# Turbulent length scale

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 February 22, 2017, 19:33 Turbulent length scale #1 Senior Member   Join Date: Aug 2014 Posts: 129 Rep Power: 5 Can somebody confirm me that the turbulent length scale that we need to input as a inlet condition (with the turbulent intensity) corresponds well to integral scale which is the size of the largest eddies and which is also to be found in this formula: where is the Kolmogorov scale. The reason I ask is that there is a lot of notation for turbulent length scale: , , , , etc. Thank you for your help !

 February 23, 2017, 02:12 #2 Senior Member     Uwe Pilz Join Date: Feb 2017 Location: Leipzig, Germany Posts: 271 Rep Power: 4 is the length of the large eddies. It should not be larger than (the size of the problem) of course. can be guessed. For pipe flows: is the hydraulic diameter, which is identical the diameter for round pipes. For rectangular ones: For flow around / past bodies: is the size of the problem, for cylinders and spheres the diameter, for other bodies the diameter of the flow directed area. __________________ Uwe Pilz -- Sie ahnen nicht, wieviel Poesie in der Berechnung einer Logarithmentafel enthalten ist (Carl Friedrich Gauß)

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