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Need help with conjugate heat transfer

Posted Nov 12, 2017, 9:52 a.m. EST Fluid & Heat Version 5.3 3 Replies

Alessandro Hülser
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Hello,

I want to add a flow to my heat transfer model. So I made a very simple model just for learning how to use the conjugate heat transfer module. Until now my model is not working - I get an error message. I don´t know what is wrong - maybe COMSOL doesn´t understand the shape of my inlet and outlet? Could anybody help me to find out what´s wrong with this model?

Thanks!

Alessandro

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3 Replies Last Post Nov 13, 2017, 12:57 p.m. EST
Lasse Murtomäki
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Posted: 7 years ago Nov 13, 2017, 9:43 a.m. EST

Hi

Your problem is rather demanding. I downloaded your model and realized that your mesh was very sparse for fluid mechanics. I changed the mesh density to "Normal" and ran a steady-state study. It took 1 h and 21 mins to solve. I suppose that a time-dependent study would take weeks, if it converged.

BR Lasse

Hi Your problem is rather demanding. I downloaded your model and realized that your mesh was very sparse for fluid mechanics. I changed the mesh density to "Normal" and ran a steady-state study. It took 1 h and 21 mins to solve. I suppose that a time-dependent study would take weeks, if it converged. BR Lasse
Sohan Birla
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Posted: 7 years ago Nov 13, 2017, 10:37 a.m. EST

Your boudaries for heat at outlet boudary is incosistent. In heat transfer node provide outlfow boudary for outlet.

Your boudaries for heat at outlet boudary is incosistent. In heat transfer node provide outlfow boudary for outlet.
Alessandro Hülser
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Posted: 7 years ago Nov 13, 2017, 12:57 p.m. EST

Your boudaries for heat at outlet boudary is incosistent. In heat transfer node provide outlfow boudary for outlet.

I defined my outlet a outflow boundary and made my model again much easier - It´s just that I want to learn what things I have to look at modelling with COMSOL.

So this is the next model - still not working...any ideas?

Thanks for your help!

>Your boudaries for heat at outlet boudary is incosistent. In heat transfer node provide outlfow boudary for outlet. I defined my outlet a outflow boundary and made my model again much easier - It´s just that I want to learn what things I have to look at modelling with COMSOL. So this is the next model - still not working...any ideas? Thanks for your help!

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