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Velocity blood flow - repeating UDF

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Old   January 20, 2017, 06:27
Default Velocity blood flow - repeating UDF
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Robert O'Grady
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I am quite new to fluent ANSYS.
I am running a simulation for transient blood flow in an aorta. A UDF is required at the inlet to describe the velocity profile over time. My UDF code contains various functions right up to about 0.9 seconds however when i monitor the velocity at the inlet, the code never gets past 0.5 seconds and starts to repeat itself. I am just wondering if it is my code (below) or my simulation that the UDF is repeationg like this. Please Help, Thanks.

code:
#include "udf.h"
DEFINE_PROFILE(inlet_velocity,th,i)
{
face_t f;
begin_f_loop(f,th)
double t=(CURRENT_TIME*2-floor(CURRENT_TIME*2))/2;
{
if(t<=0.0586)
{F_PROFILE(f,th,i)=0.0064;}

else if((t>0.0586)&&(t<=0.234))
{F_PROFILE(f,th,i)=(((2239*t*t*t)-(814.3*t*t)+(73.01*t)-1.4099)/100);}

else if((t>0.234)&&(t<=0.3049))
{F_PROFILE(f,th,i)=(((5327.9*t*t)-(2433.3*t)+277.94)/100);}

else if((t>0.3049)&&(t<=0.5202))
{F_PROFILE(f,th,i)=(((-5947.8*t*t*t)+(7368.3*t*t)-(3146.8*t)+474.48)/100);}

else if((t>0.5202)&&(t<=0.6836))
{F_PROFILE(f,th,i)=(((-48372*t*t*t*t)+(120715*t*t*t)-(112868*t*t)+(46881*t)-7301.2)/100);}

else if((t>0.6836)&&(t<=0.8705))
{F_PROFILE(f,th,i)=(((3252.7*t*t*t)-(7381*t*t)+(5543.3*t)-1377.3)/100);}

else if((t>0.8705)&&(t<0.8892))
{F_PROFILE(f,th,i)=(((-368.44*t*t)+(644.33*t)-281.05)/100);}


else if((t>0.8892)&&(t<=1))
{F_PROFILE(f,th,i)=0.005714;}

}
end_f_loop(f,th);
}
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