[wind]

Dear all,
I meet problems of defining source term in UDS. I want to solve a UDS, and the scalar equation has four terms. Beside the unsteady term, the convective term, the diffusion term, and a extra term expressed as -ə(Aφ)/əxi is left, where φ is the unknown variable to be solved, A is the constant. My questions are:

1. whether the extra term -ə(Aφ)/əxi could be treated as the source term of UDS?

2. If so, how to give the source and ds[eqn] in UDF?

source= -A*(C_UDSI_G(c,t,0)[0]+C_UDSI_G(c,t,0)[1]+C_UDSI_G(c,t,0)[2]); /*is it right?*/
dS[eqn] = ?;

thanks!