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Old   August 19, 2001, 11:33
Default UDS source term
Mark Richardson
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Hello Fluent Users, I am experimenting with the UDF features of FLUENT 5.5 I have coded a UDS:

mr_radius_adjust mr_radius_src mr_radius_dfx mr_radius_bc

These are rudimentary routines and I have set diffusivity to zero for a pure convection condition. This seems to be working okay. However, on my way to this point I was following some guidelines on protective coding and tried to access n_uds in the DEFINE_ADJUST but I do not know which header file to access (even grep'ing for n_uds did not locate a declaration). Another declaration problem is Thread *t0= thread->t0 which also caused compilation problems protecting access in the boundary condition.

Anyway these are not show stoppers and I have coped without them, but any guidance is appreciated.

My next question is: why is the source term for the scalar set within the fluid bcs?

Well thats all for now, I will take this opportunity to thank those who helped me solve the transient analysis problem - I was going the right way after all.

Thanks, Mark Richardson
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Old   August 21, 2001, 04:41
Default Re: UDS source term
Ola Nordblom
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I use compiled UDFs with Fluent 5.5 on both NT and SGI Unix platforms. The variable n_uds is referred to from within a DEFINE_ADJUST function. I have found that the variable n_uds is always zero when I run the NT version, regardless of the number of activated user-defined scalars. On the SGI Unix version of Fluent 5.5, however, n_uds takes the right value. I use the standard "udf.h" header. I make no declaration of the variable n_uds in my code.

Ola Nordblom
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