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Wall Shadow interfering with Nusselt Number calculation?

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Old   March 1, 2010, 15:27
Default Wall Shadow interfering with Nusselt Number calculation?
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Ryan Z. Davis
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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?
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Old   March 3, 2010, 06:16
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Ganapathy Iyer
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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.
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free convection, heat transfer, natural convection, nusselt number

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