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Mechanism of a tilting in the longitudinal vortical structure of a homogeneous shear flow

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.100
pages 109-112

Oaki Iida
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan

N. Komeno
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan

Y. Tsukamoto
Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan

Yasutaka Nagano
Nagoya Industrial Science Research Institute; Department of Mechanical Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan

Abstract

Direct numerical simulations (DNSs) of a homogeneous shear flow are performed to study the detailed mechanism of the tilting of a longitudinal vortical structure typically observed in a turbulent shear flow. The longitudinal vortical structure, having the intense streamwise vorticity, is elongated in the streamwise direction, though it is also tilted in the spanwise direction. The sense of this tilting is determined by the sense of the streamwise vorticity. Although it is known that the tilting is due to the combined effects of the non-linear terms and mean spanwise vorticity, its detailed mechanism is still unknown. By systematically changing the Reynolds number of the flow as well as imposing a spanwise system rotation, we investigated the effects of the non-linear term and spanwise rotation on the tilting.

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