Computational Evaluation of Wind Loads on Low- and High- Rise Buildings

Dagnew, Agerneh K.

doi:10.25148/etd.fi12111904

Cited by 8 publications

(13 citation statements)

References 43 publications

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“…This result has been noticed by many authors as shown hereafter. In their application on tall buildings, Dagnew et al 32 have found that k-e model overpredicts the Cp at stagnation point and at flow separation point. This over-prediction is about 25%-30% at the flow stagnation point in the study of Wright and Easom.…”

Section: Numerical Results and Discussionmentioning

confidence: 98%

Wind potential evaluation around isolated pitched roof buildings

Bourabaa¹,

Delacourt

Menet³

2015

Journal of Renewable and Sustainable Energy

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The knowledge of wind field characteristics around buildings is very useful in a variety of applications such as energy supply by means of a domestic wind turbine. In this paper, results of a wind study around a conventional pitched roof building are given in order to choose the best location and therefore to maximize a micro-wind turbine production. Numerical results on a bluff body (cube) have been performed by means of computational fluid dynamics techniques and the Reynolds Averaged Navier-Stokes approach has been used to model the flow. Several turbulence models coupled to different near-wall treatments have been tested and have thus allowed one to determine the optimal configuration. Numerical model validation through the experimental data available in literature has made it possible to extend the study to a cube equipped with a pitched roof. Both sets of results thus obtained have allowed one to discriminate the effects from this particular element. Some of the computed data will be given in this paper in order to highlight the most significant regions relative to wind potential for a range of wind incidence angles. Some over speed areas have been found in the vicinity of the pitched cube for low altitudes. Finally, a simple method to map wind potential around buildings is proposed and a case study is presented. It deals with wind potential estimation for an isolated pitched roof building in Valenciennes (North of France). It is shown that some areas are beneficial for a micro wind turbine installation, even close to the building. V C 2015 AIP Publishing LLC. [http://dx. NOMENCLATURECp pressure coefficient Ei incident energy (kW hÁyear À1 Ám À2 ) Ep produced energy (kW hÁyear À1 Ám À2 ) f U velocity sector in wind rose f c angular sector in wind rose h height of the cube (m) k turbulent kinetic energy (m 2 s À2 ) P pressure (Pa) U mean velocity component in x-direction (m s À1 ) u* dimensionless velocity in the x direction X R reattachment length at the top of the cube (m) X W reattachment length in the wake of the cube (m) Yþ dimensionless wall distance a) Author to whom correspondence should be addressed. Electronic mail: nachida.bourabaa@univ-valenciennes.fr. Tel.: þ33 327 511 224. Fax: 33 327 511 200. b) Electronic addresses: eric.delacourt@univ-valenciennes.fr and jean-luc.menet@univ-valenciennes.fr 1941-7012/2015/7(2)/023111/17/$30.00 V C 2015 AIP Publishing LLC 7, 023111-1 JOURNAL OF RENEWABLE AND SUSTAINABLE ENERGY 7, 023111 (2015)Greek letters a angle between wind turbine position and the roof ridge b angle between the wind direction and the roof ridge c angle between the wind direction and the north e dissipation rate of k (m 2 s À3 ) l dynamic viscosity l t turbulent viscosity q air density (kg m À3 ) r s constant of the turbulence model

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Section: Numerical Results and Discussionmentioning

confidence: 98%

Wind potential evaluation around isolated pitched roof buildings

Bourabaa¹,

Delacourt

Menet³

2015

Journal of Renewable and Sustainable Energy

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“…Following the works of Dagnew [52] and Huang et al [53], the power-law wind profile was created to account for the wind speed modifications due to presence of urban surroundings, shown in Figure 4 and given by:…”

Section: Boundary Conditionsmentioning

confidence: 99%

Influence of Wind Buffers on the Aero-Thermal Performance of Skygardens

Mohammadi

Tien

Calautit

2020

Fluids

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Many high-rise buildings have semi-enclosed landscaped spaces, which act as design elements to improve the social and environmental aspects of the building. Designs such as skygardens are open to outdoor airflow and allow occupants to observe the city skyline from a height. Due to their often high location, they are subjected to strong wind speeds and extreme environmental conditions. The current study investigates the effects of three common wind buffers (railing, hedges, and trees) located at a height of 92 m on the performance of a skygarden, in terms of occupants’ wind comfort. Computational fluid dynamics (CFD) simulations were carried out using the realisable k-epsilon method, where the vegetation was modelled as a porous zone with cooling capacity. The computational modelling of the high-rise building and vegetation were validated using previous works. The quality class (QC) of the Lawson comfort criteria was used for the evaluation of the wind comfort across the skygarden. The results indicate that, although the three wind buffers offer varying levels of wind reduction in the skygarden, the overall wind conditions generated are suitable for occupancy. Furthermore, vegetation is also able to offer slight temperature reductions in its wake. The right combination and dimension of these elements can greatly assist in generating aero-thermal comfort across skygardens.

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“…he concluded that the estimated wind loads on buildings by using CFD is comparable with the results by wind tunnel test and those by building design codes are more conservative than the CFD and wind tunnel test. [4] examined the building model of Commonwealth Advisory Aeronautical Council (CAARC) which has dimensions of (30mx45mx183m) in the wind analysis. Such work has been on the basis of numerical approach with focus on the equations of Reynolds Averaged Navier Stokes (RANS) as well as the turbulence model of Large Eddy Simulation (LES).…”

Section: Introductionmentioning

confidence: 99%

“…At the same time, the agreement deteriorated to some extent at sidewalls and enhanced at leeward wall. [3] examined the computational evaluations with regard to the wind loads on high as well as lo rise buildings. The model's dimensions have been (30.48mx45.72mx182.88m).…”

Section: Introductionmentioning

confidence: 99%

High-Rise Building Wind Analysis Using Computational Fluid Dynamics and Dynamic Analysis Using ETABS Program

Karrar¹

2020

IJETER

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Present paper is devoted to study wind load on tall building. Computational fluid dynamic (CFD) model was performed in three-dimensional (3D) commercial packages ANSYS (Fluid Fluent) 19.0. Utilizing finite volume technique to predict the wind load on tall building using specific boundary conditions. LES and standard k-ε turbulence model were used in the program to consider the wind turbulence. Current numerical approach was verified by comparison the drag coefficient and left coefficient results with experimental wind tunnel tests. This valid CFD model was applied in the simulation of the wind analysis for theoretical building, which is assumed located in Baghdad City, Iraq. It is connected that wind load results of CFD have a good agreement with the wind load results of building codes. This building was dynamically analyzed and good results were obtained.

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Computational Evaluation of Wind Loads on Low- and High- Rise Buildings

Cited by 8 publications

References 43 publications

Wind potential evaluation around isolated pitched roof buildings

Wind potential evaluation around isolated pitched roof buildings

Influence of Wind Buffers on the Aero-Thermal Performance of Skygardens

High-Rise Building Wind Analysis Using Computational Fluid Dynamics and Dynamic Analysis Using ETABS Program

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