How to get the same standard k-epsilon as CFX?

The standard k-epsilon in Fluent differs from original standard k-epsilon by the fact that production of k differs:
Gk=mu_eff* S^2 (for incompressible flow)
instead of
Gk=mu_turb* S^2 (for incompressible flow)

mu_mol= molecular viscosity
mu_turb= turbulent viscosity
S= strain rate magnitude

Note that for epsilon source term C1epsilon*epsilon/k*Gk=C1epsilon*rho*Cmu *k*S^2,
with Gk=mu_turb* S^2

You can retrieve the original behavior of standard k-epsilon which is coded in CFX with the following UDF:

#include "udf.h"

/* UDF to retrieve standard k-epsilon production */

DEFINE_SOURCE(k_source_mu_lam, c, t, dS, eqn)
real G_k;


return G_k;

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