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coupled solver for heat exchanger

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Old   May 17, 2013, 15:01
Question coupled solver for heat exchanger
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Lagunesvary
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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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Old   July 28, 2013, 16:13
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Stephan Langenberg
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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...
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