how to define two inlet boundary condition at the different time

nuengao · December 13, 2010, 03:43

Dear all

pleas give me your suggestion about defining the two boundary condition at the different time for simulation heat transfer:
first time= 0-15s use temperature = 150C, and then time= 15-30s use 91C .

the output that I want to look are the outlet temperature of each inlet boundary condition.

Bernhard · December 13, 2010, 05:44

You can easily to this by means of a UDF. You can take a look in the UDF Manual, and use the DEFINE_PROFILE subroutine, in which you can base the value on the time. Good luck!

ComputerGuy · December 13, 2010, 19:40

See a very recent post for examples on how to do (simple) time-varying inlets:

http://www.cfd-online.com/Forums/flu...tml#post287097

Many basic problems like this can be solved by performing a quick search of the forum first.

ComputerGuy

December 13, 2010, 03:43	how to define two inlet boundary condition at the different time	#1
nuengao New Member ekkapong Join Date: Oct 2010 Posts: 18 Rep Power: 16	Dear all pleas give me your suggestion about defining the two boundary condition at the different time for simulation heat transfer: first time= 0-15s use temperature = 150C, and then time= 15-30s use 91C . the output that I want to look are the outlet temperature of each inlet boundary condition.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Pressure Inlet Boundary Condition	Prasad	FLUENT	6	April 9, 2013 22:32
inlet velocity boundary condition	murali	CFX	5	August 3, 2012 09:56
How to use a solution as an inlet boundary condition in another problem in fluent	geryes	FLUENT	0	February 25, 2010 17:32
Doubt in Inlet Pressure Boundary Condition	Sumitha	FLUENT	3	October 20, 2008 04:19
How to define the boundary condition	Merkle	FLUENT	0	December 1, 2000 05:01

December 13, 2010, 05:44		#2
Bernhard Senior Member Bernhard Join Date: Sep 2009 Location: Delft Posts: 790 Rep Power: 22	You can easily to this by means of a UDF. You can take a look in the UDF Manual, and use the DEFINE_PROFILE subroutine, in which you can base the value on the time. Good luck!

December 13, 2010, 19:40		#3
ComputerGuy Senior Member Real Name :) Join Date: Jan 2010 Location: United States Posts: 192 Rep Power: 16	See a very recent post for examples on how to do (simple) time-varying inlets: http://www.cfd-online.com/Forums/flu...tml#post287097 Many basic problems like this can be solved by performing a quick search of the forum first. ComputerGuy