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

Wei Zhang | Zendy; Ravi Samtaney | Zendy

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

Author(s) -

Wei Zhang,

Ravi Samtaney

Publication year - 2017

Publication title -

journal of fluids engineering

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.529

H-Index - 103

eISSN - 1528-901X

pISSN - 0098-2202

DOI - 10.1115/1.4037494

Subject(s) - cylinder , backflow , radius , potential flow around a circular cylinder , supercritical flow , flow (mathematics) , mechanics , wake , geometry , physics , materials science , mathematics , open channel flow , geology , inlet , computer security , computer science , geomorphology

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

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