A modified k-ω turbulence model for improved predictions of neutral atmospheric boundary layer flows

Saleh, Ali; Lakkis, Issam; Moukalled, F.

doi:10.1016/j.buildenv.2022.109495

Cited by 8 publications

(2 citation statements)

References 46 publications

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“…The dynamical component was constant, and the influence of the buoyancy force on the airflow was caused by the air density and pressure gradient. The airflow in the turbulent viscous model satisfied the continuity equation, while the momentum equation was represented by the Navier-Stokes equations [29]:…”

Section: Cfd Modelmentioning

confidence: 99%

Simulation Study on Natural Ventilation Performance in a Low-Carbon Large-Space Public Building in Hot-Summer and Cold-Winter Region of China

Liu,

Pan,

et al. 2023

Buildings

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Recently, climate governance has entered a new phase of accelerating decarbonization. In order to achieve low-carbon buildings, natural ventilation has been widely used as it requires no fan power. However, there are great challenges for achieving effective natural ventilation in large-space public buildings especially in areas characterized by hot-summer and cold-winter climatic regions, due to empirically unsuitable ambient temperatures and theoretically complex joint effect of wind pressure and thermal buoyancy. Therefore, this numerical study was conducted on the performance of a natural ventilation strategy in a large-space public building in a hot-summer and cold-winter region by using computational fluid dynamics (CFD) methods. Simulations were performed by applying FLUENT software for obtaining airflow distributions within and around a typical low-carbon public building. The temperature distribution in the atrium of the building was simulated particularly for analyzing the natural ventilation performance in a large-space area. Results demonstrated that thermal pressure was dominant for the large-space building in the case study. The average indoor airflow velocities on different floors ranged from 0.43 m/s to 0.47 m/s on the windward side which met indoor ventilation requirements. Most areas of wind velocities could meet ventilation requirements. The natural ventilation performance could be improved by increasing the relative height difference between the air inlets and air outlets. These findings could help provide references and solutions for realizing natural ventilation in low-carbon large-space public buildings in hot-summer and cold-winter regions.

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Section: Cfd Modelmentioning

confidence: 99%

Simulation Study on Natural Ventilation Performance in a Low-Carbon Large-Space Public Building in Hot-Summer and Cold-Winter Region of China

Liu,

Pan,

et al. 2023

Buildings

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show abstract

“…Numerous studies in uid dynamics have aimed to enhance comprehension and prediction capabilities. Saleh et al [16] addressed the consistency of a k − ω turbulence model for atmospheric boundary layer ows, enhancing it with additional source terms and rough wall functions. They compared diagnostic and prognostic approaches and found the prognostic method to be more suitable for complex geometries.…”

Section: Introductionmentioning

confidence: 99%

CFD Validation of Wall Laws in K-ω SST Model for Adverse Pressure Gradient-Free Downward Flow

Belhadad,

Kanna,

El Rhafiki

et al. 2023

E3S Web of Conf.

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This study introduces a validation investigation employing Computational Fluid Dynamics (CFD) to assess the utilization of the Consistent Wall Law (CWL) in tandem with the K-Shear Stress Transport (SST) turbulence model, specifically in scenarios characterized by downward flow without adverse pressure gradients. The precise prediction of turbulent flows near walls is of paramount significance in the realm of engineering applications. The CWL is meticulously designed to enhance the precision of near-wall turbulence modeling by ensuring a harmonious alignment between wall functions and the flow field. To gauge the performance of CWL in the challenging context of downward flows marked by adverse pressure gradients, we conducted numerical simulations using a commercial CFD solver. The results reveal a substantial improvement in agreement with experimental data, particularly in critical near-wall regions. CWL effectively showcases its prowess in managing adverse pressure gradients and offering precise predictions for wall-related parameters. Moreover, we executed a sensitivity analysis to explore the durability of CWL across various parameter variations, confirming its effectiveness and trustworthiness. This research significantly contributes to a more profound comprehension of turbulence modeling, thereby facilitating the generation of more accurate predictions in intricate flow scenarios that are pertinent to engineering applications.

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Developing modified k–ε turbulence models for neutral atmospheric boundary layer flow simulation using OpenFOAM

Wang,

Li,

Liu

et al. 2024

Build. Simul.

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A modified k-ω turbulence model for improved predictions of neutral atmospheric boundary layer flows

Cited by 8 publications

References 46 publications

Simulation Study on Natural Ventilation Performance in a Low-Carbon Large-Space Public Building in Hot-Summer and Cold-Winter Region of China

Simulation Study on Natural Ventilation Performance in a Low-Carbon Large-Space Public Building in Hot-Summer and Cold-Winter Region of China

CFD Validation of Wall Laws in K-ω SST Model for Adverse Pressure Gradient-Free Downward Flow

Developing modified k–ε turbulence models for neutral atmospheric boundary layer flow simulation using OpenFOAM

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