Showing papers in "Journal of Fluids and Structures in 2009"

TL;DR: In this paper, it was shown how vortex-induced vibration can be practically eliminated by using free-to-rotate, two-dimensional control plates, which achieved VIV suppression with drag reduction.

TL;DR: In this paper, the authors explored the boundaries of what is understood about the vibration behavior of long cylinders excited by vortex shedding and found that peak strain and fatigue damage rates at unexpected locations, the dominance of traveling wave rather than standing wave response, and the appearance of stable cylinder trajectories such as figure eights and crescents in pure traveling wave regions.

TL;DR: In this paper, the dynamic response of a vertical long flexible cylinder vibrating at low mode numbers is presented, where the model had an external diameter of 16 mm and a total length of 1.5 m giving an aspect ratio of about 94, with Reynolds numbers between 1200 and 12 000.

TL;DR: In this article, the authors used Petrov-Galerkin finite element method to solve the Navier-Stokes equations of flow past a stationary circular cylinder at yaw angles (α) in the range of 0-60°.

TL;DR: In this paper, a second-order Navier-Stokes solver is employed coupled with a membrane structural model suitable for the highly nonlinear structural response of the membrane, which results in a delay in stall with enhanced lift for higher angles of attack.

TL;DR: In this paper, the post-divergence behavior of extensible fluid-conveying pipes supported at both ends is studied using the weakly nonlinear equations of motion of Semler, Li and Paidoussis.

TL;DR: In this paper, the authors investigated numerically the hydrodynamic effect of a slit in circular cylinders with the goal of finding a geometric modification that minimizes vortex-induced vibrations without any energy consumption.

TL;DR: In this article, the aerodynamic properties of two-dimensional membrane airfoils were experimentally investigated in a wind tunnel and the effects of the membrane pre-strain and excess length on the unsteady aspects of the fluid-structure interaction were studied.

TL;DR: In this paper, a pair of equal-sized circular cylinders in tandem and staggered arrangements in laminar flow regime is investigated and a stabilized finite element method is utilized to carry out the computations in two dimensions.

TL;DR: In this paper, a two-level (material and geometry) design methodology is proposed, formulated, and implemented to exploit the passive bend-twist coupling effects of self-twisting propellers.

TL;DR: In this paper, a pair of equal-sized circular cylinders of low nondimensional mass (m * = 10 ) in a tandem arrangement were analyzed for flow-induced vibrations in two dimensions, where the structural damping was set to zero for enabling maximum amplitudes of oscillation.

TL;DR: In this article, a new computational model of the linear fluid-structure interaction of a cantilevered flexible plate with an ideal flow in a channel is developed, and the system equation is solved via numerical simulations that capture transients and allow the spatial variation of the flow structure interaction on the plate to be studied.

TL;DR: In this article, the authors make extensive measurements of the fluid forces on a cylinder that is controlled to oscillate transverse to a free stream at Re = 4000, and they find clear discontinuities in the force contours, and they are thus able to identify boundaries separating different fluid forcing regimes.

TL;DR: In this paper, a model with an external diameter of 16 mm and a total length of 1.5 m giving an aspect ratio of about 94 was used to perform more than 100 runs in which Reynolds numbers ranged between 1200 and 12 000.

TL;DR: In this article, the authors present new experimental results of Vortex-Induced Vibration (VIV) on inclined cylinders, mounted on a low damping air-bearing elastic base with one degree of freedom, constrained to oscillate only in the transverse direction to a free stream.

TL;DR: In this paper, the authors investigated the problem of a hinged-splitter plate in the wake of a circular cylinder and found that the splitter plate oscillations increase with Reynolds numbers at low values of Re, and reach a saturation amplitude level at higher Re, Re>4000.

TL;DR: In this paper, the authors considered transverse galloping as a one-degree-of-freedom oscillator subjected to aerodynamic forces, which are described by using the quasi-steady hypothesis.

TL;DR: The possibility of transverse galloping of a square cylinder at low Reynolds numbers (Re ≥200Re≤200, so that the flow is presumably laminar) is analyzed in this article.

TL;DR: In this paper, the effects of base-isolation on the seismic response of cylindrical vertical flexible liquid storage tanks subjected to horizontal seismic ground motion are presented in the time domain.

TL;DR: In this article, the mean and fluctuating forces acting on low aspect-ratio triangular prisms placed vertically on a plane, having isosceles triangular cross-section with 60∘ or 90∘ apex angles and aspect ratios ranging from 1.0 to 3.0, were measured in a wind-tunnel by varying the wind direction, θ, between 0∘ and 180∘, at a Reynolds number Re ≃1.2×105.

TL;DR: Several fluid–structure code-coupling schemes are compared and discussed in terms of stability and energy conservation properties, and recommendations for creating a tool devoted to coupled simulations of fluid structure interactions are given.

TL;DR: In this article, the effect of aerodynamic loading on a single beam is altered when multiple beams are configured in an array, and the degree to which two beams become coupled through the fluid is found to be sensitive to vibration amplitude and proximity of neighboring components in the array.

TL;DR: In this article, a rotating circular cylinder was investigated with particle image velocimetry (PIV) and vortex shedding from the cylinder was clearly observed at α 2.5.

TL;DR: In this paper, the authors used the data from data acquisition devices (typically strain gages and accelerometers) in order to understand the evolution of the riser VIV with the final aim of estimating the fatigue damage.

TL;DR: In this paper, the linear stability of N identical flexible plates with clamped-free boundary conditions forced by a uniform parallel flow was studied, and the effects of the number of plates and their relative distance on the stability property of the state of rest were investigated.

TL;DR: In this article, the stability of the steady, axisymmetric wake of a disk and a sphere as a function of the Reynolds number was investigated, and it was shown that the adjoint global mode reaches a maximum amplitude within the recirculating bubble and downstream of the separation point for both the disk and the sphere.

TL;DR: In this paper, a ship model towed in a towing tank is used to perform pressure and structural measurements at high Reynolds numbers, and the range of validity of some theoretical models for the cross-spectral density representation is analyzed by direct comparison with experimental data of wall-pressure fluctuations measured in streamwise and spanwise direction.

TL;DR: In this paper, the authors investigated the dimensionless pressure amplitude response within a deep cavity, as a function of the streamwise length of the cavity opening; for each length, the pressure response is characterized over a wide range of dimensionless inflow velocity.

TL;DR: In this paper, the authors presented a systematic study on aeroelastic stability of a two-dimensional airfoil with a single or multiple time delays in the feedback control loops.

TL;DR: In this paper, experiments were carried out with air-water and steam-water cross-flow over horizontal tubes, and it was found that fully flexible arrays become unstable at a lower flow velocity when compared to a single flexible tube surrounded by rigid tubes.