[ypchen]

I need to solve a equation by using the UDS in FLUENT, the form is :
d(R)/dt=S where "d" is the partial derivative, S is the source term,and R is the variable I want to solve, that is, the diffusion and flux terms are zero. How do I define it by the UDF code ?If the variable is density, according to the UDF manual,I want to know if I can set the "phi" (in UDS transport equations ) to be 1. if not, how can I delete the density in the unsteady term ? Thanks Y.P. Chen

[niravtm007]

hiii friends i am entirely new to using udf's in fluent. I have a cubical geometry, with two inlets on perpendicular adjacent faces. i have to implement udf to only one of the conditions.
i have two cases
1) parabolic velocity inlet ( space varient)
2) sinusodial velocity velocity inlet ( time variant)
can any one pls send me the udf ( codes) ...