source term units - poission equation
 

Hi All,

I am solving negative ion conc equation (UDSI -0) and potential difference equation (UDSI-1). I have a problem in UDSI-1 source term.
The equation is => del^2(phi) = (e/epsilon)*UDSI-0
the units are => Volt/m^2 = Volt-m*(ions)
to make units consistent i devided RHS with C_VOLUME(c,t) hence it beocmes Volt/m^2 = Volt/m^2
but when i devide with cell volume UDSI-1 is diverging.
Could you please help me with this problem.