how to apply UDF only for one part of the Domain?

NAD · December 9, 2013, 03:38

Hi,
In a mixture, axisymetric, transient simulation which is performed on Domain composed of two regions(region I,II ) , I want to use UDF(DEFINE_INIT) to initialize some parameters of the fluid in one region(similar to patch).

the probelm is that i don't know how to applied the udf just to one region of the domain? how to get only the cell threads of region I?

any one could help me on this?

thanks in advance

best regards,
NAD

pakk · December 9, 2013, 05:00

Find out what the zone number is of the zone that you want (in Fluent, I think it is at the 'boundary conditions' tab, see which number is shown for the relevant 'interior'). Suppose that number is 8, then change your udf into

Code:

if (THREAD_ID==8) {
 \\here you put the code you had before
 }

NAD · December 9, 2013, 21:25

Hi pakk,

thanks so much for your quick reply and your help.

regards,
NAD

December 9, 2013, 05:00		#2
pakk Senior Member Join Date: Nov 2013 Posts: 1,965 Rep Power: 26	Find out what the zone number is of the zone that you want (in Fluent, I think it is at the 'boundary conditions' tab, see which number is shown for the relevant 'interior'). Suppose that number is 8, then change your udf into Code: if (THREAD_ID==8) { \\here you put the code you had before } raj kumar saini likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
udf for multi domain problems	hzsme	Fluent UDF and Scheme Programming	3	June 11, 2019 06:18
phase fraction part of domain	RBJ	OpenFOAM Post-Processing	0	July 6, 2010 09:33
UDF: how to know domain number in the model?	mssound	FLUENT	0	May 17, 2010 15:00
Fluent UDF load and apply inlet velocity b.c.	Knut Lehmann	Main CFD Forum	2	June 29, 2007 04:53
UDF to apply source to a group of cells	Hiranya Nath	FLUENT	4	March 15, 2002 05:01

December 9, 2013, 21:25		#3
NAD Member Join Date: Oct 2011 Posts: 37 Rep Power: 14	Hi pakk, thanks so much for your quick reply and your help. regards, NAD