Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 2018"

TL;DR: In this paper, a wake model for wind turbines considering ambient turbulence intensity and thrust coefficient effects is proposed by numerical and analytical studies, which is derived based on the axial symmetry and self-similarity assumption for wake deficit and added turbulence intensity.

TL;DR: In this paper, the authors provide some views on the progress made recently in the areas of wind resource assessment in the urban habitat; the utilization of suitable wind turbines for enhancing the exploitation of these resources; and the significant role of knowledge of building and urban aerodynamics for an optimal arrangement of interfacing augmented wind with its extraction mechanisms.

TL;DR: In this article, high-resolution CFD simulations are performed with the RANS equations and the Transition SST-k-ω model to investigate the drag reductions in two pelotons of 121 cyclists.

TL;DR: In this article, a data-driven approach using a machine learning (ML) scheme is proposed to model VIV response based on a database of field-measured VIVs for a full-scale long-span suspension bridge over six recent years.

TL;DR: The paper introduces original categorizations of both the wind blown sand-induced performance deficiencies of the railway systems and the prevention techniques to mitigate the windblown sand effects (Source-Path-Receiver categorization of the Sand Mitigation Measures).

TL;DR: In this paper, the authors present a case study of Chengdu Urban Ventilation Corridor Plan to demonstrate the implementation of such considerations in local planning exercises and discuss the future trend of urban ventilation assessment and urban ventilation corridor plan in China.

TL;DR: In this paper, a review on computational fluid dynamics (CFD) applied to urban wind energy exploitation is presented, which comprises technical CFD aspects relevant for this application and the current state-of-the-art in building aerodynamics applied to Urban wind energy.

TL;DR: In this article, the influence of wind angles on the behavior of a high speed train was investigated using a scaled-down wind tunnel model (1:8 scale) at the wind angles of 0°, 5.14°, 10.2°, 15.11°, and 19.8°.

TL;DR: In this article, the effect of relative ground motion on slipstream for three different ground/wheel configurations was investigated, and it was concluded that its effect is mainly restricted to be within the bogie regions, with limited influence on the wake behind the train.

TL;DR: The performance of the WPD-DBSCAN-ENN hybrid method outperformed those of the other methods indicated above and was also compared with a single ENN via four general error criteria.

TL;DR: In this article, a flanged diffuser shroud mechanism is proposed to draw the airflow over buildings utilizing its special features such as, cycloidal curve geometry at the inlet and a vortex generating flange at the outlet, to guide and accelerate the airflow inside.

TL;DR: In this article, the aerodynamic performance of stationary and moving CRH2c trains with or without a wind-break wall under cross-wind was simulated by DDES based on the SST κ-ω turbulence model.

TL;DR: A new hybrid method of correlation-aided discrete wavelet transform, least squares support vector machine and generalized autoregressive conditionally heteroscedastic (GARCH) model is proposed, which has satisfactory performance in both accuracy and stability in wind speed prediction.

TL;DR: In this paper, the influence of grid density, calculation time step, and turbulence model on the pressure caused by the train entering the tunnel was analyzed, which is helpful for choosing suitable values of the aforementioned parameters to simulate the aerodynamic performance of the train in the tunnel.

TL;DR: In this article, a major series of experiments is described that included extensive full-scale measurements of cross wind induced pressures on the Class 43 New Measurement Train over an extended 21 month period, together with wind tunnel, moving model tests and CFD calculations, and allows, for the first time, a proper evaluation of the adequacy of these techniques.

TL;DR: In this paper, the authors discuss the considerations and limitations of different SUAS configurations, in particular Multi-rotor UAS (MUAS), and their capabilities when operating within the Atmospheric Boundary Layer (ABL).

TL;DR: In this paper, wind speeds and bridge deck accelerations along the Hardanger Bridge girder were recorded by the monitoring system installed on the bridge using 10-minute stationary averaging intervals.

TL;DR: A large scale and high-resolution surface pressure and Particle Image Velocimetry measurements were carried out in a new testing chamber, the WindEEE Dome, to investigate the structure of stationary tornado-like vortices and their surface layer over a broad range of swirl ratios and at the highest radial Reynolds numbers ever achieved in laboratory simulations of tornadoes as mentioned in this paper.

TL;DR: In this article, five methods to estimate the spatially and temporally-averaged wind-speed profile are compared in London: the logarithmic wind law (LOG), the Deaves and Harris equilibrium (DHe) and non-equilibrium (DHv) models; an adaptation of the power law (PL) and the Gryning et al. (GR) profile.

TL;DR: A novel test system for the aerodynamic test of vehicles travelling across the bridges was devised and it reveals that aerodynamic coefficients of the train measured with a static train model are different from those measured with the dynamic train model.

TL;DR: In this paper, a reduced calculation pattern was proposed by carrying out the scale analysis of three dimensional Navier-Stokes equations to solve the wind velocity field in the typhoon boundary layer.

TL;DR: A new compound mode of bogie cut outs is proposed, achieving 2.92% drag reduction for a three-car model, and those numerical results closely agree with the experimental data.

TL;DR: In this article, the effect of the blade sweep direction, the location of the sweep start up and the tip offset on the aerodynamic performance of horizontal axis wind turbines with forward and backward swept blades was investigated.

TL;DR: In this paper, an extensive computational study of the unsteady flow around a pitching NACA0012 airfoil at a Reynolds number of 1.35'×'105' is presented.

TL;DR: In this article, the transient variations of flows and pressures structure as a train enters a tunnel with the entrance in crosswind condition is studied, and correlations between the behavior and the temporal evolution of both the aerodynamic coefficients and their change rates have been discussed qualitatively based on lateral force, lift force, overturning moment, yawing moment and pitching moment.

TL;DR: In this paper, an uncertainty analysis method for tower structures subjected to a wind load is presented, where random samples of material properties and section dimensions are generated based on the Latin Hypercube Sampling technique and then used to establish uncertain finite element models for transmission towers.

TL;DR: In this paper, the effects of building corner modifications on reduction of wind loads on high-rise buildings, a benchmark square model and three corner modified models including recessed, chamfered and rounded are tested by pressure measurements in a boundary layer wind tunnel.

TL;DR: In this paper, the alleviation effect of partially enlarged cross-section on tunnel aerodynamics was investigated by comparing the numerical results to moving model tests data, the SST k-ω turbulence model and hybrid grid are used for the numerical simulations of high-speed train passing through tunnel.

TL;DR: In this paper, the aerodynamic characteristics of a train on a bridge under cross-winds are studied by using a wind tunnel, and the results show that the relationship curves between aerodynamic coefficients and the yaw angle obtained by adjusting the train speed are very different to those by changing the incoming wind velocity and wind angle.

TL;DR: In this paper, the existence of two stable wake states: flow state I and flow state II were confirmed numerically by using the partially-averaged Navier-Stokes (PANS) turbulence model for various configurations of the Ahmed body.