Application of turbulent diffusivity models to point-source dispersion in outdoor and indoor flows

IF 2.6 3区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Heat and Fluid Flow Pub Date : 2025-04-24 DOI:10.1016/j.ijheatfluidflow.2025.109833

H.D. Lim , Christina Vanderwel

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引用次数: 0

Abstract

The modelling and prediction of scalar transport in turbulent flows is crucial for many environmental and industrial flows. We discuss the key findings of our experimental campaigns which focus on two relevant applications: the scalar dispersion of a ground-level point-source in (1) a smooth-wall turbulent boundary layer flow and (2) a supply-ventilated empty room model. For flows dominated by mean advection, including many outdoor flows, we show how the Gaussian Plume Model provides a good framework to describe the mean scalar field and discuss its limitations in assuming an isotropic and homogeneous turbulent diffusivity. For indoor flows, we explore the balance of the advective and turbulent fluxes and their dependence on the near-source flow field. We use our improved understanding on the scalar transport mechanism in these applications to assess the application of the Eddy Diffusion Model to predict indoor scalar dispersion, and highlight the importance of carefully defining what the turbulent diffusivity coefficient encompasses in different approaches.

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湍流扩散率模型在室内外流动点源色散中的应用

湍流中标量输运的建模和预测对许多环境和工业流动至关重要。我们讨论了我们的实验活动的主要发现，重点是两个相关的应用：地面点源在(1)光滑壁湍流边界层流动和(2)供应通风的空室模型中的标量色散。对于由平均平流主导的流动，包括许多室外流动，我们展示了高斯羽流模型如何提供一个很好的框架来描述平均标量场，并讨论了它在假设各向同性和均匀湍流扩散率方面的局限性。对于室内流动，我们探讨了平流通量和湍流通量的平衡及其对近源流场的依赖。我们利用对这些应用中标量输运机制的改进理解来评估涡流扩散模型在预测室内标量色散方面的应用，并强调仔细定义不同方法中湍流扩散系数所包含的内容的重要性。

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

International Journal of Heat and Fluid Flow 工程技术-工程：机械

CiteScore

5.00

自引率

7.70%

发文量

131

审稿时长

33 days

期刊介绍： The International Journal of Heat and Fluid Flow welcomes high-quality original contributions on experimental, computational, and physical aspects of convective heat transfer and fluid dynamics relevant to engineering or the environment, including multiphase and microscale flows. Papers reporting the application of these disciplines to design and development, with emphasis on new technological fields, are also welcomed. Some of these new fields include microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.