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Hydraulic Diameter or Length Scale

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Old   June 11, 2004, 09:43
Default Hydraulic Diameter or Length Scale
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Bob
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I am simulating a 3D gas turbine combustor. What would be the best to use length scale or hydraulic diameter. My first run will be non-reacting. Also, if I use length scale would I choose the height or the width of the outlet. Or maybe it would be better to use the viscosity ratio. Most of the tutorials are 2D and with 3D this issue has always been confusing to me. Any help will be appreciated.
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Old   June 11, 2004, 09:49
Default Re: Hydraulic Diameter or Length Scale
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Tom
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I would use Hydraulic Diameter and take the diameter as that of the outlet/inlet.
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Old   June 11, 2004, 10:56
Default Re: Hydraulic Diameter or Length Scale
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Bob
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Now, would I use the height of the outlet or the length?
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Old   June 17, 2004, 09:13
Default Re: Hydraulic Diameter or Length Scale
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martin
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In Fluent there is a simple relation between length scale and characteristic dimension (diameter): l=0.07*L
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