HELP！How to define this kind of inlet concentration in transient solver?
I run a transient simulation of species transport, and the concentration of each species at the flow inlet should be prescribed according to the following relation:
dc_in/dt = A*(c_out - c_in),
where A is a constant, c_in and c_out are the average values of concentration at the inlet and outlet boundary. How to write this kind of relation (dc_in/dt = ...) in UDF?
Thand you very much!
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