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Velocity profile at inlet

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Old   May 3, 2012, 08:37
Default Velocity profile at inlet
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siw
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Hi,

I'm trying to make an expression on an inlet rectagular face. The image shows a 2-D slice. The inlet velocity profile is to be the 1/7 power law.

I cannot see an expression that will define the entire profile so have made this expresssion for the inlet velocity, u:

H = 1 [m]

if (y <= H , U*((y/H)^0.143) , ???? )

But I cannot get the correct equation for the top half of the velocity profile (dashed in the image).

Can any one help as I sure this has been done lots of times but I cannot get a decreasing power curve as needed.

Thanks
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File Type: jpg Power law velocity profile.jpg (31.0 KB, 25 views)
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Old   May 3, 2012, 09:26
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Edmund Singer P.E.
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For the upper portion it is a simple translation of the y. For y>H replace y with (2H-y)
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Old   May 3, 2012, 09:30
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siw
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Thanks,

I've just got that myself. It's been one of those days.

Last edited by siw; May 3, 2012 at 10:21.
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