Hi, I would like solved two user defined scalar. In first uds diffusivity is constant egual 1 and second uds diffusivity is variation specified as user defined function. How do it to this two user defined scalar solved together??? Best regards Tomik.

In the DEFINE_DIFFUSIVITY macro you can use the index number of the scalar (passed by the solver) to return an different diffusivity for each scalar.

RoM

Thanks for your help.