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Adding a source term in Fluent_(real dS[])

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Old   May 16, 2023, 12:31
Default Adding a source term in Fluent_(real dS[])
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Raja Ganesh
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Hello everyone,

I am new to UDF and I am working on adding a source term to a VOF model. I am trying to understand the "real dS[]" term. On going through the Fluent UDF manual, I understood that this is a derivate term of the dependent variable in the transport equation. But I am not clear about the two options that Fluent provides,
ds[equ] = ds/d(phi) (for implicit)
ds[equ] = 0.0 (for explicit).
Can someone explain, when should i choose the derivate term to be the real derivate and when should i just enter 0.0 as the derivative value? Thanks.
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derivative, fluent - udf, source code, udf code, udf c_vof

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