which combustion model can be in supersonic field
 

Hello I want to use fluent5 to anlyse the combustion in supersonic field,but I don't konw which combustion model work well in supersonic.By the manual,the PDF model can'n used in compressbile fluid.I use finite rate(eddy dissipation)model and thane-air species, but the result is not correct,there is no product in the field.

How can I do ? Any help is greatly appreciated.