About units of mass source term

bg2306

Hello,

I have a question about Source terms (mass) with UDF. I want to simulate a sink for a species on a wall. This sink model seems as c'=k*c. Both have units [kg/m³]. c' is the concentration on the wall and c is the concentration in the air. This means that the concentration on the wall depends on the concentration in the air. I want to write a UDF with macro DEFINE_SOURCE for mass source in Boundary condition of this wall. It is defined as fluid. Because in Fluent, the units of mass source must be [kg/m³s], my question is, how can I change the units for mass source from [kg/m³] in [kg/m³s].

Thanks in advance!

Bin