fuel cell

pour

hi all I don know what is the source terms in fuel cell module in fluent. problem is : 1) fuel cell 2.2 manual dont introduce momentum,mass,species source terms. do you know source terms ? or do you have any reffrence to source terms or b.c. in fluent module ?

2) I write udf but electrical potential equation dont converge to the reason that nonlinear source terms.(J_a or J_c)exponential terms in butler-volmer equation be very larg as magnitude of upper 10^30.

3) I dont know how do I simulate membrane in udf ? how do I set membrane boundary conditionin udf ?

thanks alot sincerely