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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Analysis of convective heat and mass transfer at the vertical walls of a street canyon
TL;DR: In this article, a two-step methodology for the simulation of drying processes is proposed and subsequently applied to study the drying behavior of both vertical walls of a square-shaped street canyon.
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A study on the inclusion of forest canopy morphology data in numerical simulations for the purpose of wind resource assessment
TL;DR: In this paper, a series of numerical simulations of the flow over a forest stand have been conducted using two different turbulence closure models along with various levels of canopy morphology data, and it was found that an accurate assessment of the porosity of the canopy, and specifically the variability with height, improves simulation quality regardless of the turbulence closure model used or the level of canopy geometry included.
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Quality assurance of the prognostic, microscale wind-field model GRAL 14.8 using wind-tunnel data provided by the German VDI guideline 3783-9
TL;DR: In this paper, a refined microscale flow field model has been implemented in the Lagrangian Particle Model (LPM) Graz Lagrangians Model (GRAL) to provide flow fields for its dispersion module, which is based on the Reynolds-averaged Navier-Stokes equations and uses a standard k-e turbulence model.
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CFD Based Study of Heterogeneous Microclimate in a Typical Chinese Greenhouse in Central China
TL;DR: Wang et al. as discussed by the authors used a CFD model to simulate convective transfers and radiative exchanges at the cover and the roof, instead of using the usual coupling approach based on energy balance.
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Numerical Site Calibration Over Complex Terrain
TL;DR: In this article, the authors present the development and assessment of a numerical method for simulated site calibration using FLUENT, where the wind flow over complex terrain is predicted with a small length scale resolution, with the Reynolds averaged Navier-Stokes equations, complemented by the k-ϵ turbulence model, with special treatment of the ground boundary to account for very large roughness lengths such as forest.
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.
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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.