Wired velocity vectors out of the box

saam85 · March 31, 2015, 00:40

Hi everyon,

I am trying to model the natural convection in a simple box with water inside. I have seen velocity vectors which come outside of the ceiling of the box as you can see by clicking the link --> http://postimg.org/image/fotdz89hb/! Any idea where does it come from?

Best,
Ali

Alex C. · March 31, 2015, 07:36

It looks like your top boundary condition is not properly applied.

What is the boundary condition to the top?

saam85 · March 31, 2015, 19:53

Dear Alex,

It is adiabatic, so I considered constant heat flux as well as heat generation equal to zero for that.

March 31, 2015, 00:40	Wired velocity vectors out of the box	#1
saam85 New Member Ali Join Date: Mar 2015 Posts: 2 Rep Power: 0	Hi everyon, I am trying to model the natural convection in a simple box with water inside. I have seen velocity vectors which come outside of the ceiling of the box as you can see by clicking the link --> http://postimg.org/image/fotdz89hb/! Any idea where does it come from? Best, Ali

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March 31, 2015, 07:36		#2
Alex C. Member Join Date: Jul 2013 Posts: 55 Rep Power: 12	It looks like your top boundary condition is not properly applied. What is the boundary condition to the top?

March 31, 2015, 19:53		#3
saam85 New Member Ali Join Date: Mar 2015 Posts: 2 Rep Power: 0	Dear Alex, It is adiabatic, so I considered constant heat flux as well as heat generation equal to zero for that.