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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Isothermal and non-isothermal flow in street canyons: A review from theoretical, experimental and numerical perspectives
TL;DR: In this paper, a review of the field of street canyon flows is presented, with an outlook to most challenging research questions towards understanding of microclimate of full-scale realistic street canyons.
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An adaptive temperature wall function for mixed convective flows at exterior surfaces of buildings in street canyons
TL;DR: In this article, an adaptive temperature wall function (AWF) was derived that varies between the two existing WFs dependent on the local Richardson (Ri) number, which can account for the co-occurrence of forced and mixed convective flow regimes at a single surface.
Journal ArticleDOI
The effect of an urban park on the microclimate in its vicinity: a case study for Antwerp, Belgium
Yasin Toparlar,Yasin Toparlar,Bje Bert Blocken,Bje Bert Blocken,Bino Maiheu,G. J. F. van Heijst +5 more
TL;DR: In this article, the authors investigated the cooling potential of an urban park in Antwerp, Belgium focusing on two parameters: (1) intensity of the cooling effect, indicating the maximum reduction in air temperature and (2) range of cooling effect; the maximum horizontal distance where a minimum of 0.1°C cooling effect is present.
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Optimization procedures for enhancement of city breathability using arcade design in a realistic high-rise urban area
TL;DR: In this paper, the authors examined the ventilation performance in a realistic high-rise urban area and its associated city breathability in terms of the ACH* (defined as the ratio of ACH to a characteristic frequency, determined by the reference velocity of the far upstream free flow divided by reference building height) with or without incorporating an arcade into the object buildings.
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A Review of Urban Wind Energy Research : Aerodynamics and Other Challenges
TL;DR: An outlook toward future research and the need to treat the different flow scales in a holistic manner is emphasized given also the recent advances in rotor aerodynamics related to the effect of flow skewness and turbulence.
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.