# how to calculate Turbulent Length Scale

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 August 17, 2009, 02:16 how to calculate Turbulent Length Scale #1 New Member   labib Join Date: Jun 2009 Posts: 25 Rep Power: 8 Could any one please guide me on how to calculate the turbulent length scale in external flow..While doing k-omega turbulent modeling I chose Turbulent Intensity and Turbulent Length Scale Option. i enter the turbulent intensity about 0.07%. Please Help me in this regard. Thanks in Advance

 August 17, 2009, 03:50 #2 New Member   Join Date: Jul 2009 Posts: 3 Rep Power: 8 In the article by Lutz and al (AIAA J, Vol.45(4), p.779, 2007), among others, you can find an approximate formula combining different results from isotropic turbulence, Von Karman spectrum, etc... It reads: L = 0.387*(k_t^(3/2))/epsilon. You can also get from this the outer integral scale (or characteristic length of energy bearing eddies) as: Lambda = L/0.7468 (See the book by Mathieu and Scott, Introduction to Turbulent Flow, 2000) Hope this helps.

 August 18, 2009, 04:22 #3 New Member   labib Join Date: Jun 2009 Posts: 25 Rep Power: 8 ok thanks a lot of for your suggestion mr frank..

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