# Velocity(inlet Boundary)

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 July 18, 2012, 05:26 Velocity(inlet Boundary) #1 New Member   Amir sadeghi pour marvi Join Date: Dec 2011 Posts: 25 Rep Power: 5 Hi everyone; I simulated 3D water tank. Changes in the Y direction is not important. when i add the Velocity.c to fluent this error appear: line 20: i: undeclared variable #include "udf.h" #define ZMIN 0.0 #define ZMAX 0.8 #define UH 0.063 #define UMEAN 0.15625 #define P 0.21 DEFINE_PROFILE(x_velocity,t,i) { real z, x[ND_ND], h; face_t f; h=ZMAX-ZMIN; begin_f_loop(f,t) { F_CENTROID(x,f,t); z=x[1]; if (z<=0.4) F_PROFILE(f,t,i)=UH*pow(z/0.1,P); else F_PROFILE(f,t,i)=UMEAN; } end_f_loop(f,t) } what is problem? Last edited by Prince of Persia; July 18, 2012 at 06:47.

 July 18, 2012, 07:58 #2 Senior Member     Alex Join Date: Jun 2012 Location: Germany Posts: 1,098 Rep Power: 19 I am pretty sure that the pow(x,y) function is a part of the math library. Try adding #include "math.h" to the header.

 July 18, 2012, 13:19 #3 New Member   Join Date: Jan 2010 Location: United Kingdom Posts: 27 Rep Power: 7 udf.h takes care of including other file header files for math functions. try defining the profile by: Code: ```begin_c_loop(c,t) { C_CENTROID(x,c,t); .. .. F_PROFILE(c,t,i) = } end_c_loop(c,t)```

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