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
Citations
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Dynamic flow analysis using an OpenFOAM based CFD tool: Validation of Turbulence Intensity in a testing site
TL;DR: In this article, the validation of the turbulence intensity (TI) modeled by a CFD tool has been investigated, where six meteorological masts, equipped with cup anemometers, have been used for the purpose.
Journal ArticleDOI
The wind effect on sound propagation over urban areas: Predictions for generic urban sections
TL;DR: In this article, the effect of a downward refracting atmosphere on distant sound propagation over various generic urban areas is predicted using a two-step approach, by first computing the wind field with computational fluid dynamics (RANS-CFD), and then adopting the mean wind field in a computational acoustics (PSTD-CA) method.
Journal ArticleDOI
Predicting mean velocity profiles inside urban canyons
TL;DR: In this paper, the authors present an alternative strategy based on the existence of intense layers of vorticity at solid boundaries and the roof level, where the velocity field is modelled by approximating the vortexicity field, spatially and temporally averaged vertical profiles of the horizontal velocity components are derived from the numerical Green's functions for the three-dimensional Poisson equation and vortex sheets located at the top and bottom of an urban canyon; mean profiles are obtained similarly.
Dissertation
Étude du méandrement du sillage éolien lointain dans différentes conditions de rugosité
TL;DR: In this article, a traitee en deux parties, the premiere portant sur la modelisation de l'ecoulement de couche limite atmospherique, avec une attention particuliere portee a modelisation des grandes echelles de the turbulence atmosphereherique.
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Improving pedestrian micro-climate in urban canyons: City Center of Alexandria, Egypt
TL;DR: In this paper, a Computational Fluid Dynamics (CFD) simulation of a residential district in the modern city of Alexandria which contains the library of Alexandria and the two oldest paved roads in the world which still remain in use until today.
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.
Journal ArticleDOI
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.