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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Thermal performance prediction of street trees inside isolated open spaces – evaluations from real scale retrofitting project
TL;DR: In this article , computational fluid dynamics (CFD) simulations using unsteady Reynolds-averaged Navier-Stokes (URANS) equations have been performed to analyze the cooling effect of street trees for heatwave period (18-22 June 2015) in a hot-humid urban environment.
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Experimental and Numerical Investigation on Vanes’ Effects on the Flow Characteristics in Sharp 60° Bends
TL;DR: In this paper, the effect of middle vanes on the flow structure in open-channels with sharp 60° bends was investigated. But the results were limited to two cases, i.e., bends with (one-vane case), and without (no-vANE case) mid vanes, and the validation process showed satisfactory agreement between the measured and predicted results with average RMSEs of 0.18 and 4.82, respectively.
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The use of commercial CFD software to model the atmospheric boundary layer
D. M. Hargreaves,N. G. Wright +1 more
TL;DR: It is shown that the neutral ABL can be maintained along a lengthy fetch but only with a modified law of the wall and with a shear stress applied to the top boundary of the domain.
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Comparison of different mechanical ventilation systems for dairy cow barns: CFD simulations and field measurements
Ali Pakari,Saud Ghani +1 more
TL;DR: In this paper, three different ventilation systems for dairy cow barns were compared in terms of the airflow inside the barn using Computational Fluid Dynamics (CFD) simulations, and the results showed that it is necessary to have fans on the inlet and exhaust ends of the barn to obtain relatively sufficient and uniform air velocity along the barn.
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Modified ‘closure’ constants of the Standard k–ε turbulence model for the prediction of wind-induced natural ventilation
TL;DR: In this article, wind-driven natural ventilation in buildings is investigated by means of computational fluid dynamics, and the airflow in and around three pilot buildings, which correspond to the most common natural-ventilation designs, is simulated by applying both the Standard and a modified k-e turbulence model.
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.