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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An investigation on the effect of street morphology to ambient air quality using six real-world cases
TL;DR: In this paper, the authors investigated the relationship of street morphology to air quality for 6 irregular real-world cases selected from America, Europe, and China, i.e., Manhattan, Paris, Barcelona, Berlin, London and Nanjing each street is analyzed as a set of slices to propose a couple of morphology indices for quantitatively assessing the actual street morphology.
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CFD simulation of CO2 dispersion from urban thermal power plant: Analysis of turbulent Schmidt number and comparison with Gaussian plume model and measurements
TL;DR: In this paper, computational fluid dynamics simulations of carbon dioxide (CO 2 ) dispersion from a natural gas-fueled thermal power plant in an urban environment are compared with experimental measurements of column-averaged dry-air mole fraction (XCO 2 ), obtaining a good agreement.
Journal ArticleDOI
CFD modelling of vegetation barrier effects on the reduction of traffic-related pollutant concentration in an avenue of Pamplona, Spain
Jose Luis Santiago,Riccardo Buccolieri,Esther Rivas,Héctor Calvete-Sogo,Beatriz Lardiés Sánchez,Alberto Martilli,Rocío Alonso,David Elustondo,Jesús Miguel Santamaría,Fernando Martín +9 more
TL;DR: In this paper, the authors used Computational Fluid Dynamics (CFD) modeling, previously validated against BC experimental data across a vegetation barrier located in an avenue of Pamplona (Spain), is applied to simulate different barrier configurations.
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A methodology to urban air quality assessment during large time periods of winter using computational fluid dynamic models
TL;DR: In this paper, a model based on the steady-state Reynolds-Averaged Navier-Stokes equations (RANS) and standard k-ɛ turbulence model was used to simulate a set of 16 different inlet wind directions over a real urban area (downtown Pamplona, Spain).
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Aeolian dynamics of beach scraped ridge and dyke structures
TL;DR: In this article, the authors investigated the near surface flow and transport potential of three artificial structure designs: a single ridge, a double ridge and a dyke, and the results suggest that the double ridge structure is the most resilient to aeolian erosion.
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.