Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 2019"

TL;DR: In this article, a review of control strategies for maximizing power production within wind farms is presented, focusing on three notable concepts; power de-rating, yaw-based wake redirection, and turbine repositioning.

TL;DR: In this paper, a review of the key parameters in the atmospheric boundary layer, in order to evaluate if the upstream wind flow in a numerical simulation is sufficiently generated, is presented and discusses the important aspects to take into account when applying CFD simulations for the determination of wind loads on high-rise buildings.

TL;DR: In this article, the influence of the train's nose length on aerodynamic performance was investigated using the improved delayed detached eddy simulation (IDDES) to study the influence on the aerodynamic properties of a train.

TL;DR: In order to increase the efficiency of straight-bladed vertical axis wind turbine (SB-VAWT), the inboard, outboard, two-side Gurney flap (GF) and dimple-GF were applied in this paper.

TL;DR: In this article, the influence of the airflow condition and the distance from the upstream end of the embankment model to the train model on the aerodynamic force coefficients is investigated.

TL;DR: In this article, two typical wind events including the thunderstorm wind and thermally developed wind are highlighted, and an automatic classification method is proposed to extract and separate these wind events, to capture the rapid variation of its maximum wind speed, mean temperature and mean humidity through the boxplot method.

TL;DR: In this paper, the authors investigated the wind characteristics along the bridge catwalk during construction in a deep-cutting gorge, where five sets of anemometers were installed in the catwalk to collect field measurements.

TL;DR: In this paper, the formation and evolution mechanism of aerodynamic heating in the tube and influence of the Mach number at subsonic, transonic, and supersonic speed were studied.

TL;DR: In this paper, an efficient method is developed to determine the power spectral density (PSD) of typhoon winds with the high-frequency subrange, which can be efficiently and automatically acquired without additional subjective operations as long as the inertial subrange in the traditional PSD is in advance estimated.

TL;DR: In this paper, the influence of the tower and nacelle on the behavior of the near-wake of a wind turbine has been investigated using particle image velocimetry using natural snowfall.

TL;DR: In this paper, the numerical solution of a high-speed train with several simplified bogies is investigated, and the results reveal that a simpler bogie structure can achieve a higher underbody flow velocity and change fluctuations beneath the train owing to the resulting turbulence level.

TL;DR: In this article, the authors employed the Improved Delayed Detached Eddy Simulation (IDDES) method to analyze the differences in flow fields around single-and double-unit trains, and the results showed that the existence of the double region concentrates the Strouhal number of the aerodynamic force of the wake at 0.15.

TL;DR: In this article, the aerodynamic performance of double unit trains and traditional single unit trains under crosswinds was analyzed using the improved delayed detached eddy simulation (IDDES) method for 1/8th scale models.

TL;DR: The available data supports the conjecture that real-time simulation of urban air flow is feasible at the neighborhood scale with the proposed numerical technique.

TL;DR: In this article, an improved delayed detached eddy simulation (IDDES) method based on shear-stress transport k-ω turbulence model has been used to investigate the slipstream and wake flow around a high-speed train with different bogie fairings at Re

TL;DR: In this article, the influence of different windbreak walls on train aerodynamic properties whilst subjected to crosswinds was assessed, where the authors measured surface pressures on a stationary 1:25 model-scale of Class 390 Pendolino train under varying wind incidence angles with different wind break walls inside a wind tunnel.

TL;DR: In this article, the effects of the front bogie position on the aerodynamic performance and near wake of a three-carriage high-speed train are investigated using three-dimensional steady incompressible Reynolds-averaged N-S equations and Realizable k-e two-equation turbulence model.

TL;DR: In this article, the wave structure is mainly composed of expansion waves, reflected shock waves and normal shock waves as ETMT moves for enough time at the speed of 1250 km/h.

TL;DR: In this article, a series of 2D steady RANS CFD simulations are conducted to investigate the impact of roof slope on the snow redistribution on gable roofs, and a small value of turbulent Schmidt number, which is calibrated by trapping efficiency from experiments, is adopted to enhance the snow particles' turbulent diffusion.

TL;DR: In this article, the post-flutter limit cycle oscillation (LCO) of a two-degree-of-freedom bridge deck involving aerodynamic nonlinearities is studied using computational fluid dynamics (CFD) simulations.

TL;DR: In this article, a comprehensive investigation of gust characteristics, which are usually quantitatively expressed as the turbulence intensity and gust factor, for the near-ground typhoon winds was conducted based on 14 sets of records observed by 4 meteorological stations during 10 typhoons.

TL;DR: In this paper, the effects of porous shelters alongside a high speed track on a model of a high-speed train were investigated using a Computational Fluid Dynamics (CFD) code based on the Lattice Boltzmann Method.

TL;DR: In this paper, large-eddy simulations were performed for the velocity fields around a 1:1:2 single block model to clarify the effect of the numerical viscosity in different advection schemes.

TL;DR: In this paper, a closed-box bridge girder subject to wind at an initial attack angle of + 3° was analyzed to reveal the VIV-triggering mechanism for a bridge girders.

TL;DR: In this article, the stationary aerodynamic performance of a twin-box bridge girder at different angles of attack is studied, and different central slot widths are considered as well.

TL;DR: In this article, a knowledge-enhanced deep learning algorithm was developed to simulate the wind field inside tropical cyclone boundary-layer, where the machine-readable knowledge in terms of both physics-based equations and/or semi-empirical formulas was leveraged to enhance the regularization mechanism during the training of deep networks for dynamics of tropical cyclon boundary layer winds.

TL;DR: In this paper, the formation and development of the slipstream induced by a train (5 cars) with a 4-m nose length were analyzed in detail, including at different heights and widths on the windward side (WWS) and leeward side (LWS).

TL;DR: In this article, a novel directional decomposition strategy is formulated, which makes the study of thunderstorm outflows and synoptic winds fully coherent, and the results provided by the classic and novel decomposition rules are first compared and elucidated with reference to a couple of real thunderstorm and Synoptic wind velocity records.

TL;DR: In this paper, the surface flow patterns on a wall-mounted square cylinder and their relationship with pressure were investigated numerically using a fine Cartesian grid, and a combination of the building cube and immersed boundary methods and results, including mean pressure, root mean square (rm.m.s) pressure, and flow fields are validated qualitatively and quantitatively through experiments.

TL;DR: A multi-objective optimization of the nose of a high-speed train in two different scenarios involving lateral stability, namely two trains passing by and a train subjected to crosswind is developed, and a Pareto front is obtained.