Hello,
I am trying to simulate natural convection in a cylinder with Code-Saturne 2.1.7:
bottom is 30 deg. C
sides and top is 20 deg. C
But I can't see any convection.
I attached case xml file, maybe you can see what is wrong?
Thank you,
Kestutis
Natural convection(buoyancy)
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kestutis
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Yvan Fournier
- Posts: 4081
- Joined: Mon Feb 20, 2012 3:25 pm
Re: Natural convection(buoyancy)
Hello,
You seem to have run only 10 iterations. Natural convection is usually quite slow to set in, so you probably need to run a much longer simulation (go by stages).
Especially, when the fluid is initially "at rest", there is no turbulent diffusion, but only molecular diffusion at start, so heat is transferred very slowly if you use a Dirichlet condition.
Regards,
Yvan
You seem to have run only 10 iterations. Natural convection is usually quite slow to set in, so you probably need to run a much longer simulation (go by stages).
Especially, when the fluid is initially "at rest", there is no turbulent diffusion, but only molecular diffusion at start, so heat is transferred very slowly if you use a Dirichlet condition.
Regards,
Yvan
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kestutis
Re: Natural convection(buoyancy)
Hello,
I see no heat transfer between wall and domain, why?
Case file: https://www.dropbox.com/sh/1hyrhqvzpien77c/LZhu88LVcX top right click download -> as zip
Regards and thanks for help
Kestutis
I see no heat transfer between wall and domain, why?
- I did several simulations using:
Turbulence: Laminar, LES
Boundary: Smooth Wall, Rough Wall
Type: Prescribed Value, Coefficient
30 iterations, each 0.05s
Case file: https://www.dropbox.com/sh/1hyrhqvzpien77c/LZhu88LVcX top right click download -> as zip
Regards and thanks for help
Kestutis