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Dynamical computational fluid dynamics modeling of the stochastic wind for application of urban studies

机译：随机风的动态计算流体动力学建模在城市研究中的应用

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摘要

For decades, the borders of building studies were restricted up to the exterior walls. With better understanding the side effect of urbanization on human health and with excessive progress in new investigation tools, the area of building studies were enlarged to neighborhood environment where mass and air transport vividly interact with the buildings. Unlike the indoor studies, one can emphasize the significance of the stochastic wind in outdoor studies. Many experimental and simulation research have been conducted to verify the contribution of the wind velocity over/within street canyons/buildings. These works were mainly designed to observe the relations between wind flow and natural ventilation, pollution dispersion, pedestrian thermal/wind comfort, and drag resistance of the buildings. All these efforts continuously proved the significance of vortices caused by upstream wind as they interact on physical phenomena within the street canyons. However, the main drawback of these studies is not attributed to the extracted results, but the way in which wind, an inherently transient and stochastic phenomenon, is presented by a steady state consideration as applied through the boundary conditions. For example, upstream wind in terms of direction and magnitude is widely considered as a constant and steady state profile induced through the street canyons. However, due to the transient and stochastic nature of encountered wind in the urban environment, these assumptions fail to capture the physics of the problems. Therefore, the main point of concern in street canyon modeling should be described as constant and steady state reflection of stochastic and transient phenomena through the boundary conditions. Although there are existing studies related to the application of transient boundary conditions, a practical procedure to model the dynamic and stochastic behavior of wind direction is barely addressed in literature. In light of the lack of stochastic wind modeling, this study intends to introduce for the first time an approach in order to generate dynamic wind. This is followed by a brief discussion of existing approaches in urban-scale wind modeling and their major shortcomings. For this purpose, a computational Fluid dynamics (CFD) model is developed considering a novel cylindrical computational domaia An analytical and a parametric study have been also conducted to obtain suitable sizes for the domain geometries. The advantages of the proposed model comDarine to the traditional aDDroaches are deDicted usine a case studv of arrav of cuboids.
机译：几十年来，建筑研究的边界一直局限于外墙。在更好地了解了城市化对人类健康的副作用以及新的调查工具取得了巨大进展之后，建筑研究的领域扩大到了周围环境，在该环境中，大众与空中交通与建筑物生动地相互作用。与室内研究不同，人们可以强调随机风在室外研究中的重要性。为了验证风速对街道峡谷/建筑物的影响，已经进行了许多实验和模拟研究。这些工作的主要目的是观察风与自然通风，污染扩散，行人的热/风舒适度以及建筑物的阻力之间的关系。所有这些努力不断证明了上游风引起的涡旋的重要性，因为它们与街道峡谷内的物理现象相互作用。但是，这些研究的主要缺点不是归因于提取的结果，而是通过边界条件施加的稳态考虑来呈现风（一种固有的瞬态和随机现象）的方式。例如，就方向和大小而言，上游风被广泛认为是通过街道峡谷引起的恒定和稳态分布。但是，由于在城市环境中遇到的风的瞬变和随机性质，这些假设无法反映问题的物理性质。因此，应将街道峡谷建模的主要关注点描述为通过边界条件对随机和瞬态现象的恒定和稳态反射。尽管已有关于瞬态边界条件应用的研究，但文献中几乎没有涉及到模拟风向动态和随机行为的实用程序。鉴于缺乏随机风模型，本研究旨在首次引入一种生成动态风的方法。接下来是对城市规模风模型的现有方法及其主要缺点的简要讨论。为此，考虑了新颖的圆柱计算理论，开发了计算流体动力学（CFD）模型。还进行了分析和参数研究，以获得适用于域几何的尺寸。拟议的模型组合与传统方法的优点是专门用于长方体的案例研究。

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  • 来源
    《Building and Environment》 |2013年第12期|161-170|共10页
  • 作者

    Parham A. Mirzaei; Jan Carmeliet;

  • 作者单位

    Laboratory for Building Science and Technology, Swiss Federal Laboratories for Materials Testing and Research (Empa), Ueberlandstrasse 129, 8600 Dilbendorf, Switzerland,Swiss Federal Institute of Technology Zurich (ETHZ), Wolfgang-Pauli-Strasse 15, 8093 Zurich, Switzerland,The University of Nottingham, Room A2a, Lenton Firs House, University Park, Architecture and Built Environment Department, Nottingham, NC7 2RD, UK;

    Laboratory for Building Science and Technology, Swiss Federal Laboratories for Materials Testing and Research (Empa), Ueberlandstrasse 129, 8600 Dilbendorf, Switzerland,Swiss Federal Institute of Technology Zurich (ETHZ), Wolfgang-Pauli-Strasse 15, 8093 Zurich, Switzerland;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Street canyon; Wind; CFD; Urban-scale; Cylindrical domain;

    机译：街道峡谷;风;差价合约城市规模;圆柱域;

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