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A Numerical Investigation Of The Near Wake Structure In The Variable Frequency Forced Oscillation Of A Circular Cylinder
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Book Synopsis A Numerical Investigation of the Near Wake Structure in the Variable Frequency Forced Oscillation of a Circular Cylinder by : Vijayendra K. Rao
Download or read book A Numerical Investigation of the Near Wake Structure in the Variable Frequency Forced Oscillation of a Circular Cylinder written by Vijayendra K. Rao and published by . This book was released on 2005 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical Investigation of the Near Wake Structure in the Forced Oscillation of a Circular Cylinder by : Sampath K. Atluri
Download or read book A Numerical Investigation of the Near Wake Structure in the Forced Oscillation of a Circular Cylinder written by Sampath K. Atluri and published by . This book was released on 2004 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluid Mechanics and Fluid Power (Vol. 2) by : Suvanjan Bhattacharyya
Download or read book Fluid Mechanics and Fluid Power (Vol. 2) written by Suvanjan Bhattacharyya and published by Springer Nature. This book was released on 2023-05-20 with total page 541 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the select proceedings of the 48th National Conference on Fluid Mechanics and Fluid Power (FMFP 2021) held at BITS Pilani in December 2021. It covers the topics such as fluid mechanics, measurement techniques in fluid flows, computational fluid dynamics, instability, transition and turbulence, fluid‐structure interaction, multiphase flows, micro- and nanoscale transport, bio-fluid mechanics, aerodynamics, turbomachinery, propulsion and power. The book will be useful for researchers and professionals interested in the broad field of mechanics.
Book Synopsis A Study of the Near-wake Structure from a Circular Cylinder by : Chao-Kun Chyu
Download or read book A Study of the Near-wake Structure from a Circular Cylinder written by Chao-Kun Chyu and published by . This book was released on 1995 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex-induced Vibration and Forced Oscillation Motion of a Circular Cylinder Fitted with a Single Spanwise Tripwire by : Ehsan Vaziri
Download or read book Vortex-induced Vibration and Forced Oscillation Motion of a Circular Cylinder Fitted with a Single Spanwise Tripwire written by Ehsan Vaziri and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experimental study consisted of two main parts. The first part investigated the control induced by a spanwise tripwire on a circular cylinder undergoing one-degree-of-freedom vortex-induced vibration (VIV). The cylinder vibrates in the cross-stream direction as a result of the fluid forcing in a recirculating water tunnel. Changing mass and damping ratios in the test rig allowed the investigation at different VIV response branches. The tripwire diameter was 6.25% of the cylinder diameter. Experimental research was conducted by attaching the large-scale tripwire along the span of the cylinder at various angular positions ranging from 0° to 180° (with respect to the most upstream point of the cylinder). Along with measuring the trajectory of the cylinder motion, the instantaneous velocity field in the near wake of the cylinder was obtained simultaneously at a fixed Reynolds number of 10,000 (based on the cylinder diameter) using a Particle Image Velocimetry (PIV) system. Various vortex-formation modes induced by the tripwire were observed. It was shown that the oscillation pattern, frequency, and amplitude of the cylinder can be altered significantly depending on the angular position of the tripwire and the VIV response branch. For specific tripwire positions, increases of up to 52 times and decreases of up to 98% were identified in the oscillation amplitude of the tripped cylinder compared to the amplitude of the clean cylinder.The second part of the study investigated the effects of the tripwire on the flow structure behind a circular cylinder forced to oscillate harmonically at prescribed amplitudes and frequencies in the cross-stream direction. Oscillation amplitudes are 0.05, 0.3 and 0.6 times the cylinder diameter, and oscillation frequencies are 0.61, 0.8, and 1 times the vortex shedding frequency of the stationary clean cylinder counterpart. For a fixed oscillation amplitude and frequency, the tripwire can either induce intermittent switching between various vortex shedding modes or cause a wake mode to be dominant during the entire observed oscillation motion by altering the vortex shedding mechanism. The wake of the tripped cylinder undergoing the lowest amplitude forced oscillation motion showed resemblance to the wake of the stationary tripped cylinder.
Book Synopsis An Experimental Investigation of the Near Wake of a Circular Cylinder by : Ronald E. Walterick (CIVILIAN.)
Download or read book An Experimental Investigation of the Near Wake of a Circular Cylinder written by Ronald E. Walterick (CIVILIAN.) and published by . This book was released on 1980 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Near Wake of a Circular Cylinder by : Ronald Eugene Walterick
Download or read book An Experimental Investigation of the Near Wake of a Circular Cylinder written by Ronald Eugene Walterick and published by . This book was released on 1980 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near field region of the turbulent wake behind a rotating and nonrotating two dimensional circular cylinder is documented. U component mean velocities, turbulent intensities and velocity autocorrelation functions are measured at various downstream locations. From the autocorrelation functions, Taylor time microscales, longitudinal integral time scales and energy dissipation rates are computed. The measurements are performed for the flow over a circular cylinder at omega = 0 RPM and omega is approximately 500 RPM. The free stream velocity and Reynolds number, based on cylinder diameter, are respectively 5.9 m/sec and approximately 50,000. The turbulent measurements are made with a laser velocimeter using a frequency shifting phase modulator and the photon correlation processing scheme. Naturally occurring contaminant is augmented with vaporized kerosene to increase the magnitude of scattered light. Results are presented for the effects of varying omega, frequency shifting, particle concentrations and detector optics pinhole size on the turbulent quantities. (Author).
