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Unable to obtain the actual velocity profile of a sinusoidal udf

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Old   March 4, 2017, 05:49
Default Unable to obtain the actual velocity profile of a sinusoidal udf
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Gary
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Hi,
I am working on a project on analyzing haemodynamic properties in bifurcating aneurysmic aortas and have prepared an udf for the inlet velocity:

#include "udf.h"//file that contains definitions for define functions and fluent operations
#define PI 3.141592654

DEFINE_PROFILE(inlet_velocity,th,i)
{
face_t f;
real t = CURRENT_TIME;
begin_f_loop(f,th)

{
F_PROFILE(f,th,i) = ((-0.086)*(sin(((2*PI/3)*t) + 0.609))) + 0.0075;

}
end_f_loop(f,th);
}
I had interpreted and activated the function in the function fluent setup. The solution ran pretty well converging at each time step, but when I plotted the inlet velocity in a transient plot in CFD post(in results, not in solution), the part of the sine curve that should be in the negative y- direction was inverted along the positive y direction, i.e the absolute value of the sinusoidal funtion was displayed. Can anyone suggest a way to get the actual profile?
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