Problem in enabling buoyancy

hma11 · March 9, 2011, 09:40

Hi guys,
I'm not entirely new to Fluent but I have been working on it and I faced some problems.

How can I enable the buoyancy for a case?
I created a closed domain which represent a resrvoir of fluid and I tried to enable buoyancy to see the effects of natural convection on the temperatur distribution but with no success. Firstly, I enabled gravity in operating conditions and set the acceleration in the y-direction to -9.81. Secondly, I used Boussinesq Model for determing the density of the fluid which is water.
Conclusion, I can't see any variation in temperature between the bottom and the surface of the reservoir.

What I am doing wrong?
Thank you in advance.

xrs333 · March 12, 2011, 07:38

what thermal boundary conditions have you define?

hma11 · March 12, 2011, 08:30

I set the bottom wall to a temperature of 280K then for the top wall I tried 300k then heat flux of 1000,2000,3000 all gave same result

March 9, 2011, 09:40	Problem in enabling buoyancy	#1
hma11 New Member Join Date: Mar 2011 Posts: 2 Rep Power: 0	Hi guys, I'm not entirely new to Fluent but I have been working on it and I faced some problems. How can I enable the buoyancy for a case? I created a closed domain which represent a resrvoir of fluid and I tried to enable buoyancy to see the effects of natural convection on the temperatur distribution but with no success. Firstly, I enabled gravity in operating conditions and set the acceleration in the y-direction to -9.81. Secondly, I used Boussinesq Model for determing the density of the fluid which is water. Conclusion, I can't see any variation in temperature between the bottom and the surface of the reservoir. What I am doing wrong? Thank you in advance.

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March 12, 2011, 07:38		#2
xrs333 Senior Member xrs333 Join Date: Aug 2010 Posts: 125 Rep Power: 16	what thermal boundary conditions have you define?

March 12, 2011, 08:30		#3
hma11 New Member Join Date: Mar 2011 Posts: 2 Rep Power: 0	I set the bottom wall to a temperature of 280K then for the top wall I tried 300k then heat flux of 1000,2000,3000 all gave same result