# Question about Reynold stress in LES

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 November 3, 2009, 22:10 Question about Reynold stress in LES #1 New Member   Feng Join Date: Nov 2009 Posts: 2 Rep 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 (txz is sgs stress) values for every grid points (<> means time-avergaed here). For the area-averaged stress, should I calculate tao=-+ 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 ,,, to horizontal planes respectively, then area average these four and then calculate calculate []-[][]+[] 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

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