# UDF for mass flow profile

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 May 17, 2012, 07:27 UDF for mass flow profile #1 Senior Member   Join Date: Mar 2009 Location: Indiana, US Posts: 185 Rep Power: 8 Hi, I am new at writing UDF's and need help with a UDF for a mass flow profile on an outlet plane. The mass flow varies along the x-direction across the plane by the following formula tsat-((0.75*(tout-tin)*y^2)+(1.75*(tout-tin)*y)+tin) The UDF i have written is as follows #include "udf.h" 　 DEFINE_PROFILE (mass_profile, t i) { real x[ND_ND]; real y; face_t f; int tsat=35; int tin=32.78; int tout=34.44; begin_f_loop (f,t) { F_CENTROID (x,f,t); y = x[2]; F_PROFILE = tsat-((0.75*(tout-tin)*y^2)+(1.75*(tout-tin)*y)+tin); } end_f_loop (f,t) } Keep getting "line 1 : parse error" when trying to interpret the UDF into Fluent Any help appreciated Regards Luke Last edited by delaneyluke; May 18, 2012 at 00:23.

May 23, 2012, 21:55
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 Originally Posted by delaneyluke Hi, 　 DEFINE_PROFILE (mass_profile, t i) { real x[ND_ND]; real y; face_t f; int tsat=35; int tin=32.78; int tout=34.44; begin_f_loop (f,t) { F_CENTROID (x,f,t); y = x[2]; F_PROFILE = tsat-((0.75*(tout-tin)*y^2)+(1.75*(tout-tin)*y)+tin); } end_f_loop (f,t) } Keep getting "line 1 : parse error" when trying to interpret the UDF into Fluent Any help appreciated Regards Luke
Line 1 should be like that
DEFINE_PROFILE (mass_profile, t ,i)
there miss "," in this macro

 May 23, 2012, 22:45 #3 Member   Krishna Join Date: Oct 2009 Posts: 34 Rep Power: 7 #include "udf.h" 　 DEFINE_PROFILE (mass_profile, t i) { real x[ND_ND]; real y; face_t f; /* define temp as float/ real int tsat=35; int tin=32.78; int tout=34.44; begin_f_loop (f,t) { F_CENTROID (x,f,t); /* y=x[1]; to get the y cood y = x[2]; /* F_PROFILE(f, t, i) F_PROFILE = tsat-((0.75*(tout-tin)*y^2)+(1.75*(tout-tin)*y)+tin); } end_f_loop (f,t) } Keep getting "line 1 : parse error" when trying to interpret the UDF into Fluent Any help appreciated Regards Luke

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