Problem with UDF
 

while passing from the average of Reynolds to the average of Favre in compressible flow,there is a new term which appears "interaction of the field of pressure with the fluctuations of density", I want added this term "source" on FLUENT, I defined it as source term for the 6 components of the tensor of Reynolds stress and I stuck each source term to the ¦fluid, terms source" on FLUENT, but does not go, how to make?