coupled solver for heat exchanger

chinna · May 17, 2013, 16:01

hai, thanks for ur time...

im simulating heat exchanger. can i use coupled solver?
as from user guide, it says; can use large time step size... well im wondering what is the range of time step size can be used..

can i use up to 5 to 10 sec as time step size or more..??

Jim87 · July 28, 2013, 17:13

Hi,

There is no general answer for long and short time steps.

If you have an heat exchanging process and you want to know what's happening in the first 1 mm ouf your solid fan, radiator or.... you may need very short time step sizes.

If you are only interested in your stationary final value then a transient case isn't needed (if the model fits).

It is a compromise on calculation time, exactness and your personal requirements.

In simple cases you can run a simulation at two time step sizes and compare the results...

May 17, 2013, 16:01	coupled solver for heat exchanger	#1
chinna Member Lagunesvary Join Date: Apr 2013 Location: Malaysia Posts: 40 Rep Power: 13	hai, thanks for ur time... im simulating heat exchanger. can i use coupled solver? as from user guide, it says; can use large time step size... well im wondering what is the range of time step size can be used..can i use up to 5 to 10 sec as time step size or more..??

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July 28, 2013, 17:13		#2
Jim87 Member Stephan Langenberg Join Date: Sep 2011 Location: Germany Posts: 73 Rep Power: 15	Hi, There is no general answer for long and short time steps. If you have an heat exchanging process and you want to know what's happening in the first 1 mm ouf your solid fan, radiator or.... you may need very short time step sizes. If you are only interested in your stationary final value then a transient case isn't needed (if the model fits). It is a compromise on calculation time, exactness and your personal requirements. In simple cases you can run a simulation at two time step sizes and compare the results...