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Wrong Reynolds stress in channel tutorial

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Old   September 7, 2009, 05:48
Exclamation Wrong Reynolds stress in channel tutorial
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Marco Turchi
Join Date: Jul 2009
Location: Pesaro, Italy
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I run channel tutorial in OpenFOAM 1.5.x, I make "postChannel", then I visualize the results... here we are some plots:

Umean:
Umean.jpg

It's quite good, but it seem to be a mix between a channel U mean profile and jet profile.

u_rms:
u_rms.jpg

v_rms:
v_rms.jpg

w_rms:
w_rms.jpg

uv:
uv.jpg

Fluctuations and Reynolds stress are totally wrong!!!
From the initial condition they grow up in the middle of the channel.
Have you any suggest?

I modify a little bit the tutorial. My channel is:
x*y*z: 3.5*2*2
nx*ny*nz: 80*180*120
nu: 4*10-5 (to have Re_tau ~ 180)

I use CrankNicholson for temporal interpolation and I try:
CrankNicholson 1
CrankNicholson 0.75
CranKNicholson 0.5

all lead to the results post.

Where am I wrong?

Thank you very much!
Best regard

MT
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