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Old   April 7, 2003, 11:18
Default Variable velcity at inlet
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I met a problem in calculating the airflow pass the building. The inlet velocity varies with the height from the groud. It is not a constant. How can I cope with this problem?

Thanks John
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Old   April 7, 2003, 11:34
Default Re: Variable velcity at inlet
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Hi! You can find a good example with explanations in Fluent UDF domentation. You should write UDF which looks something like this (with other velocity function):

include "udf.h"

DEFINE_PROFILE(inlet_x_velocity, thread, position) { real x[ND_ND]; /* this will hold the position vector */ real y; face_t f;

begin_f_loop(f, thread)



y = x[1];

F_PROFILE(f, thread, position) = 20. - y*y/(.0745*.0745)*20.;

} end_f_loop(f, thread) }

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