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Tobi June 3, 2013 11:16

turbulent length scale
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.

Henning86 June 3, 2013 11:24

i dont know for what you need it excatly but for this BC


you need the mixinglength 0.07.

Tobi June 3, 2013 11:34


thanks for your replay.

I just wanted to know how to calculate the the length scale for the cfd-online calculator:

But thanks for your replay. So I think I need to set up the mixingLength (0.07) for the omega BC too.

abhishekramgadia July 23, 2013 05:22

Looking for Reference
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.

Tobi July 23, 2013 15:24


abhishekramgadia July 25, 2013 01:01

Thanks Tobi,
I had already seen that.
I am looking for a literature (text book / journal paper) reference and not a web-page reference.

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