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-   -   How to evaluate length scale for a pipe flow (http://www.cfd-online.com/Forums/fluent/45767-how-evaluate-length-scale-pipe-flow.html)

kb August 18, 2007 09:24

How to evaluate length scale for a pipe flow
 
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?

Regards Kb

AAA August 19, 2007 14:06

Re: How to evaluate length scale for a pipe flow
 
Hi

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


kb August 21, 2007 07:49

Re: How to evaluate length scale for a pipe flow
 
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?


AAA August 21, 2007 13:14

Re: How to evaluate length scale for a pipe flow
 
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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