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Which Algorithm???

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Old   August 6, 2003, 10:01
Default Which Algorithm???
Ted Crilly
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Hello there

I hope you are well!

I have a question for you - maybe you can help me.

I have thought about a problem i would like to model using CFD.

I have a big open space that has a large glass facade, the facade gets very hot in summer, to cool the space it is suggested to use a forced convection system to blow cool air at the facade surface and thus reduce the radiant effects of heat exchange.

If my surface boundary is set to 50degC and i direct a large stream of cold air at say 14degC, this surface boundary will reduce in temperature by some amount,

i.e. the large thermal buoyancy effect from the hot surface will reduce in time over a short period

Does my Steady State simulation using the simple algorithm take this into account or not? should it be a transient run with PISO algorithm? when using Star

If not how would I set up such a problem? - does it need to be a transient run? will i need to change the boundary temperatures at increment

Thanks for any help offered


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Old   August 6, 2003, 11:36
Default Re: Which Algorithm???
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If you don't care how long it takes to cool anything off than run it steady-state. With steady-state you will get the final equilibrium answer but not the path to get there. If you want to know what the temperature is at 1 second or 2 seconds or 10 seconds after you turn on the cold air, then you have to run transient.
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Old   August 6, 2003, 12:01
Default Re: Which Algorithm???
Ted Crilly
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thanks for this advice steve
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