Showing papers in "Journal of Wind Engineering and Industrial Aerodynamics in 2011"

TL;DR: In this article, a tuning-free Lagrangian scale-dependent dynamic model is used to model the dynamics of subgrid-scale turbulent fluxes and turbine-induced forces.

TL;DR: In this article, the authors used LES to model plume dispersion in a simple street canyon model and to clarify the mechanism of the discrepancy in relation to RANS computation.

TL;DR: In this article, the inlet profiles and boundary conditions appropriate for modeling the flow using the standard k-e, RNG k−e, Wilcox k−ω and LRR QI turbulence models are provided.

TL;DR: In this paper, the authors examined the prediction accuracy of pollutant dispersion within an urban street canyon of width to height ratio W/H=1 using two steady-state Reynolds-averaged Navier-Stokes (RANS) turbulence closure models, the standard k-e and Reynolds Stress Model (RSM), and Large Eddy Simulation (LES) coupled with the advection-diffusion method for species transport.

TL;DR: A modified formulation of the Richards and Hoxey wall function for turbulence production is presented to avoid the well-documented over-prediction of the turbulent kinetic energy at the wall and a modification of the standard k–e turbulence model is proposed to allow specific arbitrary sets of fully developed profiles at the inlet section of the computational domain.

TL;DR: In this article, an investigation into wake and solid blockage effects of vertical axis wind turbines (VAWTs) in closed test-section wind tunnel testing is described, which provides evidence of the effects of large wall interactions and wake propagation caused by these models at well below generally accepted standard blockage figures.

TL;DR: In this paper, the authors describe difficulties in the proper evaluation of obstacle-resolving urban CFD models and present a concept for the provision of validation data based on a combination of field and boundary layer wind tunnel experiments.

TL;DR: In this paper, the authors explored the possible impacts of wind farms on local hydrometeorology using a mesoscale model equipped with a rotor parameterization based on data from a commercial wind turbine and found that wind farms significantly affect near surface air temperature and humidity as well as surface sensible and latent heat fluxes.

TL;DR: In this paper, a new approach to model aerodynamic nonlinearities in the time domain utilizing an artificial neural network (ANN) framework with embedded cellular automata (CA) scheme has been developed.

TL;DR: In this article, the authors introduce the ventilation potential (VP) as a statistical, climate-dependent measure to assess the removal of scalars, such as heat and pollutants, from courtyards or urban street canyons.

TL;DR: In this paper, the effects of adjacent buildings on pollutant dispersion were examined using Computational Fluid Dynamics (CFD) simulations using the Realizable k-e model for different turbulent Schmidt numbers and wind tunnel experiments.

TL;DR: In this paper, the interference effects for local peak pressure on a principal building with various configurations and different height ratios of an interfering building were investigated using wind tunnel experiments for various locations, different height ratio of interfering building and wind directions.

TL;DR: In this article, an advanced multi-scale weather modeling system, WRF-RTFDDA-LES, is designed to simulate synoptic scale (∼2000km) to small- and micro-scale ( ∼100 m) circulations of real weather in wind farms on simultaneous nested grids.

TL;DR: In this paper, the effect of inflow turbulence (both velocity and temperature) on flow field and gas/thermal dispersion for the LES calculation was clarified. But the results showed that both RANS models overestimated the size of the recirculation region behind the building and underestimated the lateral dispersion of the gas.

TL;DR: In this paper, the authors studied various parameters of the tube train system such as the internal tube pressure, blockage ratio, and operating speed through computational analysis with a symmetric and elongated vehicle.

TL;DR: In this article, a van der Pol-type equation is used in the Ehsan-Scanlan's model, which for practical reasons seems to be the more suitable model for vortex-induced vibration of bridge decks.

TL;DR: In this article, the authors experimentally and numerically studied such flows through high-rise square building arrays as the approaching rural wind is parallel to the main streets and found that wind speed is found to decrease quickly through highrise building arrays.

TL;DR: Methods used to parameterise obstacle effects in a MeM are summarised in this paper using results of the mesoscale model METRAS as examples.

TL;DR: In this paper, a high-sided lorry in flat ground and high-turbulence conditions has been evaluated in the wind tunnel of the Politecnico di Milano wind tunnel to determine which parameters (geometry and vehicle type, infrastructure scenario, turbulence conditions, etc.).

TL;DR: In this article, the authors combine numerical weather prediction and computational fluid dynamics (CFD) to produce locally-specific flow patterns that could be used for micro-siting wind power plants.

TL;DR: In this article, three wind models are compared to near-surface time-averaged wind measurements obtained in downtown Oklahoma City during the Joint Urban 2003 Field Campaign, and a qualitative comparison of the model-computed flow fields with the JUWC 2003 wind measurements is conducted.

TL;DR: In this paper, the effectiveness of honeycomb and honeycomb-screen combinations, in reducing swirl and turbulence level in the test section, is studied by simulating the flowfield using commercial computational fluid dynamics (CFD) package ANSYS-CFX.

TL;DR: In this paper, a scaling procedure based on length, velocity, and vorticity scales from within the outflow is proposed, allowing for direct comparison between outflows from the two models.

TL;DR: In this article, the flow structures, wake-flow characteristics and drag coefficients of a square cylinder at various Reynolds numbers (Re) and incidence angles (θ) were experimentally studied in an open-loop wind tunnel.

TL;DR: In this paper, a panel discussion was held at CWE2010 to promote a conversation on the topic of how Computational Wind Engineering (CWE) can become a commonplace tool in the various subdisciplines of wind engineering (structural loading, dispersion, sediment transport, ventilation and wind power) to complement, and eventually replace, physical modeling.

TL;DR: In this paper, the authors deal with the three-dimensional simulation of the unsteady flow around a stationary 5:1 rectangular cylinder at zero-degree angle of attack, low Mach number (M∞=0.1) and high Reynolds number (Re=26,400, based on the plate thickness).

TL;DR: In this paper, a simple extension of the shear stress boundary condition at the top of the domain and by using one-dimensional models to generate inflow profiles in equilibrium with the ground boundary condition are presented.

TL;DR: In this article, the LES turbulence model for two typical swirl ratios of 0.31 and 0.65 was used to obtain the core radii of simulated vortices.

TL;DR: The present paper focuses on downscaling MMM from a meteorological point of view and to understand the differences in the purposes and approaches of MMM and CWE models and to identify issues and explore ways of coupling CWE modeling capabilities.