# Natural Convection

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 July 28, 2009, 23:29 Natural Convection #1 New Member   Maryam Kia shemshaki Join Date: Jul 2009 Posts: 5 Rep Power: 10 i want simulation natural convection loop by FLUENT but i have some problem. my result depend on intitial value?!!! What do i?

 July 29, 2009, 10:28 #2 New Member   zhangming Join Date: Jul 2009 Posts: 3 Rep Power: 10 Did you Set air density to be constant?

 July 30, 2009, 03:16 #3 New Member   Maryam Kia shemshaki Join Date: Jul 2009 Posts: 5 Rep Power: 10 working fluid is water & i use Boussinesq approximation for density

 July 30, 2009, 15:26 #4 Senior Member   Chris Join Date: Jul 2009 Location: Ohio, USA Posts: 169 Rep Power: 10 What do you mean when you say that your result depends on your initial value? Do you mean that you get a different result if you initialize your solution with different values for velocity?

 August 1, 2009, 00:56 #5 New Member   Maryam Kia shemshaki Join Date: Jul 2009 Posts: 5 Rep Power: 10 yes, if i put 300K for initial temperature i get in result (in temperature contour) 300k and if i put 320K for it i get 320

 August 1, 2009, 14:44 #6 Senior Member   Chris Join Date: Jul 2009 Location: Ohio, USA Posts: 169 Rep Power: 10 Have you checked the section in the FLUENT manual about natural convection to see if you have setup your simulation correctly? From what you are saying, it sounds like the temperature everywhere in the flow field is the same, meaning that there is probably something wrong with your setup. If in fact that's not what you're saying, could you please provide more information about your problem?

 August 2, 2009, 03:32 #7 New Member   Maryam Kia shemshaki Join Date: Jul 2009 Posts: 5 Rep Power: 10 i'm working in natural convection loop. The heat sink is located at an elevation higher than the source. That causes the circulating fluid, heated from bottom and cooled from top, to flow under the influence of gravity, the difference in fluid density between the two vertical arms being the drivingforce. heater(heat source) expose constant thermal flux and cooler(heat sink) exposed costant temperature.working fluid is water.

 August 4, 2009, 23:26 #8 New Member   Maryam Kia shemshaki Join Date: Jul 2009 Posts: 5 Rep Power: 10 is there anyone?

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