Effect of Corner Radius in Stabilizing the Low-Re Flow Past a Cylinder

被引：10

作者：

Zhang, Wei ^{[1
]}

Samtaney, Ravi ^{[2
]}

机构：

[1] Zhejiang Sci Tech Univ, Fac Mech Engn & Automat, Hangzhou 310018, Zhejiang, Peoples R China

[2] King Abdullah Univ Sci & Technol, Mech Engn, KAUST 4700, Thuwal 239556900, Saudi Arabia

来源：

JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME | 2017年 / 139卷 / 12期

基金：

中国国家自然科学基金;

关键词：

SQUARE CYLINDER; CIRCULAR-CYLINDER; WAKE; SENSITIVITY; INSTABILITY; PREDICTION; SIMULATION;

D O I：

10.1115/1.4037494

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

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 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 supercritical 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.

引用

页数：11

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