Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 1997"

TL;DR: In this article, the authors compared LES and RANS calculations of vortex sheddingding flow past a square cylinder at Re = 22.000 and of the 3D flow past the surface-mounted cube at Re < 40.000.

TL;DR: In this paper, an experimental study of vortex-induced vibration of a circular cylinder was conducted in a unique experimental facility especially designed for low mass and low damping, and two separate regions of the high amplitude response curve were identified, which were labeled as upper and lower branches of response.

TL;DR: In this paper, an incompressible SIMPLEC code is used employing non-staggered grid arrangement for the convective terms and time discretization is implicit and a second-order Crank-Nicolson scheme is employed.

TL;DR: In this paper, a fluid mechanicians view of computations of complex 3D flows in wind engineering is presented, in which the large scales of motion are computed explicitly while the small or subgrid-scale motions are modeled.

TL;DR: The paper reviews the current state of the art in computational wind engineering, particularly as it relates to applications of numerical flow modelling for the evaluation of wind effects on buildings and their environment.

TL;DR: In this article, the applicability of the MMK model to flowfields around three types of bluff bodies, i.e., a 2D square rib, a cube and a low-rise building model with 1 : 1 : 0.5 shape, was examined.

TL;DR: The rapid growth of CFD applications to wind engineering is presented and the new trends in turbulence models for applying CWE are noted.

TL;DR: In this article, two-dimensional viscous incompressible flow past bridge girder cross-sections is simulated using the discrete vortex method. But the success of the simulations is attributed to the bluff nature of the cross-section and to the two-dimensions of flow around bridge girders.

TL;DR: In this article, various versions of the k-ϵ model were tested for 3D steady calculations of the flow around a cube placed in developed-channel flow, and the results were compared with the measurements of Martinuzzi and Tropea (1993).

TL;DR: In this paper, the applicability of the Weibull distribution over the complete windspeed range was demonstrated using good quality data, obtained from sonic or lightweight cup anemometers.

TL;DR: In this article, the generated inflow turbulence was modified to satisfy the continuity equation by divergence-free operation based on the method of Shirani et al. and the level of velocity divergence was sufficiently reduced.

TL;DR: In this article, an experimental and numerical investigation on the flow over two-dimensional hilly terrain is presented, where experiments for single hills and continous double hills are performed in a boundary-layer wind tunnel, and mean velocity profiles, turbulence characteristics, and surface pressure distributions are measured.

TL;DR: In this paper, a small rod was set upstream of a square prism to control the flow around a prism, where the side length of the prism, D, was 30 mm and the Reynolds number was Re = 3.2 × 104.

TL;DR: In this article, the mechanism causing energy loss, or damping, in structures is discussed, and measurements from full scale structures are used to demonstrate that the conventionally assumed model for damping is incorrect, and the implications of the assumption of fracture as the dominant mechanism are considered and a generalised nonlinear damping model is considered as a basis for prediction of damping values at the design stage.

TL;DR: In this paper, the authors describe the torsional flutter mechanism of 2D rectangular cylinders and 2D H-shaped cylinders based upon unsteady pressure measurements under forced Torsional vibration.

TL;DR: In this paper, a brief review is presented of the characteristic three-dimensional features found in the wakes of bluff bodies, and the behaviour of the vortex formation length behind a mildly 3D body is discussed.

TL;DR: It is shown that typical numerical solutions obtainable in an industrial context are likely to be strongly dependent not only on the turbulence model but also, and often more importantly, on mesh design and the numerical method.

TL;DR: In this article, a two-dimensional viscous incompressible flow past a flat plate of finite thickness and length is simulated using the discrete vortex method, and the numerical results are compared with the steady-state Blasius solution, and with the inviscid solution for the flow past an oscillating plate by Theodorsen.

TL;DR: In this paper, it was shown that a tethered sphere will oscillate vigorously, at a peak-to-peak amplitude of about two diameters, over a large range of velocities.

TL;DR: In this article, the authors used the CFD-code Fluent® for planning wind tunnel dispersion tests in street canyons, and the results showed that alternative emission conditions and the source design might affect the concentration field within modeled street canyon.

TL;DR: The analysis, modeling and simulation of measured full-scale wind pressure and velocity data is addressed, followed by the simulation of pressure data through new static transformation techniques.

TL;DR: In this article, the authors evaluate the air pollutant distribution around a building by solving the concentration equation based on the previously simulated wind flow field and show the application of the hybrid scheme for the evaluation of pollutant concentration around a rectangular building under conditions of neutral atmospheric stratification.

TL;DR: In this paper, the mean velocity profile given by the Deaves and Harris model for strong winds is compared with the log-law and the power-law models for terrain with roughness changes and is shown to predict accurately the directional exposure characteristics of UK meteorological stations.

TL;DR: In this article, the characteristics of wind and wind-induced vibration of an electrical transmission tower installed on a mountainous area, based on full-scale data obtained at wind speed of less than 25 m/s.

TL;DR: In this paper, the results of CFD analyses of mesoscale climate in the Tokyo area are presented, where the model for geophysical flow problems developed by Mellor and Yamada is used for turbulence closure.

TL;DR: In this article, the eigenvectors and eigenvalues of the covariance matrix were determined for fluctuating wind pressure fields on low-rise building models, and the main conclusions were that the mathematical constraint of orthogonality has a dominant effect on the mode shapes, and association of the modes with physical causes may be fictitious in many cases.

TL;DR: In this paper, a flat plate placed upstream of and parallel to the cylinder has yielded an optimal geometrical configuration consisting of a plate height one-third the cylinder diameter placed 1.5 diameters upstream of the cylinder, and produces a system drag that is 38% that of the bare cylinder alone.

TL;DR: In this article, the wind field in a typhoon boundary layer (TBL) has been investigated by a numerical model, and the results show that vertical profiles of wind speed in the TBL can be satisfactorily stated by conventional power-law expressions.

TL;DR: In this article, the proper orthogonal decomposition (POD) technique is applied to fluctuating wind pressures acting on a tall building model, and the following facts are found: the along-wind and across-wind forces can be approximated by only a few dominant modes, while the torsional moment requires approximately 10 modes.

TL;DR: There has been a strong impetus over the last decade to understand vortex dynamics in wake flows, which are important not only for our understanding of fundamental flow physics, but also for the many applications of bluff body flows in technology.