Is negative turbulence intensity right?
Hi all....
I have doubt about definition of turbulence intensity when I try to compare CFD turbulence profile with my experiment. TI= u'_RMS(x)/U_mean(x) Should I take absolute value of U_mean(x) while calculating U_mean(x)? CFD shows reverse flow (negative velocity) at some locations. Thanks for help. |
Re: Is negative turbulence intensity right?
Turbulence inensity is always positive.
You should take the absolute value of the mean flow velocity. Check out the CFD-Wiki page on turbulence intensity for a more comprehensive definition. You can find it here: http://www.cfd-online.com/Wiki/Turbulence_intensity |
Re: Is negative turbulence intensity right?
Jonas is correct, but I rather say (like in the Wiki information that Jonas added recently) that you should take the speed or norm of the transient averaged velocity vector, i.e. U .
Absolute value of a vector is a generalization and may confuse those not used to it.. I rather say the norm of the velocity vector or speed. good luck, Opaque. |
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