How to give varying inlet mass flow with respect to time

vallarasu · April 29, 2014, 10:55

Hi guys I'm simulating exhaust manifold.. My interest is to find temperature on the manifold surface.. I have inlet mass flow from the engine with respect to time.. How can I give varrying mass flow with respect to time in Cfx Pre? Thanks in advance

evcelica · May 2, 2014, 19:43

There are many ways to do this. "User function" is one (you can import a .txt file of two columns.

vallarasu · May 3, 2014, 12:17

Actually right now im use that. txt method only.. I want to make that periodic.. How can I do that

ghorrocks · May 4, 2014, 08:32

Use the CEL function "mod" to find where you are in the current cycle. Then use that variable as a look-up function. This will make the function periodic in time.

vallarasu · May 6, 2014, 00:13

Thanks it works

April 29, 2014, 10:55	How to give varying inlet mass flow with respect to time	#1
vallarasu New Member ok Join Date: Dec 2013 Posts: 9 Rep Power: 12	Hi guys I'm simulating exhaust manifold.. My interest is to find temperature on the manifold surface.. I have inlet mass flow from the engine with respect to time.. How can I give varrying mass flow with respect to time in Cfx Pre? Thanks in advance

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May 2, 2014, 19:43		#2
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	There are many ways to do this. "User function" is one (you can import a .txt file of two columns.

May 3, 2014, 12:17		#3
vallarasu New Member ok Join Date: Dec 2013 Posts: 9 Rep Power: 12	Actually right now im use that. txt method only.. I want to make that periodic.. How can I do that

May 4, 2014, 08:32		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Use the CEL function "mod" to find where you are in the current cycle. Then use that variable as a look-up function. This will make the function periodic in time.

May 6, 2014, 00:13		#5
vallarasu New Member ok Join Date: Dec 2013 Posts: 9 Rep Power: 12	Thanks it works