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Loop of a inlet mass flow rate

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Old   August 22, 2014, 05:11
Default Loop of a inlet mass flow rate
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Thomas Green
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Hi all,
I have a problem with my UDF. I am trying to create a cycle of a well defined mass flow rate in the inlet of a square channel. I need to create a loop for a inlet mass flow rate of 1.5 if the time is under 10 seconds and when it is over 10 seconds it should be 8.33 until it arrives to 20 seconds. These two steps (high & low mass flow rate) then should be cycled 200 times.
Below I attach the code I wrote to clarify the problem.

#include "udf.h"
int j=0;
int k=10;
int n;
int o;
int m;
int v=10;
DEFINE_PROFILE(flow_profile,t,i){
face_t f;
real ti=CURRENT_TIME;
begin_f_loop(f,t){
for ( n=0; n<=200; n++ ){
if(ti>=j && ti<=v){
F_PROFILE(f,t,i)=1.5;
}else{
o=j+10;
v=k+10;
if( ti>o && ti<=v ){
F_PROFILE(f,t,i)=8.33;
}else{
j=j+10;
v=v+10;
}
}
m=n;}
}
end_f_loop(f,t)
}
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Old   August 22, 2014, 06:24
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Marcin
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You can use for this FSI one way method
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Old   August 22, 2014, 08:44
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Thomas Green
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Ok thank you for your fast answer, finally I found the solution only changing some variables.
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