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Natural Convection in a Vertical Confined Channel

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Old   January 11, 2024, 09:18
Default Natural Convection in a Vertical Confined Channel
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Hello,


I have the following problem that I have to analyse in ANSYS Fluent. I have to simulate the transient temperature field due to natural convection in a vertical confined channel. I have been provided with a geometry and mesh and I have to choose a viscous model, implement the boundary conditions and set up the transient analysis. I was provided with very little information as you can see in the attached file. To choose a viscous model I have to determine the Rayleigh number. To determine the Rayleigh number I need the characteristic length. I thought that the characteristic length in this case would be the distance that the air travels so the length from bottom to top (which is 1 meter). However, when I asked my supervisor, he told me that the length refers to the phenomenon so the pipe in vertical direction. I donít know what he means with this because the pipes have different diameters so I donít know which one I have to choose then for the characteristic length. Can someone help me what the best approach is here to determine the Rayleigh number and choose the best viscous model?


I was also given a temperature profile of the pipes over 120 seconds. I want to implement this in the boundary conditions but I donít know how. As I would prefer not to work with user defined functions, are there other options that I can use?



Thank you.
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natural convection, rayleigh number, transient 3d

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