Book Synopsis An Investigation of the Wake from a Circular Cylinder Undergoing Rotational Oscillations by : Craig W. Schmidt
Download or read book An Investigation of the Wake from a Circular Cylinder Undergoing Rotational Oscillations written by Craig W. Schmidt and published by . This book was released on 2003 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A numerical investigation of the effects of the spanwise length on the three-dimensional wake of a circular cylinder by : David François Lionel Labbé
Download or read book A numerical investigation of the effects of the spanwise length on the three-dimensional wake of a circular cylinder written by David François Lionel Labbé and published by . This book was released on 2004 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Critical Review of the Intrinsic Nature of Vortex Induced Vibrations by : Turgut Sarpkaya
Download or read book A Critical Review of the Intrinsic Nature of Vortex Induced Vibrations written by Turgut Sarpkaya and published by . This book was released on 2003 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.
Book Synopsis Wake Dynamics in Flow Past an Oscillating Cylinder by : Hugh M. Blackburn
Download or read book Wake Dynamics in Flow Past an Oscillating Cylinder written by Hugh M. Blackburn and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of coupling between the flow in the wake of a circular cylinder and cylinder motion has important applications in structural, offshore and thermal power engineering. For lightly-damped structural elements, comparatively large-amplitude cylinder oscillations (order of two diameters peak-to-peak;) may result when the frequency of vortex shedding coalesces with one of the natural frequencies of the structure. This in turn can lead to a large reduction in the fatigue life of the structure or alternatively produce motion-related serviceability problems. A significant feature of the cylinder-wake interaction appears to be the presence of vortex couples in the near wake, of either skew- symmetric or asymmetric nature [1]. In order to examine the physics of the problem, we have taken a direct numerical simulation approach, in which the Navier-Stokes equations are solved in an accelerating reference frame attached to the cylinder [3]. Spatial discretization has been carried out using a non-conforming spectral element method [4,6]; time advancement was carried out using a second order time-splitting scheme [7]. As an adjunct to future studies in vortex-induced vibration, timeseries of lift and drag coefficients are presented, based on two-dimensional studies of forced cross-flow oscillation at Re-500. These are complemented by an examination of wake modes, using contours of vorticity. We use correlations between lift forces and cylinder cross-flow velocities and acceleration to assess the phase angle between lift force and cylinder motion, which in turn indicates the sign of mechanical power transfer between the fluid and the cylinder.
Book Synopsis An Experimental Investigation of the Near Wake of a Circular Cylinder in the Subcritical Regime by : Richard Walter Wlezien
Download or read book An Experimental Investigation of the Near Wake of a Circular Cylinder in the Subcritical Regime written by Richard Walter Wlezien and published by . This book was released on 1976 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: The near wake of a circular cylinder in crossflow is experimentally investigated for Reynolds number 7600. The purpose is to develop techniques for characterizing the formation region of the Karman vortex street in presence of transition to turbulence and to use these techniques to examine the quasi-periodic vortex shedding phenomenon. A thermal tracer is used to tag vortical fluid in one of the cylinder boundary layers and this scalar is subsequently detected in the wake. The instantaneous phase of the amplitude and frequency modulated poly-chromatic vortex shedding phenomenon is computed using a digital Hilbert transform technique. This method is a generalization of the monochromatic complex rotating vector to processes which are modulated. The computed phase is used to conditionally sample the wake temperature using a six-sensor resistance thermo-meter array, and the resulting data are processed using statistical methods. Results demonstrate that the near wake region contains diffuse vortical fluid and this fluid has a role in the shar layer instability. The statistics also show the formation and shedding of a mean Karman vortex, and lead to a possible explanation of the modulation process. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 1999 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transverse Oscillations of a Circular Cylinder in Uniform Flow, Part 1. Revised by :
Download or read book Transverse Oscillations of a Circular Cylinder in Uniform Flow, Part 1. Revised written by and published by . This book was released on 1977 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of an experimental and analytical investigation of the forced oscillations of a circular cylinder in uniform flow. The transverse force has been decomposed into two components and the appropriate force coefficients have been determined experimentally through the use of a Fourier-averaging technique. The results were then incorporated into the equation of motion to predict the dynamic response of elastically-mounted cylinders. The numerical predictions were found to be in good agreement with those obtained experimentally. The results of the discrete-vortex model of the separated flow field about an oscillating cylinder will be described in a separate report.
Book Synopsis Spanwise Wake Structures of a Circular Cylinder and Two Circular Cylinders in Tandem by : J. Wu
Download or read book Spanwise Wake Structures of a Circular Cylinder and Two Circular Cylinders in Tandem written by J. Wu and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure of wakes downstream of cylinders is of major importance in the generation of flow-induced sound and vibration and also influences the convective heat transfer process. In particular, it is now thought that the formation of spanwise structures plays an important role. A better understanding of their development is required, and this could lead to ways of reducing both noise and vibration and to an improvement in heat and momentum transfer. Data are presented from tests carried out in a closed-circuit wind tunnel; also presented are data and flow visualizations from tests in a closed-circuit water tunnel. Hot-wire anemometer probes and pressure probes were used to measure velocity and pressure fluctuations at a number of spanwise locations in the wakes. From these measurements the spanwise coherence was calculated. The spanwise coherence increased as the distance between the cylinders in tandem was decreased; when this distance was less than three diameters, spanwise coherence at all spanwise separations was higher than for a single cylinder. Flow visualizations show the complex nature of the flow in the spanwise direction, particularly the existence of streamwise vortices. These appear to be responsible for the sharp reduction in spanwise coherence at large separations between the two cylinders in tandem. The work described is from a preliminary study with the object of developing a better understanding of near-wake flows prior to undertaking a comprehensive three-dimensional flow-field investigation.
