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Old   March 10, 2010, 07:16
Default Wind turbulence measurement
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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 its working. Its output results are also very suspicious.
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Old   March 10, 2010, 08:58
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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
Im 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
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Old   March 10, 2010, 10:49
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Quote:
Originally Posted by Linh.Hoang View Post
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
Im 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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