gradient source term UDF
I have a user defined scalar for a variable Q, and a user defined scalar for a variable V. In the scalar equation for Q, a source term appears as follows:
where the variable Q appears as a source term for the user defined scalar equation for V as (Q/constant). Everything works beautifully when I turn this source term (eq 1) OFF.
The way I implemented this source term (equation 1) is within a DEFINE_SOURCE function as
and the solution diverges. I am pretty sure this is because of a checkerboarding effect as with pressure-velocity coupling. I therefore probably need to manually discretise the source term in the FLUENT UDF environment...how can I access north,south,west and east nodal positions so that I can do this in 2D?? and later in 3D? is this even possible in fluent?? This has been troubling me for quite some time now...any help is appreciated.
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