|November 3, 2009, 22:10||
Question about Reynold stress in LES
Join Date: Nov 2009
Posts: 2Rep Power: 0
I am using Large eddy simulation to simulate flow over a three-dimensional hill with a terrain following coordinate system. I need to calculate area-averaged (horizontal plane averaged) total stress (resolved+sgs) in the xz direction (x is the streamwise direction).
I have <uw> <u> <w> <txz> (txz is sgs stress) values for every grid points (<> means time-avergaed here). For the area-averaged stress, should I calculate tao=<uw>-<u><w>+<txz> for every grid point first, then interpolate tao to horizontal planes, and then take the average to get the stress I wanted or I should first interpolate <uw>,<u>,<w>,<txz> to horizontal planes respectively, then area average these four and then calculate calculate [<uw>]-[<u>][<w>]+[<txz>] to get the stress I need ( means horizontally averaged values).
Results from these two methods are very different, I am confused which one is correct
Thanks a lot
|Thread||Thread Starter||Forum||Replies||Last Post|
|question for LES||colopolo||Main CFD Forum||12||March 23, 2009 10:54|
|Basic LES question||toyCFD||Main CFD Forum||3||August 23, 2006 15:09|
|LES: mean wall shear stress||Francois||FLUENT||0||July 7, 2005 11:15|
|reynold stress model||yasir||FLUENT||0||August 16, 2004 08:51|
|How to calculate Reynolds Stress using LES data?||Jongdae Kim||Main CFD Forum||5||March 2, 2001 09:45|