Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 1985"

TL;DR: In this article, the pattern of flow through a porous windbreak has been investigated numerically using several well-known closure schemes (turbulence models) and the shelter is included as a momentum extraction term in the streamwise momentum equation, for a fence having the value k r u | u |δ(x,0)s(z,H) where kr is the pressure-loss coefficient of the fence, ū is the local mean horizontal (x) velocity, δ (x, 0) is the delta function and s(z) is

TL;DR: In this article, the authors studied the interference response of a tall square building under interference excitation from neighbouring tall buildings in a series of wind-tunnel model tests and found that the interference loads on the upstream of an identical pair of tall buildings may increase by a factor of up to 4.4.

TL;DR: A knowledge of building wake characteristics is useful in a variety of applications including dispersion of pollutants downwind of conventional or nuclear power plants, airport runway interference effect, take-off/landing limitations at heliports, pedestrian wind comfort, and wind loads on structures.

TL;DR: In this article, the performance characteristics of the Savonius windmill rotor under field conditions were examined and design criteria established for the rotor overlap ratio was discussed and the performance data of the rotor was discussed.

TL;DR: In this paper, the boundary layer separation upstream of cylinders mounted normal to a flat plate leads to the formation of horseshoe vortices around the bases of these cylinders, which can be either laminar or turbulent, depending upon the state of the upstream boundary layer.

TL;DR: In this article, the influence of the roughness of the surface of a cylinder on the magnitude of the mean drag coefficient, the Strouhal number and the RMS lift coefficient is discussed.

TL;DR: The results of several series of experiments, which measured the wind characteristics over narrow railway embankments at both model and full scale, are described and discussed in this article, where the results show that the speed up of the flow over the embankment crests is well predicted by the data given by ESDU for the windward edge of wide embankings and escarpments with a 27° side slope.

TL;DR: In this paper, an experimental investigation of ground-level wind conditions around buildings with chamfered corners has been carried out in the boundary-layer wind tunnel of the Building Aerodynamics Laboratory of the Centre for Building Studies.

TL;DR: In this article, an extensive wind-tunnel study of the interaction between two square prisms with a height-to-base length equal to six was undertaken at the LAC, UFRGS.

TL;DR: In this article, the buckling behavior of closed-ended, thin cylindrical shells such as silos has been studied in both smooth and turbulent flows, and an empirical formula for the bucking pressure was proposed as a function of the height/radius ratio and the radius/ thickness ratio of the shell.

TL;DR: Wind Ship as discussed by the authors developed and tested at sea a 3, 000 ft2 soft sail cat rig and also designed a 3.000 ft2 wing sail based on the principal of feathering (without flutter) as a means of reefing or furling.

TL;DR: In this article, the relation between the spectra of base torques and generalized torques experienced by tall buildings is examined and the relationship between the two spectra and the actual generalized forces experienced by buildings is discussed.

TL;DR: In this paper, an experimental investigation was carried out into the aerodynamic forces acting on a rectangular prism with a square cross-section, placed vertically in a turbulent boundary layer, and the results showed that the effect of the angle of attack of approaching flow on aerodynamic force was similar to those obtained from a two-dimensional rectangular prism.

TL;DR: In this article, the authors made measurements of pressure distribution and surface oil flow visualisation studies in a wind tunnel at low Mach numbers on long slender bodies inclined to the stream at angles up to 30°.

TL;DR: In this article, full-scale measurements have been made under natural wind conditions to ascertain the wind loads on the canopy roofs of two modern ridged roof Dutch barns, and the results show that the pressure coefficients given in the British Standard Code of Practice CP3 are unsatisfactory for the design of ridged canopy roof structures.

TL;DR: In this paper, the authors describe a new boundary-layer wind tunnel at the Danish Maritime Institute in Lyngby, which is of the open-circuit type and is integrated into a building raised for the purpose.

TL;DR: In this paper, the aerodynamic characteristics of a number of devices capable of use for wind assisted fuel saving purposes are examined, including the Prolss Rig, High Lift Aerofoils, Rotating Cylinders, Wind Turbines and Kites.

TL;DR: In this article, the modelled equations of turbulent flow over two-dimensional bluff surface obstructions are solved numerically, using body-fitted coordinates and the k-ϵ two-equation model of turbulence.

TL;DR: In this paper, a new criterion for calculating the wind speed at which tanks fail can only be couched in probabilistic terms and while it is not yet possible to derive such a criterion, the necessary steps and research to do so are discussed.

TL;DR: Effets de secousses dynamiques sur des bâtiments de grande hauteur (IGH) groupes as mentioned in this paper were used for soufflerie.

TL;DR: In this article, the authors presented predictions of the two-dimensional turbulent flow around a hill, where the Reynolds equations were written in an orthogonal curvilinear coordinate system and transformed to finite difference form after discretisation in physical space.

TL;DR: In this article, a review of similarity criteria for simulating physical modeling of the atmospheric boundary-layer and source characteristics in a boundary layer wind tunnel is presented, which can provide a practical method for prediction of automobile exhaust concentrations that will result from proposed freeways or alternative traffic routings.

TL;DR: In this paper, a program of experimental measurements, both in the field in Cumbria in North-West England and on wind-tunnel terrain models, is described, and the results are used to assess a proposed empirical method of gust prediction and as an evaluation of the usefulness of windtunnel methods for the simulation of flows over complicated terrain.

TL;DR: In this paper, the effects of wind loads on the static profile and force transmission efficiency of a tether tied to a kite-like aerodynamic body has been theoretically examined and two important parameters which characterize the behavior of the tether have been obtained.

TL;DR: In this paper, a series of wind-tunnel tests have been conducted on the ovalling oscillations of closed-ended, thin cylindrical shells such as silos.

TL;DR: In this paper, the present day methods that are used to calculate the added resistance of a ship in a seaway are reviewed and a comparison is made between the different methods used.

TL;DR: In this article, four sample sites were selected for possible installation of both small and large wind energy conversion systems, and the manufacturers pre-mass production unit capital costs were used to estimate the cost of electricity produced, in cents/kW h.

TL;DR: A review of methods of saving fuel in commercial ships using wind assistance indicated that large kites used as elevated sails would require less modification to vessels than other proposed methods and, when recovered would leave the vessels unencumbered in port, congested waters or storms.

TL;DR: In this paper, the aerodynamic forces coefficients for a flexible membrane wing (sail) were determined using a numerical technique using the vortex lattice method, which can be used in coordination with a constrained numerical optimizer program to design optimal sails shapes.

TL;DR: In this article, an idealized stochastic model is set up on the basis of the empirically observed existence of a critical interval of undisturbed wind velocities upwind of the bar.