UDF for velocity inlet

Zhaohui Lu · January 30, 2011, 23:36

Hi all,

Is there anybody know if UDF could define the velocity boundary which is related to time and space at the same time?

Thanks!

Joey

General_Gee · February 1, 2011, 05:45

Heya,

Check here for a UDF velocity profile that varies with space

http://www.cfd-online.com/Forums/flu...d-turbine.html

you can access the current time using

real current_time;
current_time=RP_Get_Real("flow-time");

you can then add this into the equation for F_PROFILE

eg

F_PROFILE(f, thread, position) = 1.73-((15-y)*(15-y)*1.73/(30*30))+current_time;

Good luck

Zhaohui Lu · February 3, 2011, 01:43

Quote:

Originally Posted by General_Gee

Heya,

Check here for a UDF velocity profile that varies with space

http://www.cfd-online.com/Forums/flu...d-turbine.html

you can access the current time using

real current_time;
current_time=RP_Get_Real("flow-time");

you can then add this into the equation for F_PROFILE

eg

F_PROFILE(f, thread, position) = 1.73-((15-y)*(15-y)*1.73/(30*30))+current_time;

Good luck

Thanks man. let me try it again!

January 30, 2011, 23:36	UDF for velocity inlet	#1
Zhaohui Lu New Member ZHAOHUI Join Date: Jan 2011 Location: QLD Posts: 9 Rep Power: 15	Hi all, Is there anybody know if UDF could define the velocity boundary which is related to time and space at the same time? Thanks! Joey

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
UDF for inlet mass flow rate	rahulsuresh89	Fluent UDF and Scheme Programming	1	October 16, 2010 17:06
Fluent UDF load and apply inlet velocity b.c.	Knut Lehmann	Main CFD Forum	2	June 29, 2007 04:53
UDF 3D inlet b.c. problem	Andrew	FLUENT	4	May 25, 2004 04:24
find the best inlet with udf	Tuckbros	FLUENT	0	May 20, 2004 12:56
Fluent6.0 UDF inlet velocity BC	David	FLUENT	5	September 7, 2002 02:07

February 1, 2011, 05:45		#2
General_Gee New Member Brian Join Date: Aug 2010 Location: Southampton Posts: 12 Rep Power: 15	Heya, Check here for a UDF velocity profile that varies with space http://www.cfd-online.com/Forums/flu...d-turbine.html you can access the current time using real current_time; current_time=RP_Get_Real("flow-time"); you can then add this into the equation for F_PROFILE eg F_PROFILE(f, thread, position) = 1.73-((15-y)(15-y)1.73/(30*30))+current_time; Good luck