A numerical study of flow patterns, drag and lift for low reynolds number flow past tandem cylinders of various shapes

Yidan Song; Rui Zhu; Terrence Simon; Gongnan Xie

doi:10.1115/IMECE2017-70089

A numerical study of flow patterns, drag and lift for low reynolds number flow past tandem cylinders of various shapes

Yidan Song, Rui Zhu, Terrence Simon, Gongnan Xie

Mechanical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

2 Scopus citations

Abstract

The flow over two different shaped bluff bodies in tandem arrangement was numerically investigated by using the finite volume method with Computational Fluid Dynamics (CFD) techniques. The shape of the downstream main bluff body is a right circular cylinder, with shape unchanged, while the shape of the upstream bluff body varies between: circle, triangle, square, ellipse and cylindrical half-shell. The hydraulic diameters of both front and rear bluff bodies are equal. The analysis is carried out for Reynolds numbers of 100, 300 and 500, and center-tocenter distance ratios, L/D, of 1.5, 2, 3, 4.5 and 6. Flow characteristics in terms of the lift and drag coefficients and Strouhal number are analyzed and the vortex shedding patterns around the bluff bodies are described. The influence of the shape of the fore cylinder on the flow characteristics is the innovation point of this paper. It is concluded that the center-to-center distance ratio, L/D, and the shape of the upstream bluff body have important effects on the drag and lift coefficients, vortex shedding frequencies from the two bluff bodies, and flowfield characteristics.

Original language	English (US)
Title of host publication	Fluids Engineering
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791858424
DOIs	https://doi.org/10.1115/IMECE2017-70089
State	Published - 2017
Event	ASME 2017 International Mechanical Engineering Congress and Exposition, IMECE 2017 - Tampa, United States Duration: Nov 3 2017 → Nov 9 2017

Publication series

Name	ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume	7

Other

Other	ASME 2017 International Mechanical Engineering Congress and Exposition, IMECE 2017
Country/Territory	United States
City	Tampa
Period	11/3/17 → 11/9/17

Bibliographical note

Funding Information:
This work was supported by National Natural Science Foundation of China (51676163), by the Fundamental Research Funds of Shaanxi Province (2015KJXX-12).

Publisher Copyright:
Copyright © 2017 ASME.

Keywords

Drag force
Flow dynamics
Hydrodynamic forces
Lift force
Low-Reynolds number
Tandem bluff-bodies
Vortex shedding

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10.1115/IMECE2017-70089

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Song, Y., Zhu, R., Simon, T., & Xie, G. (2017). A numerical study of flow patterns, drag and lift for low reynolds number flow past tandem cylinders of various shapes. In Fluids Engineering (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 7). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2017-70089

A numerical study of flow patterns, drag and lift for low reynolds number flow past tandem cylinders of various shapes. / Song, Yidan; Zhu, Rui; Simon, Terrence et al.
Fluids Engineering. American Society of Mechanical Engineers (ASME), 2017. (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 7).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Song, Y, Zhu, R, Simon, T & Xie, G 2017, A numerical study of flow patterns, drag and lift for low reynolds number flow past tandem cylinders of various shapes. in Fluids Engineering. ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), vol. 7, American Society of Mechanical Engineers (ASME), ASME 2017 International Mechanical Engineering Congress and Exposition, IMECE 2017, Tampa, United States, 11/3/17. https://doi.org/10.1115/IMECE2017-70089

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AB - The flow over two different shaped bluff bodies in tandem arrangement was numerically investigated by using the finite volume method with Computational Fluid Dynamics (CFD) techniques. The shape of the downstream main bluff body is a right circular cylinder, with shape unchanged, while the shape of the upstream bluff body varies between: circle, triangle, square, ellipse and cylindrical half-shell. The hydraulic diameters of both front and rear bluff bodies are equal. The analysis is carried out for Reynolds numbers of 100, 300 and 500, and center-tocenter distance ratios, L/D, of 1.5, 2, 3, 4.5 and 6. Flow characteristics in terms of the lift and drag coefficients and Strouhal number are analyzed and the vortex shedding patterns around the bluff bodies are described. The influence of the shape of the fore cylinder on the flow characteristics is the innovation point of this paper. It is concluded that the center-to-center distance ratio, L/D, and the shape of the upstream bluff body have important effects on the drag and lift coefficients, vortex shedding frequencies from the two bluff bodies, and flowfield characteristics.

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A numerical study of flow patterns, drag and lift for low reynolds number flow past tandem cylinders of various shapes

Abstract

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