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July 9, 2009, 07:37 |
gradient source term UDF
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#1 |
Member
Akour
Join Date: May 2009
Posts: 79
Rep Power: 17 |
hi everyone,
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: (Dq/dx)*(DV/dx)*constants (1) 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 C_UDSI_G(c,t,0)[0]*C_UDSI_G(c,t,1)[0]*constants where dS[eqn]=0 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. Thanks AK
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