[Diwei Liu]

hello,
now I have a question in how to add the source term of the poisson eqn in the UDF. eqn is
b* laplacian rho = - rho /a ;
while a and b is constant . it is just like a scalar transport equation. I just use the DEFINE_SOURCE macro like this：
DEFINE_SOURCE(source0, cell, thread, dS, eqn)
{
real d = 0.001 ;
real source ;

C_UDMI(cell,thread,0) = C_UDSI_M1(cell,thread,0) /d/d ; // the right part of the eqn

source = - C_UDMI(cell,thread,0);

return source ;
}
result is bad

maybe I am not sure about how a source term is working .
I really need you help !
thank you!

[Diwei Liu]

I have fixed it ，thank you for click！