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Old   April 25, 2014, 13:52
Default transient time
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mina
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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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Old   April 26, 2014, 06:27
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Glenn Horrocks
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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.
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Old   April 26, 2014, 07:20
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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.
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Old   April 26, 2014, 07:24
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Can you post an image of what you are modelling?
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Old   April 26, 2014, 07:36
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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
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Old   April 26, 2014, 07:47
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Glenn Horrocks
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Have you read the FAQ I linked to in the first post? All the issues you should be looking at are described there.
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