Numerical and experimental investigation of utilizing the porous media model for windbreaks CFD simulation

Mahgoub, Ahmed Osama; Ghаni, Sаud

doi:10.1016/j.scs.2020.102648

Cited by 29 publications

(9 citation statements)

References 39 publications

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“…There are examples of full-scale wind tests [23,26,28], but project/site-specific tests are usually impractical and costly. Hence, with the increase in computational power today, CFD analysis is becoming increasingly popular [29]. The different computational approaches used to simulate the wind could be divided into mesh-based methods, which are most frequently used, and mesh-free/particle-based methods, such as SPH-smoothed particle hydrodynamics [30][31][32][33].…”

Section: Windbreak Performance Evaluation Methodsmentioning

confidence: 99%

“…Furthermore, Liu et al [35] bring up multiple issues with scaling when it comes to determining if the experimental results from windbreak research are directly applicable to actual conditions-both with the scaling of the structure itself and the implications that this has for the calculations, as well as with representing the natural wind in a simulation. Others have also raised concerns about the accuracy of scaled models for wind analysis [29,37,38]. Thus, the question of how accurate the models are should always be raised for each specific case.…”

Section: Windbreak Performance Evaluation Methodsmentioning

confidence: 99%

“…Thus, the question of how accurate the models are should always be raised for each specific case. Mahgoub and Ghani [29] point out that CFD simulations can be carried out on a full scale and thus address some of the difficulties with scaling. However, the complex geometry of porous windbreaks in general and knitted or textile windbreaks in particular results in high computational costs.…”

Section: Windbreak Performance Evaluation Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Architectural Knitted Windbreaks for Improved Wind Comfort in the City: A Wind Tunnel Study of Custom-Designed Porous Textile Screens

et al. 2022

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There is a need to shield from the wind to improve pedestrian comfort in urban environments. Perforated windbreaks, such as fences, vegetation or textile nets, have proven to be an efficient solution, whereas knitted textiles have not yet been explored. The purpose of this study was to evaluate the capacity of knitted textile windbreaks to reduce wind velocities, to inform further research and promote wider architectural applications. Five custom-knitted textile prototypes, representing fragments of textile windbreaks, were tested in a wind tunnel and compared against a perforated and a nonperforated solid board. Forces on the models, as well as upstream and downstream velocities, were measured. The results indicate that the optimal optical porosity of knitted windbreaks should be around 10%, which differs from the porosity for perforated windbreaks recommended by prior studies. Moreover, it was observed that a textile windbreak knitted using the drop-stitch technique efficiently reduces the wind, while not generating a large drag force. Furthermore, the drag coefficient for the knitted windbreak is reduced with increased windspeed. With this, the presented study demonstrates that knitted structures exposed to wind influence have the functional potential of becoming efficient windbreaks, thus improving wind comfort and aesthetic user experience in the urban space.

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Section: Windbreak Performance Evaluation Methodsmentioning

confidence: 99%

Section: Windbreak Performance Evaluation Methodsmentioning

confidence: 99%

Section: Windbreak Performance Evaluation Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Architectural Knitted Windbreaks for Improved Wind Comfort in the City: A Wind Tunnel Study of Custom-Designed Porous Textile Screens

et al. 2022

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“…The bulk-storage area was sparsely occupied, with six workers, and the individual ventilation rate was 0.43 m 3 /s/person (910 CFM/person), an order of magnitude higher than the required minimum ventilation rate of 0.005 m 3 /s/person (10 CFM/person) [39]. Storage racks were modeled using porous-media models [40][41][42]. Nelson [43] developed a server-rack porous media, and Ambaw [44] modeled a fruit box using porous media.…”

Section: Model Setups -Warehouse Modelmentioning

confidence: 99%

Comparing airborne infectious aerosol exposures in sparsely occupied large spaces utilizing large-diameter ceiling fans

Yang

Wang

Raftery

et al. 2023

Building and Environment

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“…However, even though the wind velocity profiles around nets with relatively large porosities were reproduced well compared with the experimental results, there was a difference between the numerical and experimental values for nets with relatively small porosities. On the other hand, Mahgoub and Ghani [21] calculated the flow fields around windbreaks using a three-dimensional porous media model in which the tangential resistance was considered. However, the thickness of the windbreak used by them was significantly larger than those of the gauze used in this study.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Airborne Salt Particle Behavior in Dry Gauze Method Using Porous Media Model

Tsubokura

Noguchi

Yagi

2021

Journal of Applied Mechanics

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Airborne salt accelerates the corrosion of steel materials and, thus, must be quantitatively evaluated for the management of steel structures. In Japan, the dry gauze method, which uses a gauze embedded in a wooden frame, is often used to evaluate the amount of airborne salt. However, its collection efficiency for salt particles has not been verified owing to the complex airflows around the device. Therefore, as a first step to clarify the collection efficiency, the authors simulated the flow field around the collection device using computational fluid dynamics. In this study, the gauze was modeled as a porous medium to reduce the computational costs. Wind tunnel tests were performed to obtain the pressure loss coefficients of the gauze, which is necessary for the porous media method. Subsequently, particle tracking was performed in the calculated flow field, and the collection efficiency was evaluated under the condition of a filtration efficiency of 100%. The flow fields around the device were accurately reproduced using the porous media model, which considered both the tangential and normal resistances of the gauze. This result suggests that the tangential resistance must be considered in the porous media model when the porosity of an object is small, even if the thickness is small. The dependence of collection efficiency on wind speed and direction was quantitatively evaluated. The results showed that the collection efficiency was greatly affected by the complicated flow field around the device due to the combination of the gauze and wooden frame.

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Numerical and experimental investigation of utilizing the porous media model for windbreaks CFD simulation

Cited by 29 publications

References 39 publications

Architectural Knitted Windbreaks for Improved Wind Comfort in the City: A Wind Tunnel Study of Custom-Designed Porous Textile Screens

Architectural Knitted Windbreaks for Improved Wind Comfort in the City: A Wind Tunnel Study of Custom-Designed Porous Textile Screens

Comparing airborne infectious aerosol exposures in sparsely occupied large spaces utilizing large-diameter ceiling fans

Numerical Simulation of Airborne Salt Particle Behavior in Dry Gauze Method Using Porous Media Model

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