图书馆订阅: Guest
Third Symposium on Turbulence and Shear Flow Phenomena
June, 25-27, 2003, International Center, Sendai, Japan

DOI: 10.1615/TSFP3

DIRECT NUMERICAL SIMULATION OF IMPULSIVELY STARTED, AND UNIFORMELY ACCELERATED, PLATES USING ADAPTIVE WAVELET AND FOURIER METHODS WITH PENALISATION

pages 407-412
DOI: 10.1615/TSFP3.690
Get accessGet access

摘要

We present high resolution direct numerical simulation of 2D viscous incompressible flows past a flat plate. We study the shear layer instability of a flow past, either an impulsively started plate, or an uniformely accelerated plate, for Reynolds number Re = 9500. The numerical schemes are based on adaptive wavelet and Fourier pseudospectral methods with volume penalisation to take into account the plate with no-slip boundary conditions. The geometry of the plate is simply described by a mask function. We have chosen one tip of the plate to be rectangular while the other is a wedge with an angle of 30° degrees or a circluar shape. On both tips we observe the formation of thin shear layers which are rolling up into spirals and form two primary vortices. The selfsimilar scaling of the spirals corresponds with theoretical predictions of Saffman for the inviscid case [12]. At later times these vortices are advected downstream and the free shear layers undergo a secondary instability. We show that their formation and subsequent dynamics is highly sensitive to the shape of the tips. The numerical results agree well with observations from laboratory experiments. Finally we also check the influence of a small riblet being added on the back of the plate on the flow evolution.

Begell Digital Portal Begell 数字图书馆 电子图书 期刊 参考文献及会议录 研究收集 订购及政策 Begell House 联系我们 Language English 中文 Русский Português German French Spain