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How to evaluate length scale for a pipe flow

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Old   August 18, 2007, 09:24
Default How to evaluate length scale for a pipe flow
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kb
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Hi I want to use the turbulence intensity and length scale in my turbulence specification method but I do not know how to estimate the length scale value? knowing that I have a 3D pipe with diameter 0.0985 m?

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Old   August 19, 2007, 14:06
Default Re: How to evaluate length scale for a pipe flow
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AAA
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Hi

The length scale is usually the length of the opening, which is the diameter in your case.

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Old   August 21, 2007, 07:49
Default Re: How to evaluate length scale for a pipe flow
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kb
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Hi AAA thanks to the reply. If it the diameter what you think should I multiply it then by 0.07 or no? I saw in the manual that length scale=0.07 * l? what you say?

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Old   August 21, 2007, 13:14
Default Re: How to evaluate length scale for a pipe flow
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AAA
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Hi

You are right (I was wrong!). Since you have a pipe flow, the turbulence length scale is the pipe diameter multiplied by 0.07.

Regards

AAA
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