CFD Online Discussion Forums

CFD Online Discussion Forums (
-   FLUENT (
-   -   Wall Shadow interfering with Nusselt Number calculation? (

ryzd March 1, 2010 16:27

Wall Shadow interfering with Nusselt Number calculation?
Hi all,

I'm new to these forums, so I don't know if this question has already been answered. I am trying to create a benchmark test for natural convection in a 2D square cavity. I have a tube of hot water running along the left-hand wall of my square cavity and a tube of cold water running along the right-hand side of the cavity. There is a 50 degree temperature difference between the two tubes. The square cavity is filled with air and I have used a polynomial function to describe the density of the air. I'm comparing the Nusselt Number on the hot wall to a standard heat transfer correlation found in a Heat and Mass transfer book. My question is about the wall and wall-shadow that Fluent creates in the mesh. When I have fluent report the Nusselt number along the hot wall I get two very different numbers for the wall and the wall-shadow. Which number should I use? Or, should I use an average of the two?

Ganapathy March 3, 2010 07:16

If a wall is shared by two domains, then it will have a wall shadow.
Wall - will refer to the wall on one side (say in your case water or fluid)
Wall shadow - will refer to the other side (say air)

Thus you should decide which will be applicable.

All times are GMT -4. The time now is 19:30.