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-   -   Wrong Reynolds stress in channel tutorial (http://www.cfd-online.com/Forums/openfoam/68103-wrong-reynolds-stress-channel-tutorial.html)

zebu83 September 7, 2009 05:48

Wrong Reynolds stress in channel tutorial
 
5 Attachment(s)
I run channel tutorial in OpenFOAM 1.5.x, I make "postChannel", then I visualize the results... here we are some plots:

Umean:
Attachment 998

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

u_rms:
Attachment 999

v_rms:
Attachment 1001

w_rms:
Attachment 1002

uv:
Attachment 1000

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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