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-   -   Quick help on the Hoyas and Jimenez Channel (Re_tau = 2000)! (http://www.cfd-online.com/Forums/main/116045-quick-help-hoyas-jimenez-channel-re_tau-2000-a.html)

JackW April 11, 2013 16:18

Quick help on the Hoyas and Jimenez Channel (Re_tau = 2000)!
 
Hi Guys,

I have to ask this any help would be great! I am looking to calculate the invariant map III-II for a RANS against the DNS data here:

http://torroja.dmt.upm.es/channels/d...es/Re2000.prof

however I need the Reynold's stress. Unfortunately I am unsure as to how to calculate this from the available data (the headers have confused me! <- annoyed in myself!)

Best wishes,

Jack

sbaffini April 12, 2013 05:19

The Reynolds stresses in the file are:

u'+, v'+, w'+, uv'+, uw'+ and vw'+.

A simple plot of these quantities will certify this.

JackW April 16, 2013 14:12

Hi, just incase anyone else has this question they are the RMS (root mean square) values of u_i u_j, called the turbulence intensities by the authors (but intensity is typically divided by U) - so to get the Reynold's stresses simply square the values

ps. sbaffini - I thought they were Reynold's stresses at first too! :cool:

sbaffini April 18, 2013 08:19

That's how you will more probably find them in any DNS database (all the ones i know). I tought you were unsure about the colums to pick up


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