Journal ArticleDOI
Appropriate boundary conditions for computational wind engineering models using the k-ϵ turbulence model
Peter Richards,R.P. Hoxey +1 more
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In this paper, velocity and turbulence profiles associated with the k-ϵ turbulence model are proposed which produce homogeneous conditions, and the cospectrum for the Reynolds stress exhibits a characteristics frequency n o ≈ u ∗ / z which is consistent with the suggested profile equations.About:
This article is published in Journal of Wind Engineering and Industrial Aerodynamics.The article was published on 1993-08-01. It has received 1044 citations till now. The article focuses on the topics: K-omega turbulence model & K-epsilon turbulence model.read more
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Comparative study of measured and modelled number concentrations of nanoparticles in an urban street canyon
Prashant Kumar,Prashant Kumar,Andrew Garmory,Matthias Ketzel,Ruwim Berkowicz,Rex Britter,Rex Britter +6 more
TL;DR: In this paper, a comparison between measured and modelled particle number concentrations (PNCs) in the 10-300-nm size range at different heights in a canyon is presented.
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Effect of wind direction on greenhouse ventilation rate, airflow patterns and temperature distributions
TL;DR: In this article, the effect of wind direction relative to a multi-span naturally ventilated greenhouse on the airflow patterns and air temperature distribution inside the house and at the openings is investigated, in a greenhouse with vertical roof openings.
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A comparison of three approaches for simulating fine-scale surface winds in support of wildland fire management: Part I. Model formulation and comparison against measurements
TL;DR: In this article, three types of wind models have been defined for simulating surface wind flow in support of wildland fire management: (1) a uniform wind field (typically acquired from coarse-resolution (~4km) weather service forecast models); (2) a newly developed mass-conserving model and (3) a new mass and momentum conserving model.
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Modelling wind flow and vehicle-induced turbulence in urban streets
TL;DR: In this paper, a computational fluid dynamics (CFD) modelling methodology for the simulation of the flow and turbulence induced by wind and vehicle motion within an idealised street canyon is presented, which can be used to gain insights into the mechanically driven turbulence for the dispersion of pollutants within urban streets.
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Model evaluation of roadside barrier impact on near-road air pollution
TL;DR: In this article, a 3-dimensional computational fluid dynamics (CFD) 6-lane road model has been developed to simulate roadside barrier effects on near-road air quality and evaluate the influence of key variables, such as barrier height and wind direction.
References
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Journal ArticleDOI
The numerical computation of turbulent flows
Brian Launder,D. B. Spalding +1 more
TL;DR: In this paper, the authors present a review of the applicability and applicability of numerical predictions of turbulent flow, and advocate that computational economy, range of applicability, and physical realism are best served by turbulence models in which the magnitudes of two turbulence quantities, the turbulence kinetic energy k and its dissipation rate ϵ, are calculated from transport equations solved simultaneously with those governing the mean flow behaviour.
Characteristics of turbulence in a boundary layer with zero pressure gradient
TL;DR: In this article, the results of an experimental investigation of a turbulent boundary layer with zero pressure gradient are presented and the importance of the region near the wall and the inadequacy of the concept of local isotropy are demonstrated.
Neutrally stratified boundary-layer flow over roughness changes and topography
TL;DR: In this paper, a linear model for neutral surface-layer flow over complex terrain is presented, which makes it possible to make high-resolution computations for an arbitrary distribution of surface roughness and topography.
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A mixed spectral finite-difference model for neutrally stratified boundary-layer flow over roughness changes and topography
TL;DR: In this paper, a linear model for neutral surface-layer flow over complex terrain is presented, which combines the simplicity and computational efficiency of linear methods with flexibility for closure schemes of finite-difference methods.
Journal ArticleDOI
Simulation of Effect of Wind Barriers on Airflow
TL;DR: In this article, the authors developed a quantitative, theoretical simulation of airflow normal to narrow wind barriers of various porosities and, when possible, verify the results using experimental data, using finite difference methods having a combination of upwind and central difference schemes.