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Calculate the effective thermal conductivity

Posted Jun 16, 2014, 6:05 a.m. EDT Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.3b 3 Replies

Kevin Ludwig
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Hi,
im very new in Comsol and its my first post here, so if you need more information for saving my problem just let me know.

I want to calculate the effective thermal conductivity of a tank containing insulation materials. The tank should be heated below and I want to determine the temperature at the top and bottom. With this information, I could then calculate the effective thermal conductivity of the complete tanks.

Now i created my geometry and filled the tank first with air.
But my simulation does not work. I think its due to the physics settings. Because im not sure if i did it right. In the most posts here there is written something about the heat flux. But if i dont know how to set it up.

I've attached my Comsol-file

I hope you can help me.

Greetings
Kevin
3 Replies Last Post Jun 18, 2014, 3:09 a.m. EDT
Pieter Westerik
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Posted: 1 decade ago Jun 17, 2014, 9:27 a.m. EDT
Hi Kevin,

You have not attached your file.

What do you mean by 'the simulation does not work'? Do you get some error message? Don't you get the expected results?
Hi Kevin, You have not attached your file. What do you mean by 'the simulation does not work'? Do you get some error message? Don't you get the expected results?
Kevin Ludwig
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Posted: 1 decade ago Jun 17, 2014, 10:11 a.m. EDT
Oh i'm sorry, I was sure i attached it, but know you will get it :)
I hope its ok that it is on German.

The problem is that the simulation is not converged.
Oh i'm sorry, I was sure i attached it, but know you will get it :) I hope its ok that it is on German. The problem is that the simulation is not converged.
Pieter Westerik
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Posted: 1 decade ago Jun 18, 2014, 3:09 a.m. EDT
Instead of 'offener rand' I would use a fixed 'temperature' node (probably 'Temperatur' in German?), and instead of 'Einströmender Wärmefluss' I would use a normal 'Heat Flux' node (probably just 'Wärmefluss' in German?), I believe 'Einströmender Wärmefluss' is for the case that the heat is flowing in by means of convection.
Instead of 'offener rand' I would use a fixed 'temperature' node (probably 'Temperatur' in German?), and instead of 'Einströmender Wärmefluss' I would use a normal 'Heat Flux' node (probably just 'Wärmefluss' in German?), I believe 'Einströmender Wärmefluss' is for the case that the heat is flowing in by means of convection.

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