Prediction of Wind Flow around High-Rise Buildings Using RANS Models

Behrouzi, Fatemeh; Sidik, Nor Azwadi Che; Malik, Adi Maimun Abdul; Nakisa, Mehdi

doi:10.4028/www.scientific.net/amm.554.724

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…Tan and Li simulated the wind effects on a super high-rise TV tower and found that the Realizable K-Epsilon (RKE) model could come up with more accurate results in terms of mean pressure coefficients and streamlines than the Standard K-Epsilon (SKE) and RNG K-Epsilon models [20]. Behrouzi et al presented two cases of wind flow around high-rise buildings and concluded that the RNG K-Epsilon model and the RKE model overpredicted the reattachment length behind the buildings [21]. Likewise, other scholars also pointed out the inaccuracy of using revised k-epsilon models in reproducing the weak-wind area and the reattachment length behind the building [22][23][24][25].The Reynolds Stress Model (RSM) with modified inlet atmosphere boundary conditions, as proposed by Zhang et al, was able to better simulate the wind flow around high-rise buildings [26].…”

Section: Introductionmentioning

confidence: 99%

Study on Accuracy of CFD Simulations of Wind Environment around High-Rise Buildings: A Comparative Study of k-ε Turbulence Models Based on Polyhedral Meshes and Wind Tunnel Experiments

et al. 2022

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It is important to create a comfortable wind environment around high-rise buildings for outdoor activities. To predict the wind environment, Computational Fluid Dynamics (CFD) has been widely used by designers and engineers. However, the simulation results of different CFD turbulence models might significantly vary. This paper researched the wind environment around a typical high-rise building and verified the accuracy of the CFD simulations based on polyhedral meshes. The differences between the simulation results of the k-ε turbulence models and those of the wind tunnel experiments were compared from the perspectives of wind speed and turbulence energy. The results show that the modified k-ε models could still not perfectly match the wind tunnel experiment results. Specifically, in the low-wind-speed areas, the simulation results of the Realizable Two-Layer K-Epsilon (RTLKE) model were the closest to the experimental results of the wind tunnels, while in the high-wind-speed areas the simulation results of the Standard Two-Layer K-Epsilon (STLKE) model were the closest to the experimental results of the wind tunnels. Therefore, it is recommended that these two k-ε turbulence models are applied under different conditions—the RTLKE model should be used to simulate low-wind areas around high-rise buildings (e.g., defining the size of the static-wind area around high-rise buildings, predicting the diffusion time of pollutants around high-rise buildings, etc.); STLKE should be used to simulate high-wind-speed areas around high-rise buildings (e.g., the high speed wind area around high-rise buildings during a typhoon, the maximum wind speed area around high-rise buildings, etc.). It is expected that findings from this research study supplement some existing high-rise building design guidance.

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Section: Introductionmentioning

confidence: 99%

Study on Accuracy of CFD Simulations of Wind Environment around High-Rise Buildings: A Comparative Study of k-ε Turbulence Models Based on Polyhedral Meshes and Wind Tunnel Experiments

et al. 2022

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“…Artificial facilities, such as buildings and solar panels, have significant influences on the atmospheric boundary-layer flow, but most simulations of the flow field around obstacles only model the flow field around isolated structures rather than groups of obstacles (Lien et al, 2004). For example, many scholars, based on the Reynolds-averaged Navier-Stokes (RANS) method, calculated the flow field around an isolated building (Montazeri and Blocken, 2013;Blocken, 2014;Chiu et al, 2017) and around two interactive buildings (Ramponi and Blocken, 2012;Behrouzi et al, 2014). Hunter et al (1990) calculated the three-dimension (3-D) characteristics of the flow field within an urban canyon based on the turbulence model.…”

Section: Introductionmentioning

confidence: 99%

Optimization designs of artificial facilities in deserts based on computational simulation

2021

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Sediment transport of sand particles by wind is one of the main processes leading to desertification in arid regions, which severely impairs the ability of mankind to produce and live by drifting sand into settlements. Optimization designs of artificial facilities have lately attracted extensive interest for human settlement systems in deserts because of their acceptable protection effect, convenience of implementation, and low material cost. However, the complexity of a settlement system poses challenges concerning finding suitable materials, artificial facilities, and optimization designs for sand deposition protection. In an effort to overcome these challenges, we propose a settlement system built with brick, solar panel, and building arrays to meet the basic needs of human settlements in arid regions while preventing wind-sand disasters. The wind flow and movement characteristics of sand particles in the brick, panel, and building arrays were calculated using computational fluid dynamics and discrete phase model. The performance of three types of arrays in wind-sand flow in terms of decreasing the wind velocity and sandparticle invasion distance was evaluated. The results show that the wind velocity near the surface and the sand invasion distance were significantly decreased in the space between the brick arrays through properly selected vertical size and interspaces, indicating that the brick arrays have an impressive sand fixing and blocking performance; their effective protection distance was 3-4 m. The building arrays increased the nearsurface wind velocity among buildings, resulting in less deposition of sand particles. The solar panel arrays were similar to the building arrays in most cases, but the deposition of sand particles on solar panels exerted a negative effect on energy utilization efficiency. Therefore, taking the optimal configuration of the settlement system into consideration, this study concludes that (1) brick arrays, which were proven effective in preventing sand particles, must be arranged in an upwind area; (2) solar panel arrays could accelerate the wind flow, so they are best to be arranged at the place where sand particles deposited easily; and (3) building arrays present a better arrangement in downwind areas.

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CFD Analysis for a Wind Tunnel Experiment for Investigating the Performance of Turbulence Models

Najian,

Goudarzi

2023

ASCE Inspire 2023

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Prediction of Wind Flow around High-Rise Buildings Using RANS Models

Cited by 5 publications

References 3 publications

Study on Accuracy of CFD Simulations of Wind Environment around High-Rise Buildings: A Comparative Study of k-ε Turbulence Models Based on Polyhedral Meshes and Wind Tunnel Experiments

Study on Accuracy of CFD Simulations of Wind Environment around High-Rise Buildings: A Comparative Study of k-ε Turbulence Models Based on Polyhedral Meshes and Wind Tunnel Experiments

Optimization designs of artificial facilities in deserts based on computational simulation

CFD Analysis for a Wind Tunnel Experiment for Investigating the Performance of Turbulence Models

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