Journal ArticleDOI
Transverse flow over a wavy cylinder
Anwar Ahmed,Byram Bays‐Muchmore +1 more
TLDR
In this paper, surface pressure distributions and flow visualizations were obtained for a set of wavy cylinders with different axial wavelengths, and significant spanwise pressure gradients were present, resulting in three-dimensional separation lines and the formation of streamwise trailing vortex structures near the geometric nodes.Abstract:
Transverse flow over a wavy cylinder was investigated experimentally; surface‐pressure distributions and flow visualizations were obtained for a set of wavy cylinders with different axial wavelengths. Significant spanwise pressure gradients were present, resulting in three‐dimensional separation lines and the formation of streamwise trailing vortex structures near the geometric nodes. Despite the symmetry of the geometries, the separated flow structures near the geometric nodes were distinctly asymmetric a large fraction of time. Integration of the pressure data revealed greater sectional drag coefficients at the geometric nodes than at the geometric saddles.read more
Citations
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Journal ArticleDOI
Distributed forcing of flow over a circular cylinder
Jinsung Kim,Haecheon Choi +1 more
TL;DR: In this article, the authors applied a distributed (i.e., spatially varying) forcing to flow over a circular cylinder for drag reduction, which is realized by a blowing and suction from the slots located at upper and lower surfaces of the cylinder.
Journal ArticleDOI
Three-dimensional nature of vortices in the near wake of a wavy cylinder
TL;DR: In this article, the authors investigated the effect of small degrees of spanwise waviness on the wake of a wavy cylinder and found that a small degree of sparseness could have a significant effect on drag reduction and a corresponding suppression of cylinder vibration.
Journal ArticleDOI
Large-eddy simulation of the compressible flow past a wavy cylinder
TL;DR: In this article, the authors used large-eddy simulation for a free-stream Mach number M ∞ = 0.75 and a Reynolds number based on the mean diameter Re = 2 × 10 5.
Journal ArticleDOI
Experimental investigation of the mean and fluctuating forces of wavy (varicose) cylinders in a cross-flow
TL;DR: In this paper, the effects of surface waviness of wavy cylinders on mean drag and fluctuating lift reduction were experimentally investigated in a low speed wind tunnel having a 0.6m×0.6mm cross-section and a free-stream turbulence intensity less than 0.2%.
Journal ArticleDOI
Large eddy simulation of flow around wavy cylinders at a subcritical Reynolds number
TL;DR: In this paper, the mean flow field and the near wake flow structures are presented and compared with those of a circular cylinder at the same Reynolds number, and the mean pressure distributions are also calculated.
References
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Journal ArticleDOI
Numerical study and physical analysis of the pressure and velocity fields in the near wake of a circular cylinder
M. Braza,P. Chassaing,H. Ha Minh +2 more
TL;DR: In this paper, the authors investigated the dynamic characteristics of the pressure and velocity fields of the unsteady incompressible laminar wake behind a circular cylinder, and the initiation mechanism for vortex shedding and evaluation of the body forces are presented for Reynolds-number values of 100, 200 and 1000.
Measurements of base pressure in the wake of a cylinder at low Reynolds numbers
TL;DR: In this article, it was shown that the level of base suction is affected in only a minor fashion by whether parallel or oblique shedding is present, and it was found that the data are independent of the base pressure hole sizes and cylinder diameters that were used.
Journal ArticleDOI
Three-dimensionality of organized structures in a plane turbulent wake
Michio Hayakawa,Fazle Hussain +1 more
TL;DR: In this article, the authors describe a quantitative study of the three-dimensional nature of organized motions in a turbulent plane wake and detect coherent structures from the instantaneous, spatially phase-correlated vorticity field using certain criteria based on size, strength and geometry of vortical structures.
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