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Archimedes number

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Old   September 17, 2012, 07:16
Default Archimedes number
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hayder
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Hi

I need to find Archimedes number for the flow around building ,the flow is simulate by using a CFD model for wind tunnel ,What I could not found is the characteristic length and velocity . I know in the real flow the characterstics length is the thickness of boundary layer but I don`t know how to calculate it in sofware
Thanks in advance
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