how to set bouyancy in closed doamin

eliminator · January 8, 2016, 05:10

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?

ghorrocks · January 10, 2016, 02:14

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.

eliminator · January 11, 2016, 01:46

ghorrocks · January 11, 2016, 06:39

That is not one of the better explanations I have seen

eliminator · January 11, 2016, 07:10

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

eliminator · January 11, 2016, 07:11

is it like bottom air and oil get heated and start moving downwards. as density is function of temperature in the buoyancy model.

eliminator · January 11, 2016, 07:12

sorry...i am unable to add images.

eliminator · January 11, 2016, 07:13

hope i explain my problem?

January 8, 2016, 05:10	how to set bouyancy in closed doamin	#1
eliminator New Member tushar Join Date: Mar 2015 Posts: 10 Rep Power: 11	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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January 10, 2016, 02:14		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	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.

January 11, 2016, 01:46		#3
eliminator New Member tushar Join Date: Mar 2015 Posts: 10 Rep Power: 11

January 11, 2016, 06:39		#4
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	That is not one of the better explanations I have seen

January 11, 2016, 07:10		#5
eliminator New Member tushar Join Date: Mar 2015 Posts: 10 Rep Power: 11	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

January 11, 2016, 07:11		#6
eliminator New Member tushar Join Date: Mar 2015 Posts: 10 Rep Power: 11	is it like bottom air and oil get heated and start moving downwards. as density is function of temperature in the buoyancy model.

January 11, 2016, 07:12		#7
eliminator New Member tushar Join Date: Mar 2015 Posts: 10 Rep Power: 11	sorry...i am unable to add images.

January 11, 2016, 07:13		#8
eliminator New Member tushar Join Date: Mar 2015 Posts: 10 Rep Power: 11	hope i explain my problem?