Comprehensive Evaluation of Fast-Response, Reynolds-Averaged Navier–Stokes, and Large-Eddy Simulation Methods Against High-Spatial-Resolution Wind-Tunnel Data in Step-Down Street Canyons

Hayati, Arash Nemati; Stoll, Rob; Kim, J. J.; Harman, Todd; Nelson, Matthew A.; Brown, Michael J.; Pardyjak, Eric R.

doi:10.1007/s10546-017-0245-2

Cited by 19 publications

(9 citation statements)

References 64 publications

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“…For instance the study presented by Lübcke et al [47] showed that LES is approximately 20 times more computationally expensive than RANS. This observation in also confirmed by work of Hayati et al [48] which showed that LES approach is at least 120 times more expensive than RANS event thought the LES simulations were performed using 480 CPUs, while the RANS computations were conducted using 4 cores. In the work presented by Rodi [49] the large increase in computing time when switching from RANS to LES (even about 36 times) was also reported.…”

Section: Introductionsupporting

confidence: 80%

Wind-induced pressure loads on buildings in tandem arrangement in urban environment

Gnatowska

2018

Environ Fluid Mech

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The wind-induced pressure loads are affected by a broad spectrum of elements involving flow conditions, buildings geometry, or neighbourhoods. Computational fluid dynamics is a useful device used to estimate pressure distribution. The aim of this research is a detailed assessment of the use of numerical calculation (RANS) for forecasting wind-induced pressure loads on buildings arranged in tandem located in the built-up area. The approach of this work was to determine the pressure loads on the walls of rectangular objects, which were the simplified models of buildings located in the ground-level zone. The important task was to estimate the impact of distance between obstacles on the pressure loads on their surfaces. It was found that when changing the distance between buildings the pressure distribution on the downstream object varies significantly. Additionally, for defined geometrical parameters, the influence of inflow angle was analysed. The obtained results demonstrate and confirm that RANS numerical calculations, in spite of all their limits, can accurately modeling the pressure distribution on buildings.

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Section: Introductionsupporting

confidence: 80%

Wind-induced pressure loads on buildings in tandem arrangement in urban environment

Gnatowska

2018

Environ Fluid Mech

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“…Instead, flow velocities are calculated from the continuity equation in such a way that the mass conservation should be met by a variational approach. The MASCON field model is a mass-consistent model that is often used for predicting the flow fields in complex three-dimensional terrain [1][2][3]. Reasonable results can be expected from the MASCON field model given an initial flow field.…”

Section: The Mascon Field Modelmentioning

confidence: 99%

“…A diagnostic mass-consistent flow (MASCON) field model is often used to predict the flow field in complex terrains [1][2][3]. The characteristics of the model are that reasonable results can be expected by using an adequate initial flow field, such as observed wind data in the model, and that the computational cost is small compared with CFD models.…”

Section: Introductionmentioning

confidence: 99%

“…The characteristics of the model are that reasonable results can be expected by using an adequate initial flow field, such as observed wind data in the model, and that the computational cost is small compared with CFD models. In the case of the dynamics of dominant flow topological features in the street canyon, the MASCON field model completed the calculation in only 5 s using a one-core processor, whereas the Reynolds average Navier-Stokes equation (RANS) model required 5 h of execution time even with four-core processors [3]. Owing to these features, the MASCON field model has been used primarily to estimate meteorology-related flow fields.…”

Section: Introductionmentioning

confidence: 99%

“…Gowardhan et al improved the parameterizations that produce upwind recirculation zones and rooftop flow [2]. Hayati et al comprehensively evaluated their MASCON field model and two CFD simulations with different turbulence modeling approaches, Reynolds-averaged Navier-Stokes simulation (RANS) and largeeddy simulation (LES), against high-spatial-resolution wind-tunnel velocity data [3]. They also introduced a parametrization for sidewall-wake recirculation zones around surfacemounted rectangular obstacles [3].…”

Section: Introductionmentioning

confidence: 99%

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Improvement of a Diagnostic Urban Wind Model for Flow Fields around a Single Rectangular Obstacle in Micrometeorology Simulation

Asami

Kimura

Oka

2021

Fluids

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In general, computational fluid dynamics (CFD) models incur high computational costs when dealing with realistic and complicated flows. In contrast, the mass-consistent flow (MASCON) field model provides a three-dimensional flow field at reasonable computational cost. Unfortunately, some weaknesses in simulating the flow of the wake zone exist because the momentum equations are not considered in the MASCON field model. In the present study, a new set of improved algebraic models to provide initial flow fields for the MASCON field model are proposed to overcome these weaknesses by considering the effect of momentum diffusion in the wake zone. Specifically, these models for the wake region are developed on the basis of the wake models used in well-recognized Gaussian plume models, ADMS-build and PRIME. The MASCON fields provided by the new set of wake zone models are evaluated against wind-tunnel experimental data on flow around a wall-mounted rectangular obstacle. Each MASCON field is compared with the experimental results, focusing on the positions of the vortex core and saddle points of the vortex formed in the near-wake zone and the vertical velocity distribution in the far-wake zone. The set of wake zone models developed in the present study better reproduce the experimental results in both the wake zones compared to the previously proposed models. In particular, the complicated recirculation flow which is formed by the union of the sidewall recirculation zone and the near-wake zone is reproduced by the present wake zone model using the PRIME model that includes the parameterization of the sidewall recirculation zones.

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Mean and Turbulent Flow Statistics in a Trellised Agricultural Canopy

Miller

Stoll

Mahaffee

et al. 2017

Boundary-Layer Meteorol

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Comprehensive Evaluation of Fast-Response, Reynolds-Averaged Navier–Stokes, and Large-Eddy Simulation Methods Against High-Spatial-Resolution Wind-Tunnel Data in Step-Down Street Canyons

Cited by 19 publications

References 64 publications

Wind-induced pressure loads on buildings in tandem arrangement in urban environment

Wind-induced pressure loads on buildings in tandem arrangement in urban environment

Improvement of a Diagnostic Urban Wind Model for Flow Fields around a Single Rectangular Obstacle in Micrometeorology Simulation

Mean and Turbulent Flow Statistics in a Trellised Agricultural Canopy

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