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research-article

Effect of corner radius in stabilizing the low-Re flow past a cylinder

[+] Author and Article Information
Wei Zhang

Faculty of Mechanical Engineering and Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
zhangwei@zstu.edu.cn

Ravindra Samtaney

Mechanical Engineering, King Abdullah University of Science and Technology, 4700 KAUST, Thuwal 23955-6900, Saudi Arabia
ravi.samtaney@kaust.edu.sa

1Corresponding author.

ASME doi:10.1115/1.4037494 History: Received February 05, 2017; Revised July 16, 2017

Abstract

We perform global linear stability analysis on low-Re flow past an isolated cylinder with rounded corners. The objective of the present work is to investigate the effect of the cylinder geometry (corner radius) on the stability characteristics of the flow. Our investigation sheds light on new physics that the flow can be stabilized by partially rounding the cylinder in the critical and weakly super-critical flow regimes. The flow is first stabilized and then gradually destabilized as the cylinder varies from square to circular geometry. The sensitivity analysis reveals that the variation of stability is attributed to the different spatial variation trends of the backflow velocity in the near- and far-wake regions for various cylinder geometries. The results from the stability analysis are also verified with those of the direct simulations and very good agreement is achieved.

Copyright (c) 2017 by ASME
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