Showing papers in "Journal of Fluids and Structures in 1993"

TL;DR: In this paper, it was shown that a stable coexistence of the jet profile and the large-scale patterns is ensured only at the frequency of maximum amplification, hence at this frequency optimal efficiency is obtained, i.e., maximum thrust per unit input energy.

TL;DR: In this article, a review of the dynamics of pipes conveying fluid is presented, with a focus on the nonlinear and chaotic dynamics of pipe conveying systems, and a selective review of recent work on this problem is presented.

TL;DR: In this article, case studies drawn from 17 years of field laboratory experiments are used to demonstrate and explain why the flow-induced vibration of long cylinders in ocean currents varies from single mode lock-in to broad band random vibration.

TL;DR: In this article, the effects of variation of Reynolds number, aspect ratio, turbulence of the incident flow and wind tunnel blockage on an elemental slice of a circular cylinder were investigated.

TL;DR: In this article, a wide range of cross-sectional shapes and angles of incidence of prismatic bodies and grids composed of prisms are reviewed for vortex-induced transverse, torsional, streamwise, and plunging vibrations.

TL;DR: In this article, an in-line tube bundle with large spacing ratios is tested in air and water flows to examine the mechanisms of vorticity shedding and acoustic resonance, including correlation measurements of the velocity fluctuations, and visualization of the flow structure at resonant and non-resonant conditions.

TL;DR: In this article, the mean loading of smooth, cantilevered circular cylinders immersed in a low-turbulence uniform flow was investigated in a wind tunnel at a Reynolds number of 4.4 x 104 for aspect ratios in the range 4 to 30.

TL;DR: In this article, a modification to the Marker-and-Cell technique, with special attention to boundary conditions and maintaining the mass conservation of the flow through a correction for the liquid height, is adopted as a method of numerical solution.

TL;DR: In this paper, a linear axisymmetric free vibration analysis of the bottom plate of a cylindrical tank coupled with liquid is presented, where the effect of an in-plane force in the plate due to the static liquid pressure is taken into account.

TL;DR: In this paper, an eigenfunction expansion complete to second-order is presented for the two-dimensional wave motion forced by a sinusoidally moving generic wavemaker, and a time-dependent secondorder evanescent interaction potential and time-independent potential required to satisfy boundary conditions exactly are examined in detail.

TL;DR: In this article, a fundamental study of vortex shedding in rotated square tube arrays over a range of pitch ratios from 1·21 to 2·83 was carried out in a wind tunnel with hot-wire measurements providing details for velocity distribution and flow periodicity.

TL;DR: In this article, an unsteady theoretical model for fluidelastic instability in an array of tubes in cross-flow is presented, based on concepts developed by Lever and Weaver, but is extended to overcome some of the problems encountered with that earlier work.

TL;DR: In this article, the nonlinear planar dynamics of a vertical cantilevered pipe conveying fluid are explored, in the presence of an intermediate spring support, by means of a two-degree-of-freedom Galerkin discretization of the flexible system.

TL;DR: In this article, the authors investigated the fluctuating pressures and loads induced on smooth, cantilevered circular cylinders immersed in a low-turbulence, uniform flow in a wind tunnel at a Reynolds number of 4·4 × 104 for aspect ratios in the range 4 to 25.

TL;DR: In this article, a semi-empirical mathematical model based on the Hartlen-Currie model of vortex-induced vibration and the quasi-steady model of Parkinson and Smith has been shown to be in good agreement with experimental observations under 2D nonresonant and subharmonically resonant conditions.

TL;DR: In this paper, the authors investigated the fluctuating loads induced on a smooth, cantilevered circular cylinder with an aspect ratio of 30 immersed in a low-turbulence uniform flow.

TL;DR: In this paper, a series of experiments has been conducted on a square in-line tube array subjected to water cross-flow, and the results of these analyses are compared to previously published results and to theoretical modal parameter variations with flow velocity, obtained with a slightly extended version of the Lever-Weaver analytical model.

TL;DR: A relatively simple unsteady theory of fluidelastic instability in a flexible array of tubes in cross-flow was developed in Part 1 of this study as discussed by the authors. But this theory is not suitable for a single flexible tube at high values of the mass-damping parameter.

TL;DR: In this article, a semi-empirical model is described for predicting unsteady aerodynamic forces on arbitrary airfoils under mildly stalled and unstalled conditions, using second order ordinary differential equations for lift and moment with airfoil motion as the input.

TL;DR: In this article, a trapezoidal cross-section cylinder with a splitter plate whose length is twice the maximum width of the cylinder was used to suppress low-frequency variations embedded in the vortex shedding process.

TL;DR: In this article, the interaction of the free liquid surface in a cylindrical container with a flexible tank bottom has been investigated, and it was found that a more flexible container bottom changes the coupled liquid frequencies, a fact which is pronounced for small liquid heights.

TL;DR: In this article, the authors used a system of patched grids for a rotor-stator configuration of an axial turbine to solve the Navier-Stokes equations of axial turbines.

TL;DR: In this article, an experimental study on the stability of a cantilevered cylindrical flexible (silicone rubber) shell, concentrically located within a rigid cylinder and subjected to air flow in either the annular region or inside the shell, is presented.

TL;DR: In this article, the instantaneous drag and lift force on an individual bed element forming part of a closely packed cover layer and the flow velocities above it were measured in an open channel with a backward-facing step.

TL;DR: In this article, the periodic velocity field in the region of the cavity opening has been measured for various flow conditions and the vorticity distribution has been computed from the measured data using numerical differentiation.

TL;DR: In this article, the dynamics of a rotatable cylinder-splitter-plate body submerged in a uniform flow was studied, with emphasis on fluid-structure interaction, using a finite-difference method on a numerically generated, boundary-fitted, moving curvilinear coordinate system.

TL;DR: In this paper, a study of the dynamical behaviour and stability of a cylindrical shell containing and/or immersed in an axially flowing inviscid and incompressible fluid is presented.

TL;DR: In this article, a semi-empirical model is constructed of the wavevector-frequency spectral density of streamwise turbulent wall-shear stress, which is influenced also by the relationship of the shear-stress spectrum to those of fluctuating Reynolds-stress "sources".

TL;DR: In this article, an asymptotic theoretical analysis of the effect of perforated shrouds on the loading on the inner cylinder is presented, where the shroud openings are assumed to be infinitely small and potential theory is assumed to hold in the fluid domains on either side of the shroud.

TL;DR: In this article, an optimization study applied to rectangular liquid tankers, subjected to some road manoeuvers, is presented and discussed, where the optimal geometrical shape, given by the height/width ratio of a container, is computed based on the nonlinear static analysis of the liquid loading arising during such manoeurvers of the vehicle as steady cornering, lane change, or evading of an obstacle.