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 Vaulter March 10, 2010 07:16

Wind turbulence measurement

Hi,
How can one measure wind turbulence in PHOENICS.
I add up (stored of TINT is KE^0.5/VABS with IMAT<100) in “IN FORM7” for turbulence intensity but I don't know what it means and how it’s working. Its output results are also very suspicious.

 Linh.Hoang March 10, 2010 08:58

Hi Vaulter,
to calculate the turbulence intensity you just need KE.
For isotropic turbulence: KE=0.5*(u'**2+v'**2+w'**2) = 0.5*(3 u'**2).
the turbulence Intensity: I=u'/Vabs= SQRT(3/2*KE)/Vabs.

(stored of TINT is KE^0.5/VABS with IMAT<100)
means that you store a new variable named TINT and that TINT= SQRT(KE)/Vabs
I´m not quite sure why you choose this formula i would recommend the one i mentioned above.

If you want to model the Wind just try the Wind Object (see POLIS)

Linh

 Vaulter March 10, 2010 10:49

Quote:
 Originally Posted by Linh.Hoang (Post 249349) Hi Vaulter, to calculate the turbulence intensity you just need KE. For isotropic turbulence: KE=0.5*(u'**2+v'**2+w'**2) = 0.5*(3 u'**2). the turbulence Intensity: I=u'/Vabs= SQRT(3/2*KE)/Vabs. (stored of TINT is KE^0.5/VABS with IMAT<100) means that you store a new variable named TINT and that TINT= SQRT(KE)/Vabs I´m not quite sure why you choose this formula i would recommend the one i mentioned above. If you want to model the Wind just try the Wind Object (see POLIS) Linh
Thanks Linh I will check it out...

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