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-   -   wall & wall shadow net heat flux (http://www.cfd-online.com/Forums/fluent/41878-wall-wall-shadow-net-heat-flux.html)

Barbaros July 28, 2006 10:42

wall & wall shadow net heat flux
 
Hi all,

I have a simple 2-D geometry. On top of a wall there is a channel flow. There is heat flux coming into the wall. It looks like the following:

----------------------------------------------------

<--- fluid zone <---

----------------------------------------------------

| solid zone |

----------------------------------------------------

Fluent creates a shadow wall at the interface. I meshed the solid zone also to see the conduction. When I look at the heat flux at the interface wall and its shadow they are not the same. Even if I run more iterations it fluctuates around some number. For example for solid side it's -24W and for fluid side it's 20W. In terms of signs this makes sense; fluid is beig heated by the wall. But why there is such a difference? What is happening to the 4W?


bingbing August 5, 2006 02:00

Re: wall & wall shadow net heat flux
 
I have a same question,too. I gave the heat flux ratio of the bottom of solid zone.When I look at the temperature at the interface wall and its shadow they are not the same.For example for solid side it's -330K and for fluid side it's 340K.If I meshed the fluid zone with more grid cells,the temperature of the wall approaches to 340K.

So I suggest that you can mesh the boundary layer near the wall in the fluid zone.

my english is so poor!(yumen!)


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