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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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Boiling of water in 4.0-4.1

Posted Jan 27, 2011, 8:42 a.m. EST Chemical Reaction Engineering, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 4.0a, Version 4.1 2 Replies

Kalle Lofgren
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Hi!
I am trying to follow the pdf-tutorial on how to make comsol boil water (www.comsol.com/showroom/documentation/model/3972/).
My problem is that the tutorial is written for comsol 3.5, and as you know pretty much nothing is the same in the newer versions!
I think i have understood everything in the tutorial exept the chapter "Physics settings" (s 17-18) where you are suppose to modify the continuity and phase field equations to allow for phase change.

I am successful in solving the Transient Initialization step, but I cant get the Time dep. study to work.
I would be very glad if someone could help me find out how i am supposed to type in those settings!

I have tried to add a Volume Force to my lan 2-face flow and typed in: "usource-chns.divU" for x, and "-u*phix-v*phiy+source.phi" for y, but then when i run the Time dep. study it fails to evaluate variable jacobian...
If i skip the volume force it fails to find consistant initial values...

You can download the 3.5 version mph-file at the link i posted earlier.

Thanks
/Kalle

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2 Replies Last Post Apr 27, 2011, 10:33 a.m. EDT
Lechoslaw Krolikowski
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Posted: 1 decade ago Feb 10, 2011, 10:55 a.m. EST
My proposal is as follows. Run COMSOL 4.1 (You need COMSOL Multiphysics 4.1 + CFD Module + Heat Transfer Module). Open the file boiling_water.mph from www.comsol.com/showroom/documentation/model/3972/. When opening this file will be processed in accordance with the requirements of the Comsol 4.1 program. On the Model Builder window expand model tree. By left-clicking on the nodes you see all of the settings.
Regards
Andrzej Kolek
My proposal is as follows. Run COMSOL 4.1 (You need COMSOL Multiphysics 4.1 + CFD Module + Heat Transfer Module). Open the file boiling_water.mph from http://www.comsol.com/showroom/documentation/model/3972/. When opening this file will be processed in accordance with the requirements of the Comsol 4.1 program. On the Model Builder window expand model tree. By left-clicking on the nodes you see all of the settings. Regards Andrzej Kolek
Søren Erbs
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Posted: 1 decade ago Apr 27, 2011, 10:33 a.m. EDT
Hi... I'm also trying to model boiling water in comsol 4.1 with great difficulty. If you manage to pull it off I would very much appreciate any assistance!

Kind Regards

Søren
Hi... I'm also trying to model boiling water in comsol 4.1 with great difficulty. If you manage to pull it off I would very much appreciate any assistance! Kind Regards Søren

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