[mary24]

Hi, I hope this forum can provide me some help.

Can I know how to write a UDF to set the boundary condition of my UDS to specified flux? I know have to use DEFINE_PROFILE and F_PROFILE, but what about the equation? I am following a paper but I am facing some convergence issue.

Does the equation to set as specified flux of UDS has any specific units? I read from Fluent User Guide that "If you select Specified Flux in the User-Defined Scalar Boundary Condition group box for a particular UDS, then your input will be the value of the flux at the boundary (that is, the dot product of the negative of the term in parentheses on the left hand side of Equation 1.9 (in the Theory Guide) with the vector that is normal to the domain)". Can anyone help to explain this in further details?

Thank you in advance.