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Article

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

1
Marine Environment and Engine System Department, National Maritime Research Institute, National Institute of Maritime, Port and Aviation Technology, Shinkawa 6-38-1, Mitaka-shi, Tokyo 181-0004, Japan
2
Maritime Risk Assessment Department, National Maritime Research Institute, National Institute of Maritime, Port and Aviation Technology, Shinkawa 6-38-1, Mitaka-shi, Tokyo 181-0004, Japan
*
Author to whom correspondence should be addressed.
Academic Editors: Laura A. Miller, Antonis Anastasiou, Amy Buchmann and Nicholas Battista
Fluids 2021, 6(7), 254; https://doi.org/10.3390/fluids6070254
Received: 15 June 2021 / Revised: 1 July 2021 / Accepted: 7 July 2021 / Published: 12 July 2021
(This article belongs to the Collection Feature Paper for Mathematical and Computational Fluid Mechanics)
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. View Full-Text
Keywords: mass-consistent flow (MASCON) model; diagnostic wind field model; algebraic models for flow fields mass-consistent flow (MASCON) model; diagnostic wind field model; algebraic models for flow fields
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MDPI and ACS Style

Asami, M.; Kimura, A.; Oka, H. Improvement of a Diagnostic Urban Wind Model for Flow Fields around a Single Rectangular Obstacle in Micrometeorology Simulation. Fluids 2021, 6, 254. https://doi.org/10.3390/fluids6070254

AMA Style

Asami M, Kimura A, Oka H. Improvement of a Diagnostic Urban Wind Model for Flow Fields around a Single Rectangular Obstacle in Micrometeorology Simulation. Fluids. 2021; 6(7):254. https://doi.org/10.3390/fluids6070254

Chicago/Turabian Style

Asami, Mitsufumi, Arata Kimura, and Hideyuki Oka. 2021. "Improvement of a Diagnostic Urban Wind Model for Flow Fields around a Single Rectangular Obstacle in Micrometeorology Simulation" Fluids 6, no. 7: 254. https://doi.org/10.3390/fluids6070254

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