Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 1981"

TL;DR: A wide variety of aerodynamic and hydrodynamic means for suppressing vortex shedding is classified into three categories in accordance with the phenomenological mechanism of vortex shedding as mentioned in this paper, i.e., surface protrusions, which affect separation lines and/or separated shear layers, etc.

TL;DR: In this paper simple formulae are given for the design of spires for use in simulating the planetary boundary layer, including some refinements to account for the presence of a ramp, or blockage caused by a model, and to include the effect of corner fillets.

TL;DR: In this article, a pulsed-wire anemometer was used to measure the turbulent wake of two-dimensional solid and porous fences immersed in the constant-stress region of a simulated rural atmospheric boundary-layer.

TL;DR: In this paper, the effects of stream turbulence on two-dimensional, separated and reattaching flows were investigated and it was found that the mean flow field responds strongly to turbulence intensity but with little effect of integral scale.

TL;DR: In this article, a sensor for measuring pedestrian-level winds in wind-tunnel models is described, which is axisymmetric about a vertical axis and outputs a pressure difference related to the wind speed at a chosen reference height just above the surface.

TL;DR: In this paper, the authors show that simple rules derived from a knowledge of the separate responses of a tower to galloping and vortex resonance may be useful for prediction of oscillatory behaviour under the mutual effects.

TL;DR: In this paper, the equations of motion for two-dimensional mean wind flow over single changes of surface roughness are solved numerically, using a scheme which has been adapted from computations of wind flow flow over hills.

TL;DR: In this article, the influence of surface roughness on transitions between subcritical, critical supercritical and postcritical regimes around isolated circular cylinders in cross-flow was investigated in an open-jet wind tunnel, which was modified to obtain satisfactorily bidimensional conditions, with Reynolds numbers ranging from 2.6 × 10 4 to ∼2.8 × 10 5.

TL;DR: In this article, a series of experiments were conducted on scale models of snowdrift controls on flat terrain (fences of various porosities, and simulated hedgerows).

TL;DR: In this paper, a covariance integration method for the determination of fluctuating overall structural loads due to wind and their effects on low-rise buildings is described, using aerodynamic data obtained from a 1 50 -scale wind tunnel model.

TL;DR: In this paper, the authors show that aerodynamic damping is equally effective in mitigating or eliminating galloping excitation in sharp-edged cylindrical bodies, by appropriate modifications of details of the body, which can be changed such that the lateral exciting forces are reduced.

TL;DR: In this paper, a generalised one-dimensional flow prediction method for calculating the flow generated by a train in a single-track tunnel is presented, which is capable of modelling the effects of friction, gradual area change, heat transfer, locomotive heat release, vehicle leakage, and gravity body forces.

TL;DR: In this article, the authors describe a series of experiments concerned with wind effects on pedestrians, including walking tests in a large wind tunnel and observations of pedestrians in a precinct at the base of a high-rise building.

TL;DR: In this paper, the authors presented studies of windbreaks as an aid to town planning and quantified pedestrian comfort in terms of the sizes of areas having a specified wind-speed reduction, resulting from the use of wind-breaks.

TL;DR: In this paper, an introductory study of the dynamics of the shear layer separating from the front edge of two-dimensional, surface-mounted, square-section blocks is reported.

TL;DR: In this paper, an experimental investigation on circular and square-section models of finite height in a turbulent shear flow was conducted at a subcritical Reynolds number of 22 × 104 based on the characteristics lateral dimension of the model and the reference velocity at the top of the mean velocity profile.

TL;DR: In this article, a quasi-steady average of smooth-flow wind-tunnel data is used to adjust the data to better represent road conditions, although the theory does not completely explain the behaviour observed in turbulence conditions.

TL;DR: In this paper, a comparison between wind pressures measured on two low-rise experimental buildings and pressure measured on wind-tunnel models of those buildings is made. But the results of the comparison are limited to the case of the first one and the second one.

TL;DR: In this article, the ratio of the longitudinal r.m.s. velocity σ to the friction velocity u ★ is compared for a number of sites for which these quantities are adequately defined.

TL;DR: In this paper, the structures of the time-averaged wakes of three characteristic vehicle shapes, viz Fastback, Notchback and Estate, have been studied on the basis of flow visualisation and wake surveys done at various downstream stations behind quarter-scale models in a wind tunnel.

TL;DR: In this article, the effects of cab shape on air flow and drag on trucks were investigated in a wind tunnel with a 1:5 scale model of an articulated road train and a simplified cab model.

TL;DR: In this paper, the authors discuss the differentiation of these effects and possible ways of calculating their combined effect, and propose a method to calculate the combined effect of surface and internal flow forces.

TL;DR: In this paper, a transverse vortex structure is produced by means of a rotor whose surface moves in an upstream direction, and an improvement is found for a rearward-facinf acting as a diffuser.

TL;DR: In this paper, the mass-damping effect of strakes on the upper part of a cylindrical stack has been investigated and it has been shown that the effect of fitting a cone on the lower part of the stack is negligible for the vortex-exciting oscillation.

TL;DR: In this paper, a 6th scale Ford D1614 cab/chassis model was fitted with a movable container in order that the cab-container gap could be varied to simulate either a rigid or an articulated vehicle.

TL;DR: In this paper, experimental observations of the across-wind response of a group of four chimneys in turbulent shear flow are presented and discussed, and in order to interpret the results in terms of the likely full-scale behaviour, semi-empirical mathematical models were developed for the prediction of both an isolated structure and one subject to wake buffeting.

TL;DR: In this paper, a 1:200-scale, seven-level lumped-mass model with three degrees of freedom per floor has been designed and constructed to simulate the dynamic behaviour of a 57-storey office building in Toronto.