Flow around circular cylinders

Flow around circular cylinders

15 Feb 2016-Iss: 1

TL;DR: Flow around circular cylinders as mentioned in this paper, Flow around circular cylindrical cylinders, Flowaround circular cylinders, مرکز فناوری اطلاعات and اسلاز رسانی.

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Abstract: Flow around circular cylinders , Flow around circular cylinders , مرکز فناوری اطلاعات و اطلاع رسانی کشاورزی

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Journal Article•DOI•

Distant touch hydrodynamic imaging with an artificial lateral line

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Yingchen Yang¹, Jack Chen¹, Jonathan Engel¹, Saunvit Pandya¹, Nannan Chen¹, Craig Tucker¹, Sheryl Coombs², Douglas L. Jones¹, Chang Liu¹ - Show less +5 more•Institutions (2)

University of Illinois at Urbana–Champaign¹, Bowling Green State University²

12 Dec 2006-Proceedings of the National Academy of Sciences of the United States of America

TL;DR: It is shown that the artificial lateral line can successfully perform dipole source localization and hydrodynamic wake detection and enables a distant touch hydrod dynamic imaging capability to critically augment sonar and vision systems.

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Abstract: Nearly all underwater vehicles and surface ships today use sonar and vision for imaging and navigation. However, sonar and vision systems face various limitations, e.g., sonar blind zones, dark or murky environments, etc. Evolved over millions of years, fish use the lateral line, a distributed linear array of flow sensing organs, for underwater hydrodynamic imaging and information extraction. We demonstrate here a proof-of-concept artificial lateral line system. It enables a distant touch hydrodynamic imaging capability to critically augment sonar and vision systems. We show that the artificial lateral line can successfully perform dipole source localization and hydrodynamic wake detection. The development of the artificial lateral line is aimed at fundamentally enhancing human ability to detect, navigate, and survive in the underwater environment.

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185 citations

Journal Article•DOI•

A review of the Magnus effect in aeronautics

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Jost Seifert

01 Nov 2012-Progress in Aerospace Sciences

TL;DR: A review of the application of the Magnus effect devices and concepts in aeronautics can be found in this article, where the authors conclude that future challenges in their application are discussed.

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147 citations

Cites background from "Flow around circular cylinders"

...It is known that vortex shedding occurs for Reynolds numbers all the way up to at least Re1⁄48 10(6) [25]....
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...The most comprehensive review of work on rotating cylinders is given in the books of Zdravkovich [25,26]....
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Journal Article•DOI•

Unsteady aerodynamic forces estimation on a square cylinder by TR-PIV

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Dilek Funda Kurtulus¹, Fulvio Scarano², Laurent David•Institutions (2)

Middle East Technical University¹, Delft University of Technology²

01 Jan 2007-Experiments in Fluids

TL;DR: In this article, the authors investigated the aerodynamic forces acting on a square cross-sectional cylinder by means of time-resolved particle image velocimetry (TR-PIV) at Reynolds number 4,900.

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Abstract: The unsteady aerodynamic forces acting on a square cross-sectional cylinder are investigated by means of time-resolved particle image velocimetry (TR-PIV) at Reynolds number 4,900. The objective of the investigation is to prove the feasibility of non-intrusive force measurements around two-dimensional bodies. The PIV measurements performed at a rate of 1 kHz enable a time resolved (TR) description of the vortex shedding phenomenon occurring at 10 Hz and to follow the time evolution of vortex dominated wake. The instantaneous aerodynamic force coefficients are obtained from the integration of the force equations within a control volume enclosing the object. The required instantaneous pressure distribution is inferred making use of two physical models: Bernoulli relation is adopted in the potential slowly-evolving flow region; in the turbulent wake, the Navier–Stokes equations are invoked to determine the pressure gradient spatial distribution, which integrated in space yields the pressure distribution. The spatial acceleration field is directly obtained from the temporal difference of the time-filtered velocity field. For a choice of the control volume approximately one model height away from the surface the contributions to the aerodynamic forces coming from the different terms of the force equation are individually examined. The convective term dominates the unsteady lift forces whereas the pressure term prevails for the drag. The temporal evolution of C L returns a clear periodic pattern in phase with the vortex shedding at a frequency of 10.1 Hz (Strouhal number St = 0.128) with oscillation amplitude of 0.9, whereas C D barely shows periodicity. The measurement uncertainties associated to the evaluation of all the terms in the force equation and especially in relation to TR-PIV measurements are discussed.

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115 citations

Cites background from "Flow around circular cylinders"

...A detailed flow field description around circular cylinders can be found in Zdravkovich (1997)....
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...in Zdravkovich (1997). At Reynolds numbers in the order of 100 the Karman vortex street dominates the wake unsteadiness with periodic shedding of counterrotating spanwise aligned vortices....
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Journal Article•DOI•

Study of heat-transfer on the surface of a circular cylinder in flow using an immersed-boundary method

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Ning Zhang¹, Z.C. Zheng², Steven J. Eckels²•Institutions (2)

McNeese State University¹, Kansas State University²

01 Dec 2008-International Journal of Heat and Fluid Flow

TL;DR: In this article, an immersed-boundary method was extended to study heat transfer problems of flow over a circular cylinder and the effect of heat transfer enhancement for flow over transversely oscillating cylinders was investigated.

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108 citations

Cites background or methods from "Flow around circular cylinders"

...According to Zdravkovich (1997), at the low-Reynolds-number range of Re 6 50 the vortex structure in the wake is steady and symmetric, thus the temperature field shows similar steady and symmetric characteristics....
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...Details of the computational scheme for the velocity field and determination of fm have been shown by Zhang and Zheng (2007). The governing equations, Eqs. (1) and (2), are discretized using the first-order time-marching, with a semi-implicit term for the diffusion terms and the second-order Adams-Bashforth for convection and central differencing for diffusion. The procedure involves a two-step, predictor–corrector procedure. The two Poisson equations at each time step are solved using the Fishpack subroutines (1979) and Swarztrauber and Sweet (1979)....
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...Details of the computational scheme for the velocity field and determination of fm have been shown by Zhang and Zheng (2007). The governing equations, Eqs....
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Journal Article•DOI•

Numerical simulation and experimental validation for energy harvesting of single-cylinder VIVACE converter with passive turbulence control

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Lin Ding¹, Lin Ding², Li Zhang², Michael M. Bernitsas¹, Che Chun Chang¹ - Show less +1 more•Institutions (2)

University of Michigan¹, Chongqing University²

01 Jan 2016-Renewable Energy

TL;DR: In this article, passive Turbulence Control (PTC) in the form of roughness strips is applied to enhance FIM and increase the efficiency of the VIVACE converter in harnessing marine hydrokinetic energy.

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105 citations

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Flow around circular cylinders

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