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-   -   is there any difference between 2d and 3d in heat flux ? (http://www.cfd-online.com/Forums/fluent/110894-there-any-difference-between-2d-3d-heat-flux.html)

 malay December 24, 2012 07:33

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

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

 A7A December 26, 2012 01:30

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).

 LuckyTran December 28, 2012 12:41

Quote:
 Originally Posted by malay (Post 398892) 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 (Post 399025) 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.

 tshv247 May 6, 2016 02:26

Quote:
 Originally Posted by LuckyTran (Post 399336) 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.

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