# turbulent length scale

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 June 3, 2013, 11:16 turbulent length scale #1 Super Moderator     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,949 Blog Entries: 6 Rep Power: 33 Hi all, its a very simple question! Is the turbulence length-scale in OpenFOAM based on the mixing-length ? Its due to the fact of estimation of l l = d_hyd * 0.038 l = d_hyd * 0.07 I am not 100% sure what to use. In the past I thought that OF uses only the length-scale so I used always 0.038 Thanks in advance. Tobi

 June 3, 2013, 11:24 #2 Member   Join Date: Nov 2012 Posts: 72 Rep Power: 6 i dont know for what you need it excatly but for this BC turbulentMixingLengthDissipationRateInlet you need the mixinglength 0.07.

 June 3, 2013, 11:34 #3 Super Moderator     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,949 Blog Entries: 6 Rep Power: 33 Hi, thanks for your replay. I just wanted to know how to calculate the the length scale for the cfd-online calculator: http://www.cfd-online.com/Tools/turbulence.php But thanks for your replay. So I think I need to set up the mixingLength (0.07) for the omega BC too.

 July 23, 2013, 05:22 Looking for Reference #4 New Member   Abhishek Ramgadia Join Date: May 2009 Posts: 3 Rep Power: 10 Can you please provide me a reference from where you got the equations: l = d_hyd * 0.038 l = d_hyd * 0.07 Thanks in advance.

 July 23, 2013, 15:24 #5 Super Moderator     Tobias Holzmann Join Date: Oct 2010 Location: Leoben (Austria) Posts: 1,949 Blog Entries: 6 Rep Power: 33

 July 25, 2013, 01:01 #6 New Member   Abhishek Ramgadia Join Date: May 2009 Posts: 3 Rep Power: 10 Thanks Tobi, I had already seen that. I am looking for a literature (text book / journal paper) reference and not a web-page reference.

 October 11, 2016, 23:19 #7 New Member   UHGAR Join Date: Sep 2016 Posts: 9 Rep Power: 3 Hi, Foamers! Can I get your valuable suggestions? I would like to track the Turbulent length scales at every time step and at a particular location in flow field, and use it in paraFoam as well in quantitative post processing. How can I do it? How the length scales field will be created just like u,p, k etc., ? My main intention of doing this is, I wanted to compare my simulation jet (modeled by RANS) turbulent length scales with experimentally measured length scales. Thanks, UHGAR

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