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Natural convection of water

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Old   October 26, 2014, 15:05
Default Natural convection of water
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amine
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Hello,
I dident get the good results when modeling natural convection into 2D cavity filled with water, using ansys Fluent 6.3, Boussinesq approximation, Laminar flow, steady case

Any suggestions to overcome this drawbacks???
Thank you in advance
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Old   October 27, 2014, 02:06
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Did you specify gravity?
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Old   October 27, 2014, 12:18
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Quote:
Originally Posted by dreamz View Post
Did you specify gravity?
Hello dreamz,
Thak you for replying!
yes i did.
the problem that the isotherms are parallel (it looks like conduction isotherms), when i compared with results found in literature, it was pretty much different!!!
All the best
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Old   October 27, 2014, 12:40
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Is it possible for you to share your dimensions.. Or else I will try with my own dimensions and will get back to you..
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Old   October 27, 2014, 15:38
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Could you please paste your isotherms here ??? and the thermophysical properties for water ???
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Old   October 27, 2014, 22:43
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I am working on it.. I have kept the side walls at hot and cold temperatures each and the top and bottom walls at room temperature.. Are these okay for you or you are using some different boundary conditions?
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Old   October 28, 2014, 02:18
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Horizontal walls kept adiabatic, the others are differentially heated,,, but i wanna know the thermophysical properties you're working with!
Thanx
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Old   October 29, 2014, 08:40
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I have got convergence for your problem. I use water (l) which is in the fluent database under materials. Under density I select boussinesq approximation with density value corresponding to my ref. Temperature. Thermal expansion, I have specified as corresponding to ref temp. Tell me for what values of grashof number are you looking for results?
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