Since case is at low velocity the fluid is incompressible (constant density). No ideal gas formulation and energy equation is off. I tried with far fields and ideal gas but since the flow is so slow it is difficult to converge and produce good results. 

The static pressure plot is the result of when the velocity at inlet is a 15m/s. This means that the udf works and the velocity increases as desired. the problem is that the static pressure result is not making physical sense. 

now i'm looking into differences between udf s ran in serial or parallel fluent setting since apparently it does make a difference, but it is just another thing i m trying after many others.

My domain might be a bit small but i don t think it effects the problem, what do you think?

Maybe you've encountered a similar problem somewhere and can point me in the right direction.

Thank you.