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Hi, it should work. It works here in testing, at least back to version 2022R2. C_MU_T is the turbulent viscosity for k-e, k-w and transition SST models. Have you hooked your UDF function into the meaterial properties for the UDS diffusivity? You could add the line
Message("c_mu_t = %e \n", C_MU_T(c,t));
to your UDF and run for 1 iteration to see what is happening. Only macros documented in the Customization manual are supported.
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