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Showing 1 to 20 of 157 for “"Vortex Shedding"”.
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Computational modelling of vortex shedding flows
… of a two--<:limensional CFD method for vortex shedding flows past square and circular cylinders. The overall approach can be regarded as a compromise between the accuracy and computational costs, especially for high-Reynolds number flows. The latter are modelled by variants of the k - E …
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Stability and Vortex Shedding of Bluff Body Arrays
… Particular attention was focused on the vortex shedding which was visualized and quantified through computation of the flow swirl, a quantity which identifies regions of rotary motion. The conditions required for the generation of leading edge vortex shedding were identified and …
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Analysis of vortex shedding in a various body shapes
… shape of bluff body that can be used for vortex flow meter applications. Numerical simulations of bluff body shapes such as circular, rectangular and equilateral triangular have been carried out to understand the phenomenon of vortex shedding. The simulation applied
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Response of structural members to wind-induced vortex shedding
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1991.
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Serviceability-based design of tall buildings subjected to vortex shedding
… across wind response caused mainly due to vortex shedding becomes a very important phenomenon that needs to be dealt with, and which also contributes a significant amount of acceleration on the building. Acceleration due to vortex shedding is the focus of this thesis. To determine a …
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Closed-loop control of vortex shedding by means of Lorentz force
… fluid flows past a circular cylinder, vortex shedding occurs as soon as the Reynolds number exceeds about 40. Vortex shedding is usually undesirable, as it generates a significant increase in drag, as well an oscillating lift force on the cylinder leading to cross-stream structural …
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Study of Three-Dimensional Vortex Shedding in the Wake of a Square Cylinder
… intermediate wavenumber disturbance which has a shedding frequency twice that of the base flow. This intermediate wavelength mode has not been observed in analysis of the circular cylinder. The presence of this new intermediate wavelength mode may explain the complicated behavior observed in …
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Hydrodynamic performance and vortex shedding of a biologically inspired three-dimensional flapping foil
The dynamics of flapping remains a subject a great theoretical and practical interest. Propulsion and maneuvering by flapping, optimized through years of evolution, is ubiquitous in nature, yet marine pulsars inspired by examples of highly maneuverable marine life or aquatic birds remain unheard …
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Parallel Simulations, Reduced-Order Modeling, and Feedback Control of Vortex Shedding using Fluidic Actuators
… circular cylinder, we examine the phenomenon of vortex shedding observed in many bluff body wakes. We develop a parallel computational fluid dynamics (CFD) code to solve the incompressible Navier-Stokes equations on curvilinear coordinates to analyze vortex shedding. The algorithm is implemented …
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Vortex shedding from a vibrating cable with attached spherical bodies in a linear shear flow
… oscillation of these cables, caused by vortex shedding, is extremely undesirable because of the associated damaging phenomena. The present study, which employs hot wire anemometry as the principal investigative tool, was undertaken to examine the behavior in the near wake of a flexible, …
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Lagrangian Visualization and Real-Time Identification of the Vortex Shedding Time in the Wake of a Circular Cylinder
… identifying the locations of vortices and their shedding time could increase the effectiveness of the control techniques. In the current work, two-dimensional, two-component velocity data was collected in the wake of a circular cylinder using a planar digital particle image velocimetry (DPIV) …
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Trailing Edge Aerodynamics: Flow Regimes, Geometry and Loss
… can shed vortices in a manner known as transonic vortex shedding, where vortices form very close to the trailing edge and cause large trailing edge shear layer deflection. This, in turn, results in shockwaves that can propagate upstream of the trailing edge. When this flow regime occurs, it is …
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A Comprehensive Three-Dimensional Analysis of the Wake Dynamics in Complex Turning Vanes
… thicknesses. This, in turn, introduces periodic vortex structures in the wake, commonly known as trailing edge vortex shedding. To fully understand how the dynamics and coherent wake formations within vortex shedding impact both the flow distortion and structural durability of StreamVanes, it is …
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Experimental investigation of inclined cantilever beams in vertically falling soap films
… soap film experiment to visualize the wake and vortex shedding flow characteristics. High speed video and image analysis were used to estimate quantities such as the average displacement, vibration amplitude and frequency for the cantilevers. From the analysis we find the steady displacement …
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Characterization, modeling and mitigation of vortex-induced vibration of slender cylinders
… at large amplitudes under wind excitation. Vortex-shedding was found to be one of the primary excitation mechanisms which manifests itself as distinct characteristics of the resultant problematic vibrations. The objectives of the proposed research are to formulate a methodology for …
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Experimental investigation of an aspirated fan stage
… a large blade to blade variation due to unsteady vortex shedding, which is not captured by conventional 3-D, viscous analysis tools. An incompressible, vortex shedding model calibrated to the experimental data shows that the vortex shedding induces radial flows that redistribute flow properties in …
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Heat and Mass Transfer Performance and Flow Characteristics of an Offset -Strip Array at Reynolds Numbers Up to 100,000
… the flow in the offset-strip fin array exhibits vortex shedding at two frequencies, depending on the location from which the vortices are being shed. The associated Strouhal numbers are approximately 0.15 and 0.20. The PIV experiments reveal the flow to be in a turbulent, vortex shedding regime. …
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Dynamics and stability of flow past a circular cylinder in ground effect
… on the cessation of large-scale, von Karman-type vortex shedding in 'ground effect', i.e., the cessation observed when the cylinder comes close to the ground. The experiments, performed at upper-subcritical Reynolds numbers of 0.4 and 1.0 x 105, show that the cessation of von Karman-type vortex …
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