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Heat flux on interior wall between solids

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Old   October 24, 2019, 01:09
Default Heat flux on interior wall between solids
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Hi there!

I'm just wondering if anyone knows if this is possible in Fluent:

I want to apply a heat flux BC on a face between two solid zones. Take these blocks for example (see attached).

Fluent creates a shadow pair for the interior shared face. As far as I'm aware these need to be coupled to ensure heat transfer between the two solids. Unfortunately this means you cannot apply a heat flux to this face (at least in the conventional way).

The second picture is how the temperature profile should look (bottom face BC T=0C), and the third is how it looks in Fluent (no conduction between solids).

Does anyone know a solution?

Cheers!
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File Type: jpg blocks.jpg (83.3 KB, 16 views)
File Type: jpg blocks correct.jpg (164.4 KB, 18 views)
File Type: jpg blocks fluent.jpg (67.5 KB, 18 views)
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Old   October 24, 2019, 05:07
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Moritz Kuhn
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The shadow pair means that your solid a connected correctly. If you choose under Thermal Conditions coupled than a heat conduction from solid 1 to solid 2 is possible, which seems not the case regarding your third picture. With this option it makes in general no sense to determine a certain heat flux, because the heat flux between your solids is caluclated by fluent using the thermal properties of your solids. You can apply an additional heat flux between your solids, if you define a Wall Thickness > 0 and a Heat Generation Rate (w/m). Like a thin heater between your solids.
If you choose Heatflux or Temperature, your solids will not interact with each other, there will be no heat flux from one solid to the other, its like two external walls.
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Old   October 24, 2019, 19:02
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Ah so simple!

Thank you!
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