# How to define a parabolic velocity inlet of particles with UDF

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 February 21, 2010, 12:10 How to define a parabolic velocity inlet of particles with UDF #1 New Member   zumaqiong Join Date: Jan 2010 Posts: 11 Rep Power: 7 Hi, World! I am doing a similation of blood flow with particles. the velocity of particles at inlet is a parabolic one -261.3*(0.0001-x*x)*exp(-0.5*pow(15.15*t-3.46-15.15*n,2)); x is the position of particles injection, t is the flow time. n=(int)t/T. T is the period. so this is a parabolic time dependent velocity of particles. i dont know how to define it in UDF because in the Injection Panel, u can only enter a constant of velocity magnitude without UDF. I need your help! Thanks!

 February 22, 2010, 10:12 #2 New Member   USMAN Join Date: Nov 2009 Posts: 28 Rep Power: 8 I think "custom field functions" in Fluent can help you in this regard. No need to write a udf Regards

February 22, 2010, 10:46
Hi
#3
New Member

zumaqiong
Join Date: Jan 2010
Posts: 11
Rep Power: 7
Quote:
 Originally Posted by usman naseer I think "custom field functions" in Fluent can help you in this regard. No need to write a udf Regards
but it is time dependent parabolic velocity, how to use custom field functions to solve it. can u explain it with more details?
Thank u!

 Tags parabolic velocity, particles, time dependent, udf

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