Journal ArticleDOI
Effect of Axis Ratio on Fluid Flow Around an Elliptic Cylinder—A Numerical Study
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TLDR
In this paper, a detailed study about fluid flow characteristics over an elliptic cylinder placed in a free stream is performed and the influence of the axis ratio (AR) on wake length and wake formation is analyzed.Abstract:
The bluff body simulations over canonical forms like circular and square cylinders are very well studied and the correlations for bulk parameters like mean drag coefficient and Strouhal numbers for the same are reported widely. In the case of elliptic cylinder, the literature is very sparse, especially for moderate Reynolds number (Re). Hence, in this work, a detailed study about fluid flow characteristics over an elliptic cylinder placed in a free stream is performed. Simulations are carried out for different Re ranging from 50 to 500 with axis ratio (AR) varied between 0.1 to 1.0 in steps of 0.1. Immersed boundary method is used for the solid boundary condition implementation which avoids the grid generation for each AR and a single Cartesian grid is used for all the simulations. The effect of AR for various Reynolds numbers is also focused on using the in-house code. The influence of AR is phenomenal for all the Re and the values of wake length, drag coefficient, and Strouhal number decrease with decreasing AR for a particular Re. The critical ARs, for vortex shedding and wake formation, are identified for various Re. Detailed correlations for wake length, critical ARs for vortex shedding and wake formation, mean drag coefficient and Strouhal number, in terms of AR, are reported in this work. [DOI: 10.1115/1.4024862]read more
Citations
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Journal ArticleDOI
Onset of laminar separation and vortex shedding in flow past unconfined elliptic cylinders
TL;DR: In this article, numerical studies on predicting onset of flow separation and vortex shedding in flow past unconfined two-dimensional elliptical cylinders for various Axis Ratios (AR) and a wide range of Angles of Attack (AOA).
Journal ArticleDOI
Wake dynamics behind a seal-vibrissa-shaped cylinder: a comparative study by time-resolved particle velocimetry measurements
Shaofei Wang,Yingzheng Liu +1 more
TL;DR: In this article, the wake dynamics behind a seal-vibrissa-shaped cylinder, which are closely related to the seal's extraordinary ability to faithfully track the hydrodynamic trails of its upstream prey, were extensively studied by using time-resolved particle image velocity.
Journal ArticleDOI
Numerical analysis of laminar fluid flow characteristics past an elliptic cylinder: A parametric study
TL;DR: In this paper, the effects of Angle of Attack (AOA), Axis Ratio (AR) and Reynolds number (Re) on unsteady laminar flow over a stationary elliptic cylinder are studied numerically on a Cartesian grid using Projection method based Immersed Boundary technique.
Journal ArticleDOI
Numerical study of fluid flow past a rotating elliptic cylinder
TL;DR: Numerical solutions for fluid flow past a rotating elliptic cylinder for different non-dimensional rotational rates (05, 10 and 15) and various axis ratios (01, 03, 05, 07 and 10) were presented in this article.
Journal ArticleDOI
Analysis and characterisation of momentum and thermal wakes of elliptic cylinders
TL;DR: In this paper, the authors derived a heat transport model based on the vortex dynamics for two-dimensional elliptic cylinders by considering vorticity is acted by flow, which has shear and swirl.
References
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Journal ArticleDOI
Vortex Dynamics in the Cylinder Wake
TL;DR: A review of wake vortex dynamics can be found in this article, with a focus on the three-dimensional aspects of nominally two-dimensional wake flows, as well as the discovery of several new phenomena in wakes.
Journal ArticleDOI
Immersed boundary methods
Rajat Mittal,Gianluca Iaccarino +1 more
TL;DR: The term immersed boundary (IB) method is used to encompass all such methods that simulate viscous flows with immersed (or embedded) boundaries on grids that do not conform to the shape of these boundaries.
Journal ArticleDOI
An immersed-boundary finite-volume method for simulations of flow in complex geometries
TL;DR: In this paper, a new immersed-boundary method for simulating flows over or inside complex geometries is developed by introducing a mass source/sink as well as a momentum forcing.
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Experiments on the flow past a circular cylinder at low Reynolds numbers
TL;DR: In this article, the authors describe measurements of the drag on circular cylinders, made by observing the bending of quartz fibres, in a stream with the Reynolds number range 0·5-100.
Journal ArticleDOI
Strouhal numbers of rectangular cylinders
TL;DR: In this article, experiments on the vortex shedding frequencies of various rectangular cylinders were conducted in a wind tunnel and in a water tank and the results show how Strouhal number varies with a width-to-height ratio of the cylinders in the range of Reynolds number between 70 and 2 × l04.