# is there any difference between 2d and 3d in heat flux ?

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 December 24, 2012, 07:33 is there any difference between 2d and 3d in heat flux ? #1 Senior Member   ahmad Join Date: Feb 2012 Posts: 101 Rep Power: 12 is there any difference between 2d and 3d in heat flux ? I mean for example if i have a heat flux= 90 watt per square meter in 3d , what value in 2d i must put in fluent ? thank you

 December 26, 2012, 01:30 #2 Member   AHMAD Join Date: Apr 2012 Posts: 54 Rep Power: 0 When you work with 2d simulation, fluent take a default value of z which is z=1[m], so the area of the heated surface will be computed this way, and the total heat flux will differ depending on the area. But if you were studying problems related to calculating heat transfer coefficient, there shouldn't be any difference(unless there is secondary flows in the z direction).

December 28, 2012, 12:41
#3
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Lucky
Join Date: Apr 2011
Location: Orlando, FL USA
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Quote:
 Originally Posted by malay is there any difference between 2d and 3d in heat flux ? I mean for example if i have a heat flux= 90 watt per square meter in 3d , what value in 2d i must put in fluent ? thank you
Use the same heat flux.

Quote:
 Originally Posted by A7A When you work with 2d simulation, fluent take a default value of z which is z=1[m], so the area of the heated surface will be computed this way, and the total heat flux will differ depending on the area.
Heat flux does not depend on area. I think you meant total heat.

May 6, 2016, 03:26
#4
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Sri
Join Date: Oct 2011
Posts: 13
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Quote:
 Originally Posted by LuckyTran Use the same heat flux. Heat flux does not depend on area. I think you meant total heat.
Hi,

I have similar issue. I have 'x' W over a surface (from 3D). How should this x applied over a line (for 2D simulation)? If I apply the same vaue, I get very high temp.
Thanks.

 September 21, 2022, 12:55 #5 New Member   Join Date: Sep 2021 Posts: 3 Rep Power: 3 I am running into a similar issue - high temperature values when using the 3D heat flux in 2D. Is there something I'm missing here?

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