Ansys Learning Forum Forums Discuss Simulation Fluids Source term derivative in Fluent UDF DEFINE_SOURCE(MOMENTUM, c, t, dS, eqn) Reply To: Source term derivative in Fluent UDF DEFINE_SOURCE(MOMENTUM, c, t, dS, eqn)

Rob
Forum Moderator

It tends to help, but isn't required. dS[eqn] = 0.  is used in a few of the examples.Â