# Time varying velocity BC

 Register Blogs Members List Search Today's Posts Mark Forums Read

 March 22, 2011, 12:29 Time varying velocity BC #1 New Member   Tejasvi Krishna Join Date: Sep 2010 Location: College station,Tx, USA Posts: 11 Rep Power: 7 Hello, I need a sinusoidal time varying UDF for my problem , I am kind of new to fluent , please direct me , any time varying BC tutorial is helpful but couldnt find any on google Thankyou Tejasvi

 March 22, 2011, 13:27 #2 Senior Member     Amir Join Date: May 2009 Location: Montreal, QC Posts: 739 Blog Entries: 1 Rep Power: 14 Hi, if you are new in UDF, it will be better to use other ways like defining a profile. refer to: in user guide (7.1.9 in FLUENT 6.3.26)

 March 22, 2011, 14:06 #3 New Member   Tejasvi Krishna Join Date: Sep 2010 Location: College station,Tx, USA Posts: 11 Rep Power: 7 thanks for the reply, I will try that out , meanwhile I have written an UDF , does this look reasonable #include "udf.h" DEFINE_PROFILE(transient_velocity, thread, position) { float t, velocity; face_t f; t = RP_Get_Real("flow-time"); velocity = Sin(40*3.14*t); begin_f_loop(f, thread) { F_PROFILE(f, thread, position) = velocity; } end_f_loop(f, thread)

March 22, 2011, 14:41
#4
Senior Member

Amir
Join Date: May 2009
Location: Montreal, QC
Posts: 739
Blog Entries: 1
Rep Power: 14
it needs some changes:
Quote:
 #include "udf.h" #include "math.h" DEFINE_PROFILE(transient_velocity,thread,position) { face_t f; float t, velocity; t = CURRENT_TIME; velocity = sin(40*3.14*t);//argument should be in radian begin_f_loop(f, thread) { F_PROFILE(f, thread, position) = velocity; } end_f_loop(f, thread) }

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post xiuying OpenFOAM Running, Solving & CFD 8 August 27, 2013 15:33 Andy Chen FLUENT 2 June 30, 2009 12:48 saurabh Phoenics 1 June 9, 2009 06:17 dm2747 FLUENT 0 April 17, 2009 01:29 skabilan OpenFOAM Running, Solving & CFD 12 September 17, 2007 17:48

All times are GMT -4. The time now is 12:41.