Discussion Forum

Hi Sara,

if I understand well you are using 2 different physics.
If you want to combine the heat transfer in both of them first of all you need to use the same variable T.
By default COMSOL usually set T as the temperature variable for the first physic and T2 for the second.

Let me know if it works.

Hi Marino,
I set T as dependent variable for both physics.
Please find attached my model.
The domain 3 is water, it's characterized by laminar flow and heat transfer, the domains 2 and 4 are the pipe (solid-steel) and now the domains 1 and 5 are a rock (solid granite). I would like to turn them (domains 1-5) in a porous media (soil).
I added the new physics: heat transfer in porous media, I set T as dependent variable. Now I think that my main problem is that I need to remove the boundary condition "thermal insulation" in the boundary 2 and 12 to be able to link the two physics. Do you know how I can do?
My model is very similar to a geothermal system. Do you know any tutorial or any exercise where I can better understand?

Please send me the file saved for previous version (4.3) otherwise I can not open it.
Thank you.
--
Marino Miccio
Chemical Engineer
---
Visit the channel www.youtube.com/ScuolaTech

Please find attached:
Thanks

I'm sorry but Comsol says that the model was created with a later version.
I can't still open it.

--
Marino Miccio
Chemical Engineer
---
Visit the channel www.youtube.com/ScuolaTech

Don't worry, I can save only in 4.3b and in 4.4.

Hi Guys,

So did anyone manage to solve this problem? If you have, it will be of great help to describe how you solved it.

The Comsol support was very helpful, they told me I could obtain the same results of the conjugate heat transfer with the manually coupling of a laminar flow/turbulent flow interface with a heat transfer interface, in my case heat transfer interface in porous media.
My error was that i wasn't able to couple the two physics. I solved this problem putting T (dependent variable) as input value for the heat transfer in fluid node, for the solid node and for the laminar flow node. The material properties will vary from point to point depending on the value of the temperature. This is how you can transfer information from the Heat Transfer in Porous media interface to the other physics.

Hi Sara,

I don't understand what did you do for fixing the problem. If you still have the file it would be very useful! How does the T vary in your model?

hi, can you share your correct modle for us ? thanks!