Numerical Investigation of Vortex Shedding Past a Finite Circular Cylinder Mounted on a Flat Plate
08 Jun 2011-Numerical Heat Transfer Part A-applications (Taylor & Francis Group)-Vol. 59, Iss: 11, pp 882-909
TL;DR: In this article, a circular cylinder mounted on a flat plate normal to the flow direction is numerically simulated to obtain the detailed spatio-temporal dynamics of wake vortices revealed through the velocity and pressure data.
Abstract: Flow past a circular cylinder mounted on a flat plate normal to the flow direction is numerically simulated. Three-dimensional mass and momentum conservation equations are solved to obtain the detailed spatio-temporal dynamics of wake vortices revealed through the velocity and pressure data. Particular attention is focused on the junction between the flat plate and the cylindrical cross-section, which is well known to be a rich source of three-dimensional vortical structures. The wake–boundary layer interaction region generates necklace vortices, which are popularly known as horseshoe vortices. The effect of spanwise height (H/D) of the cylinder on these vortices and their unsteady wake characteristics are investigated. The forces acting on the cylinder and the Strouhal periodicities are validated for Re = 200, apart from presenting qualitative features, such as streamlines and vorticity contours. The aspect ratio of the cylinder is found to have predominant influence on the primary and secondary vortex s...
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TL;DR: In this article, the thermal-hydraulic characteristics of various circular (plain circular fin, crimped spiral fin, serrated fin) and plate fin [plain plate fin, wavy fin and fin with punched delta winglet pair (DWP)].
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Abstract: Here a comprehensive survey of the literature in the area of numerical heat transfer (NHT) published in 2010 and 2011 has been conducted. Due to the immenseness of the literature volume, journals s...
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TL;DR: In this article, the meshless local Petrov-Galerkin (MLPG) primitive variable based method is extended to analyze the incompressible laminar fluid flow within or over some different two-dimensional geometries.
Abstract: The meshless local Petrov–Galerkin (MLPG) primitive variable based method is extended to analyze the incompressible laminar fluid flow within or over some different two-dimensional geometries. Although still in laminar regions, the Reynolds numbers considered in this study are in the ranges for which, in the literature, the MLPG primitive variable based method has never produced stable solutions and comparable results with those of the conventional methods. The considered test problems include, a steady lid-driven cavity flow with Reynolds numbers up to and including 10,000, a flow over a backward-facing step at 800 Reynolds number, and a transient fluid flow past a circular cylinder with Reynolds numbers up to and including 200. The present method solves the incompressible Navier–Stokes (N–S) equations in terms of the primitive variables using the characteristic-based split (CBS) scheme for discretization. The weighting function in the weak formulation of the governing equations is taken as unity, and the field variables are approximated using the moving least square (MLS) interpolation. For validation purposes, the obtained results are compared with those of the conventional numerical methods. The agreements of the compared results reveal a step forward towards further applications of the MLPG primitive variable based approach.
27 citations
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TL;DR: In this paper, an unsteady two-dimensional numerical simulation is performed to investigate the laminar forced convection heat transfer for flow past a semicircular cylinder in an unconfined medium.
Abstract: An unsteady two-dimensional numerical simulation is performed to investigate the laminar forced convection heat transfer for flow past a semicircular cylinder in an unconfined medium. The Reynolds number considered in this study ranges from 50 to 150 with a fixed Prandtl number (Pr = 0.71). Two different configurations of the semicircular cylinder are considered; one when the curved surface facing the flow and the other when the flat surface facing the flow. Fictitious confining boundaries are chosen on the lateral sides of the computational domain that makes the blockage ratio B = 5% in order to make the problem computationally feasible. A finite volume-based technique is used for the numerical computation. The flow and heat transfer characteristics are analyzed with the streamline and isotherm patterns at various Reynolds numbers. The dimensionless frequency of vortex shedding (Strouhal number), drag coefficient, and Nusselt numbers are presented and discussed. Substantial differences in the global flow...
22 citations
References
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"Numerical Investigation of Vortex S..." refers background or result in this paper
...In this context, Sumer and Fredsøe [46] have identified the occurrence of the following changes in fluid flow features....
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TL;DR: The vorticity-stream function formulation of the two-dimensional incompressible NavierStokes equations is used to study the effectiveness of the coupled strongly implicit multigrid (CSI-MG) method in the determination of high-Re fine-mesh flow solutions.
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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.
Abstract: Since the review of periodic flow phenomena by Berger & Wille (1972) in this journal, over twenty years ago, there has been a surge of activity regarding bluff body wakes. Many of the questions regarding wake vortex dynamics from the earlier review have now been answered in the literature, and perhaps an essential key to our new understandings (and indeed to new questions) has been the recent focus, over the past eight years, on the three-dimensional aspects of nominally two-dimensional wake flows. New techniques in experiment, using laser-induced fluorescence and PIV (Particle-Image-Velocimetry), are vigorously being applied to wakes, but interestingly, several of the new discoveries have come from careful use of classical methods. There is no question that strides forward in understanding of the wake problem are being made possible by ongoing three- dimensional direct numerical simulations, as well as by the surprisingly successful use of analytical modeling in these flows, and by secondary stability analyses. These new developments, and the discoveries of several new phenomena in wakes, are presented in this review.
3,206 citations
"Numerical Investigation of Vortex S..." refers background in this paper
...Williamson [15] provides a comprehensive review on the dynamics of wake vortices past a circular cylinder....
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