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Interface Model:None or zero thermal conductance? |
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October 10, 2010, 10:16 |
Interface Model:None or zero thermal conductance?
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#1 |
New Member
Join Date: Jul 2010
Posts: 23
Rep Power: 15 |
Dear all,
In defining domain interfaces in CFX there are 3 options for interface model: None,Thermal conductance and Thin Material. what is the difference between choosing none or a zero thermal conductance? I have solved the same problem with these two options and I got different results. Thanks |
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October 11, 2010, 04:04 |
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#2 |
New Member
anton.gardi
Join Date: Aug 2010
Posts: 21
Rep Power: 15 |
I think you should have a look in the help . the physics is different in every case. in case you have a solid immersed in a fluid you should check also what the conjugate heat transfer is ..
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October 11, 2010, 14:41 |
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#3 |
New Member
Join Date: Jul 2010
Posts: 23
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I read the documentation but there is no description for the none option.
The two others do the same job in different ways. "Heat Transfer Determines whether or not heat transfer models are applied between the sides of the interface. The options are:
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October 11, 2010, 18:09 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
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None means no interface material, and heat is transferred across the interface with no loss or resistance. The other options add thermal resistance, they just calculate the thermal resistance different ways.
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October 12, 2010, 01:43 |
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#5 |
New Member
Join Date: Jul 2010
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Dear ghorroks,
If so None and a zero thermal resistance must give the same result, I have tried this and the results were different! |
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October 12, 2010, 18:18 |
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#6 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,703
Rep Power: 143 |
I have not used these options so do not know in detail. But I would have assumed zero thermal resistance then should be the same as the none option. If you have a case which shows it is not the same then talk to CFX Support as you may have found a bug.
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October 12, 2010, 22:15 |
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#7 |
Senior Member
Michael P. Owen
Join Date: Mar 2009
Posts: 196
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