A study of gust wind speed using a novel unsteady Reynolds-Averaged Navier-Stokes model

IF 7.1 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Building and Environment Pub Date : 2024-11-17 DOI:10.1016/j.buildenv.2024.112323

Xiangyan Chen, Takeshi Ishihara

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Abstract

In this study, a novel unsteady Reynolds-Averaged Navier-Stokes (URANS) model is proposed in conjunction with a prespecified averaging time and turbulent inflow, and a new peak factor that considers the effect of averaging time used in URANS is derived to calculate gust wind speed. Firstly, the URANS incorporated with a prespecified averaging time and turbulent inflow is proposed to predict the time series of wind speed over flat terrain and investigate the variation of higher-order moments and zero-crossing rate at which the fluctuating wind speed changes algebraic sign with the averaging time. The predicted higher-order moments are less sensitive to the averaging time, but the predicted zero-crossing rate slightly decrease with increasing the averaging time due to the moving average effect. Secondly, a new peak factor is proposed to consider the averaging time. Finally, the gust wind speeds over flat terrain and around a single building predicted using the proposed URANS and the new peak factor based on the Hermite model are found to be in good agreement with the LES results, while those predicted by the conventional models deviate more from the LES results.

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利用新型非稳态雷诺平均纳维-斯托克斯模型对阵风风速的研究

本研究提出了一种新型非稳态雷诺平均纳维-斯托克斯（URANS）模型，该模型与预先指定的平均时间和湍流流入相结合，并推导出一种考虑了 URANS 中使用的平均时间影响的新峰值因子，用于计算阵风风速。首先，提出了结合预设平均时间和湍流流入的 URANS 预测平坦地形上的风速时间序列，并研究了波动风速随平均时间代数符号变化的高阶矩和过零率的变化。预测的高阶矩对平均时间的敏感度较低，但由于移动平均效应，预测的过零率随平均时间的增加而略有下降。其次，提出了一个新的峰值因子来考虑平均时间。最后，使用基于 Hermite 模型的 URANS 和新峰值因子预测的平坦地形上和单栋建筑物周围的阵风风速与 LES 结果非常吻合，而传统模型预测的阵风风速与 LES 结果偏差较大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Building and Environment 工程技术-工程：环境

CiteScore

12.50

自引率

23.00%

发文量

1130

审稿时长

27 days

期刊介绍： Building and Environment, an international journal, is dedicated to publishing original research papers, comprehensive review articles, editorials, and short communications in the fields of building science, urban physics, and human interaction with the indoor and outdoor built environment. The journal emphasizes innovative technologies and knowledge verified through measurement and analysis. It covers environmental performance across various spatial scales, from cities and communities to buildings and systems, fostering collaborative, multi-disciplinary research with broader significance.