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ISSN オンライン: 2642-0554

EFFECT OF INITIAL CONDITIONS ON TURBULENT STRUCTURES OF VARIOUS SCALES IN A WAKE

Hui Li
Department of Mechanical Engineering, Kagoshima University, Korimoto, Kagoshima, Japan

Yu Zhou
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Institute for Turbulence-Noise-Vibration Interaction and Control Shenzhen Graduate School, Harbin Institute of Technology Shenzhen, 518055, China

要約

The turbulent structures of various scales behind the solid and porous wake-generating bodies with the same characteristic dimension have been studies by the wavelet vector multi-resolution technique. Making a comparison of instantaneous sectional streamlines of various scales obtained with each wake generator, it is found that the behavior of large- and intermediate-scale structures in wakes depends on the initial conditions and the small-scale structures is independent of the initial conditions. The most significant contribution to Reynolds stress and turbulent energy appears to come from the large-scale and rib-like structures in the cylinder wake. In the screen wake, however, only the large-scale structure exhibits more contribution.