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Sunday, July 26, 2020 | History

1 edition of Transverse oscillations of a cylinder in uniform flow found in the catalog.

Transverse oscillations of a cylinder in uniform flow

by Paulo Arruda Raposo

  • 355 Want to read
  • 11 Currently reading

Published by Naval Postgraduate School in Monterey, California .
Written in English

    Subjects:
  • Mechanical engineering

  • ID Numbers
    Open LibraryOL25411618M

    Superposition of a Uniform Flow, a Doublet and a Vortex Click to view movie (38k) Streamlines of Flow Past a Rotating Cylinder where (a) Γ / (4 π aU) 1 When the solutions obtained previously for flow past a fixed cylinder are combined with a vortex, flow past a rotating cylinder can be simulated. The streams in this test were uniform flow, ranging from m/s to m/s with the interval of m/s. and while the ratio of in-line and transverse cylinder oscillation amplitudes is.

    At Re = , the predicted flow field around a circular cylinder in forced transverse oscillation is verified with experimental results. For coupled torsional and transverse oscillation cases, the numerical results indicate that lock-in depends on the relative phase between torsional and translational oscillations. A literature survey reveals there are no papers studying the case of vortex-induced vibrations in which a circular cylinder moves with combined transverse and rotational oscillations in a uniform flow. Keywords. computation, unsteady, incompressible, viscous, translational and rotational oscillations, cylinder.

    In , Hartlen and Currie published a theory which described the transverse oscillations of a circular cylinder in a normal steady wind. This theory is used here to successfully describe the longitudinal oscillations of a rectangular cylinder with a side length ratio of 10 and standing at an angle of attack of 30% to the oncoming flow of water. Wu, W., Bernitsas, M. M. & Maki, K. RANS simulation versus experiments of flow induced motion of circular cylinder with passive turbulence control at 35


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Transverse oscillations of a cylinder in uniform flow by Paulo Arruda Raposo Download PDF EPUB FB2

texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK Transverse oscillations of a circular cylinder in uniform flow. Item Preview remove-circle Transverse oscillations of a circular cylinder in uniform flow.

by Meyers, David W. Publication date Topics Mechanical engineeringPages:   A circular cylinder, mounted vertically, was given forced sinusoidal oscillations in the transverse direction to a uniform flow stream of water produced in a water tank facility.

For large cylinder amplitudes used in the present study, we used a cylinder of a smaller diameter at D = by: 2. To the author’s knowledge, no experiment or numerical work has been attempted for studying the development of initial flow generated by combined streamwise and transverse oscillations of a cylinder in a uniform flow.

This paper is organized as follows. In Section 2, we present the governing equations for the physical by: Numerical investigations have been carried out for the flow-induced transverse vibration of an elastically mounted elliptical cylinder with a variable aspect ratio.

The cylinder has the major (minor) axis perpendicular to (aligned with) the uniform flow. The Reynolds number, based on the free stream velocity and the major axis width, is fixed.

Monterey,California SSS-1 TRANSVERSEOSCILLATIONSOFACIRCULAR CYLINDERINUNIFORMFLOW by DavidWilliamMeyers December ThesisAdviso: ya Eji/jgagwu—t— ar. The P+S mode occurs when the cylinder moving speeds are, for most of the time, higher than the speed of the uniform flow.

These situations are found at fast and large-amplitude cylinder oscillations in which the flow relative to the cylinder movement takes over the uniform flow in governing the initial vortex formation. Flow visualization studies of the wake show that the primary lock-on characteristics for transverse oscillation are reproduced in rotational oscillation.

The results confirm the claim by many researchers that the transverse oscillation of a cylinder, in a uniform flow over the primary lock-on, is analogous to a cylinder with rotational.

Flow-induced vibration (FIV) of a D-section cylinder is computationally studied and utilized to augment convective heat transfer in a heated laminar channel flow.

An in-house fluid–structure intera. Limited study has also been made for two other Reynolds numbers, namely, and The objective of the present study is to modify the near-wake flow structure using actuation of the cylinder for possible reduction in drag force.

Transverse oscillations to the cylinder are. Forces are measured at both ends of rigid cylinders with span 60 cm, performing transverse oscillations within an oncoming stream of water, at Reynolds number Re ≈ Forced harmonic motions and free vibrations of uniform and tapered cylinders are studied.

A brief review of damping is followed by a comparison of three sets of lift-force data for circular cylinders, subjected only to transverse oscillation. Then the significance of two-dimensional or biharmonic oscillations (in both the in-line and transverse directions) is discussed in light of experiments undertaken for that purpose, to simulate.

This study explores the vortex patterns formed by a circular cylinder undergoing lateral cylinder oscillations with large amplitudes and in the presence of a slow uniform cross flow. It is an extension of our previous study (Lam et al., b) in which formation of the 2S, 2P and P+S vortex modes were discussed from the viewpoint of interaction of a uniform cross-flow with the vortex street.

Over a range of this parameter, the response exhibits oscillations at amplitudes up to 06 and frequencies between 015 and 02.

From this response function, the classic response in terms of reduced velocity can be obtained for fixed values of the cylinder/fluid ratio m *. It displays “lock-in” at very high values of m *. JliCUWlTvCLASSIFICATIONOFTHIS"lOEi'^inD»r»End Ithasfurtherbeenshownthattheheuristicmodelspreviouslyusedare inadequatetocorrectlypredictthe in.

In this paper streamwise and transverse oscillations of a rigid circular cylinder in a rectangular channel are investigated using the Virtual Boundary method.

Numerical study of the three-dimensional flow around the cylinder is done for the uniform Cartesian grid. All computations are performed at Reynolds numbers of Re= and based on the mean flow velocity.

Forces are measured at both ends of rigid cylinders with span 60 cm, performing transverse oscillations within an oncoming stream of water, at Reynolds number Re ~ Forced harmonic motions and free vibrations of uniform and tapered cylinders are studied.

Open-jet wind tunnel experiments were performed to study vortex shedding from a cylinder vibrating in line with an incident steady flow. Experiments were conducted at a Reynolds number of and the shedding was synchronized with the vibrations of the cylinder which were at frequencies nearly twice the Strouhal shedding frequency for a stationary cylinder.

Transverse surface waves in steady uniform and non-uniform flows through an array of emergent and slightly submerged square cylinders. Journal of.

A finite difference simulation method for the time dependent viscous incompressible flow around a transversely and longitudinally oscillating circular cylinder at Reynolds numbers of Re=4×10 3 and 4×10 4 is presented.

The Navier-Stokes equations in finite difference form are solved on a moving grid system, based on a time dependent coordinate transformation. In mathematics, potential flow around a circular cylinder is a classical solution for the flow of an inviscid, incompressible fluid around a cylinder that is transverse to the flow.

Far from the cylinder, the flow is unidirectional and uniform. The flow has no vorticity and thus the velocity field is irrotational and can be modeled as a potential flow.

This article presents experimental results concerning the transverse flow-induced oscillations of a square-section cylinder for several values of the mass ratio, ranging from toand low.transverse oscillations within an oncoming stream of water, at Reynolds number Reˇ Forced harmonic motions and free vibrations of uniform and tapered cylinders are studied.

To study free motions, a novel force-feedback control system has been developed, consisting of: (a) a force transducer, which measures forces on.Fluid Forces on Oscillating Cylinders. The paper 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-transfer coefficients have been determined experimentally through the use of a Fourier averaging techinique.