Can I use coupled solver for this problem

Frank

Hi, I need to solve the fluid flow and heat tranfer in a nozzle, the wall of the nozzle is cooled by water, the hot gas flows through the nozzle. So, for the hot gas, it is compressible, for the coolant water,it is imcompressible. I know the segregated solver can solve this two fluids regions together(hot gas+wall+water). Can I use the coupled solver to solver this problem? If not,why?

Thanks! Frank