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Measurement of the Enstrophy and the Vorticity Vector in a Plane Cylinder Wake using a Spectral Method

Lennart Löfdahl (Institutionen för termo- och fluiddynamik) ; Bert Johansson (Institutionen för termo- och fluiddynamik) ; Jöran Bergh (Institutionen för matematik)
Fifth European Turbulence Conference in Siena, Italy, July 5-8 1994. (1994)
[Konferensbidrag, refereegranskat]

A method to determine derivative moments using only two slanted hot-wires and a spectral method has been employed for a complete determination of the enstrophy and the vorticity vector. The general idea behind the method is to minimize the measuring volume by use of only two hot-wires and to post-process the measured data. All measurements were conducted in the far wake of a cylinder at a Reynolds number of 1840. Comparisons between the spectral method and conventional measuring techniques are made, and the results justifies the approximation between enstrophy and dissipation. For the vorticity vector it was found that the components of the normal and lateral directions were considerably larger than the stream-wise ones.



Denna post skapades 2010-08-27.
CPL Pubid: 125288

 

Institutioner (Chalmers)

Institutionen för termo- och fluiddynamik (1989-2004)
Institutionen för matematik (1987-2001)

Ämnesområden

Strömningsmekanik

Chalmers infrastruktur