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how to set bouyancy in closed doamin

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Old   January 8, 2016, 05:10
Post how to set bouyancy in closed doamin
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tushar
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I am simulating a case with tank filled with oil and air outside the tank. there is some heat source inside tank. While setting buoyancy in tank vector plot shows arrow upwards means motion of oil in upward direction. whats is possible solution to get right motion direction?
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Old   January 10, 2016, 02:14
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Glenn Horrocks
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I have no idea. Unless you explain what you aer diong we don't have much chance of helping you.

Please post an image or what you are modelling, an image of your mesh and your CCL.
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Old   January 11, 2016, 01:46
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Old   January 11, 2016, 06:39
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That is not one of the better explanations I have seen
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Old   January 11, 2016, 07:10
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Actual there is one closed tank filled with oil and some heat source inside tank. and outside of tank natural air convection.

i have activated buoyancy in outer air and inner oil domain both. air and oil both should move upward as i stated -g in z-direction. but intermediate result shows air moving downward towards ground. and at the same time convergence is very slow... though mesh is refine and quality more than 0.3
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Old   January 11, 2016, 07:11
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is it like bottom air and oil get heated and start moving downwards. as density is function of temperature in the buoyancy model.
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Old   January 11, 2016, 07:12
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sorry...i am unable to add images.
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Old   January 11, 2016, 07:13
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hope i explain my problem?
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