the Specific Heat to 1006.43, the Molecular Weight to 28.966. When you have updated these fields, press Change/Create.

ANSYS WB - Supersonic Flow Over a Wedge - Setup (Physics)