transient time

mina.p · April 25, 2014, 14:52

Hi
I simulate the heat transfer in a channel with steady state setting & 1000 iteration
after that i do the same simulation in transient mode with total time:400 & timestep:0.01
but i still didn't reach the steady state data
can any body help me in time setting for transient??

ghorrocks · April 26, 2014, 07:27

This FAQ discusses these sort of issues a little bit: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Are you sure your simulation is steady state anyway? It will never converge with a steady model if the flow is actually transient.

mina.p · April 26, 2014, 08:20

I simulate a channel with a blade in it.at first the blade is steady afTer that i do the simulation for rotating blade
So i do the first part with steady state setting and it converges.
But i do it again with transient to know the approximate total time for the case of moving blade.
But it take long time and still didn't converge.

ghorrocks · April 26, 2014, 08:24

Can you post an image of what you are modelling?

mina.p · April 26, 2014, 08:36

http://www.imageupload.co.uk/gAZ
http://www.imageupload.co.uk/gA5
total temperature of steady state and transient with total time=500 & time step=.01

ghorrocks · April 26, 2014, 08:47

Have you read the FAQ I linked to in the first post? All the issues you should be looking at are described there.

April 25, 2014, 14:52	transient time	#1
mina.p New Member mina Join Date: Nov 2013 Posts: 20 Rep Power: 13	Hi I simulate the heat transfer in a channel with steady state setting & 1000 iteration after that i do the same simulation in transient mode with total time:400 & timestep:0.01 but i still didn't reach the steady state data can any body help me in time setting for transient??

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April 26, 2014, 07:27		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	This FAQ discusses these sort of issues a little bit: http://www.cfd-online.com/Wiki/Ansys...gence_criteria Are you sure your simulation is steady state anyway? It will never converge with a steady model if the flow is actually transient.

April 26, 2014, 08:20		#3
mina.p New Member mina Join Date: Nov 2013 Posts: 20 Rep Power: 13	I simulate a channel with a blade in it.at first the blade is steady afTer that i do the simulation for rotating blade So i do the first part with steady state setting and it converges. But i do it again with transient to know the approximate total time for the case of moving blade. But it take long time and still didn't converge.

April 26, 2014, 08:24		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	Can you post an image of what you are modelling?

April 26, 2014, 08:36		#5
mina.p New Member mina Join Date: Nov 2013 Posts: 20 Rep Power: 13	http://www.imageupload.co.uk/gAZ http://www.imageupload.co.uk/gA5 total temperature of steady state and transient with total time=500 & time step=.01

April 26, 2014, 08:47		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,852 Rep Power: 144	Have you read the FAQ I linked to in the first post? All the issues you should be looking at are described there.