# User defined functions

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 March 3, 2013, 06:36 User defined functions #1 New Member   Sudarshan D Pangavhane Join Date: Mar 2013 Posts: 2 Rep Power: 0 Kindly help me building a user defined function for following inlet velocity conditions.... "The velocity inlet has a time varying velocity imposed at the start of the solution in the form of a full period sinusoid with an amplitude of 0.05m/s and frequency of 3200Hz. After the sinusoid is complete the velocity remains zero at the inlet for remainder of solution."

 March 7, 2013, 09:35 #2 Senior Member   Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 486 Rep Power: 9 Depends on what software and language you have to use are using: CFX CEL: 0[m/s] + step((1/3200)-t/1[s])*0.05[m/s]*sin(2*3.14159265*3200*t) C++: IF t <= (1/3200)s Velocity:=0.05*sin(2*3.14159265*3200*t); ELSE Velocity:=0;

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