Both viscosity and thermal conductivity can be specified as either constant, polynomial, or Sutherland.
When using constant, Cp must also be specified as constant.
When using polynomial, Cp must also be specified as polynomial. Specifying it as constant or janaf will cause an error.
When using Sutherland, Cp must be selected as constant or Janaf. Selecting polynomial will cause an error. And density cannot use constant or polynomial either.
This issue is a limitation of OpenFOAM’s functionality. We are currently modifying it to prevent confusion when using baram.