Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 2008"

TL;DR: In this paper, the authors present guidelines for using computational fluid dynamics (CFD) techniques for predicting pedestrian wind environment around buildings in the design stage, based on cross-comparison between CFD predictions, wind tunnel test results and field measurements.

TL;DR: In this paper, the authors summarize fundamental results and discoveries concerning vortex-induced vibration, that have been made over the last two decades, many of which are related to the push to very low mass and damping, and to new computational and experimental techniques that were hitherto not available.

TL;DR: The results obtained showed a remarkable improvement in the model forecasting skill, with a significant reduction of the required CPU time in the case of wind power prediction.

TL;DR: In this article, wind tunnel tests were conducted to assess the aerodynamic performance of single-, two-and three-stage Savonius rotor systems with both semicircular and twisted blades.

TL;DR: In this article, the authors compared computational fluid dynamics (CFD) results using various revised k-e models and large eddy simulation (LES) applied to flow around a high-rise building model with 1:1:2 shape placed within the surface boundary layer.

TL;DR: This paper reviews the recent developments in CWE research for predicting the pedestrian level wind and thermal environments in urban areas and achievements in the field of modeling canopy flows for reproducing the aerodynamic and thermal effects of trees, buildings and automobiles are outlined.

TL;DR: In this paper, a wind turbine system consisting of a diffuser shroud with a broad-ring flange at the exit periphery and a turbine inside it was developed, and demonstrated power augmentation for a given turbine diameter and wind speed by a factor of about 4-5 compared to a standard (bare) wind turbine.

TL;DR: In this article, an extra term was added to the approximate transport equation for the turbulence energy dissipation rate, which significantly improved agreement with experimental data to validate the model, results are presented for the Nibe wind turbine ‘B’, the Danwin 180/23, and the MOD-0A.

TL;DR: In this paper, steady-state RANS simulations of pollutant dispersion in the neutrally stable atmospheric boundary layer are made with the commercial code Fluent 6.1 for three case studies.

TL;DR: In this paper, the effects of the turbulence intensity and the train motion on the aerodynamic coefficients have been studied in a train scale model with three types of rail vehicles, in different configurations, in order to point out the most critical wind conditions with respect to running safety.

TL;DR: In this paper, the authors investigate numerically the flow around the Ahmed body for the base slant angles 25° and 35° and show that the two-dimensional behavior of the wake flow, for the slant angle 35 ∘, is well predicted.

TL;DR: In this paper, the authors compare conventional techniques, such as linear models and cup anemometers, with flow simulation by computational fluid dynamics techniques (nonlinear models) and measurements by sonic anemometer, and discuss their relative merits in the characterisation of the wind over a coastal region.

TL;DR: In this paper, Monte Carlo-based approaches are employed for numerical simulations of wind loads and their effects in the design of structures to ensure their safety under winds and their response and assessment of attendant functionality and safety under service and design loads.

TL;DR: In this article, the accuracy of the canopy models for reproducing the aerodynamic effects of trees based on k-e model was examined for the CFD prediction of wind environment at pedestrian level.

TL;DR: In this article, the effects of vortex shedding on the wind loading of tall buildings and bridges, particularly the loading in the across-wind direction, are discussed. But the authors do not consider the effect of wind turbulence on the shape changes and supplemental damping devices.

TL;DR: In this paper, a mathematical model is developed for predicting wind-induced oscillations of a high-rise building with a tuned mass damper (TMD) when the soil-structure interaction (SSI) is considered.

TL;DR: In comparison with grass and shrub patterns, greening with tree does not always have better effects for improving pedestrian thermal comfort in summer in all directions around buildings, and the average SET in the pedestrian space has a slight difference.

TL;DR: In this article, a generic empirical equation for radial velocity profile is developed based on the experimental data, using hotwire, pressure rakes and particle image velocimetry (PIV), which is used to validate CFD simulations and to find the applicability of different turbulence models for this kind of flow.

TL;DR: In this paper, a method to determine the position of the separation point on the rotating blade, based on the chordwise pressure gradient in the separated area, is proposed to evaluate rotation and turbulence effects on a wind turbine blade aerodynamics, focusing particularly on stall mechanisms.

TL;DR: The present study discusses the applicability of LES to several issues such as practical use for windresistant design, wind velocity affected by the terrain or the ground surface condition, turbulence structures and atmospheric diffusion in the urban area.

TL;DR: In this article, the authors presented both quasi-steady and transient wind load effects on a cubic building in a microburst and a tornado large eddy simulation (LES) was used to simulate the loading effects of a translating microburst with a 020m-diameter jet at four different translating velocities on a 25 mm cube.

TL;DR: In this article, the authors used a LES method to investigate the fluctuating flow rate induced by wind with a CFD code capable of generating time-dependent and unsteady inflows.

TL;DR: In this article, the authors describe the dynamic and static model wind tunnel tests conducted and discuss the differences between divergent galloping motion and high-speed vortex excitation, showing that the characteristics of dynamic responses and aerodynamic forces of these two types of motion are different.

TL;DR: This paper presents activities of the Architectural Institute of Japan on computational wind engineering, focusing on numerical prediction of wind loads on buildings, and provides a guide for constructing a numerical model.

TL;DR: In this article, the authors investigated the use of statistical regime-switching models for wind power generation and showed that the regime switching approach based on Markov-Switching autoregressive (MSAR) models significantly outperforms those based on observable regime sequences.

TL;DR: The sensitivity of the orthonormal impinging jets with respect to scale (Reynolds number), boundary conditions (geometry and surface roughness) as well as inlet conditions is investigated in this paper.

TL;DR: In this paper, the vortex shedding response of a twin box bridge girder deck with and without guide vanes has been investigated at three different Reynolds numbers with the objective of identifying the mode of vortex excitation and suitable conditions for testing that will allow faithful evaluation of guide vane mitigation efficiency.

TL;DR: In this article, a row of square-plan tall buildings arranged in close proximity are investigated with wind tunnel experiments, where wind forces and moments on each building in the row are measured with the base balance under different wind incidence angles and different separation distances between buildings.

TL;DR: In this paper, the effect of the strong vortex system arising from the slant back was found to be the cause of the drag and lift changes of the rear vehicle, when compared to the drag of the body in isolation.

TL;DR: In this paper, the authors present some characteristics of stay-cable vibrations observed using a long-term full-scale measurement system and attempt to interpret these observations in a three-dimensional cable-wind context.