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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Sustainable design of courtyard environment: From the perspectives of airborne diseases control and human health
Jiawei Leng,Qi Wang,Ke Liu +2 more
TL;DR: In static wind conditions, infection possibility in courtyard was comparable to those in indoor environments during the COVID-19 period, and this work will be of great importance for sustainable development of courtyards from the perspectives of airborne diseases control.
Journal ArticleDOI
Wind flow simulations on idealized and real complex terrain using various turbulence models
Daniel S. Abdi,Girma Bitsuamlak +1 more
TL;DR: Re-conducting the simulations at model scale dimensions, hence at relatively small Reynolds number, and without using wall functions gave results that are comparable to those found in the literature, therefore, use of wall functions can degrade quality of results in LES of high Reynolds number flows of practical interest.
Journal ArticleDOI
Numerical estimation of the internal and external aerodynamic coefficients of a tunnel greenhouse structure with openings
TL;DR: In this article, the external and internal aerodynamic coefficients on a tunnel (vaulted-roof) structure with openings are numerically calculated in the case of a transverse wind, using the Finite Element method.
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Modelling NOX concentrations through CFD-RANS in an urban hot-spot using high resolution traffic emissions and meteorology from a mesoscale model
Beatriz Lardiés Sánchez,Jose Luis Santiago,Alberto Martilli,Fernando Martín,Rafael Borge,Christina Violetta Quaassdorff,David de la Paz +6 more
TL;DR: In this article, a methodology based on weighted average of CFD simulations is applied computing the time evolution of NO x dispersion as a sequence of steady-state scenarios taking into account the actual atmospheric conditions.
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A numerical investigation of reactive air pollutant dispersion in urban street canyons with tree planting
TL;DR: In this paper, the effects of vegetation on the dispersion of reactive pollutants using a computational fluid dynamic (CFD) model coupled with NO-NO2-O3 photochemistry were investigated.
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.