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Help with Length Scale estimation/perforated plate

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Old   February 19, 2004, 18:01
Default Help with Length Scale estimation/perforated plate
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NHP
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Hi! I am a beginner, and I need some help with length scales. What exactly are length scales? I saw an equation of l=0.07L. What is l? Also for a perforated plate, is L the thickness of the plate? What I understand is that downstream of the perforated plate I need to have cells of length around 7% of the thickness of the plate. Is this correct?
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Old   February 20, 2004, 07:30
Default Re: Help with Length Scale estimation/perforated p
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NHP
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Please this is urgent. I cannot believe nobody knows anything about length scales?!?!
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Old   February 20, 2004, 08:40
Default Re: Help with Length Scale estimation/perforated p
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Anon
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l is the turbulence length scale, related to the size of the large eddies in a turbulent flow.

For a fully developed duct flow, l is restricted by the duct size, L, typically, the hydraulic diameter.
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Old   February 20, 2004, 10:24
Default Re: Help with Length Scale estimation/perforated p
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NHP
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Thanks Do you know anything about an obstruction in the flow like a perforated plate, what L would be in that case?
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