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Free Convection with Open Boundary?

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Old   May 29, 2017, 07:56
Talking Free Convection with Open Boundary?
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Tina Maake
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I am modelling a geothermal pipe. For computational reasons I can not Modell the whole 4000 m borehole.
So I restricted the are for 400 m. I want to take a closer look at the free convection, but I am confused what BC for the upper und the downer part may be the correct one.

Open Boundary?
Or Close the pipe?

At former modelling approaches the convection cells exceeded 400m.
(This is for my master Thesis and I am using comsol multiphysics)

Best regards,

Tina Maake
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Old   May 29, 2017, 22:41
Default open's stress free
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Svetlana Tkachenko
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Hello, I am not familiar with COMSOL, but my novice view is as follows.

- Do not close the pipe, it is like putting a wall.
- Do not use outlet, it requires pressure or velocity (unless zero average static pressure suits you well).
- I would suggest open boundary, it is a stress free boundary condition.
- It is discussed here and there for example.
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boundary condition, comsol, free convection, geothermal, heat transfer

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