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

JackW · April 11, 2013, 15:18

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, 04:19

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, 13:12

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!

sbaffini · April 18, 2013, 07:19

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

April 11, 2013, 15:18	Quick help on the Hoyas and Jimenez Channel (Re_tau = 2000)!	#1
JackW Member Jack Join Date: Aug 2012 Posts: 47 Rep Power: 13	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

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April 12, 2013, 04:19		#2
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,152 Blog Entries: 29 Rep Power: 39	The Reynolds stresses in the file are: u'+, v'+, w'+, uv'+, uw'+ and vw'+. A simple plot of these quantities will certify this.

April 16, 2013, 13:12		#3
JackW Member Jack Join Date: Aug 2012 Posts: 47 Rep Power: 13	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!

April 18, 2013, 07:19		#4
sbaffini Senior Member Paolo Lampitella Join Date: Mar 2009 Location: Italy Posts: 2,152 Blog Entries: 29 Rep Power: 39	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