Fundamental Understanding of Turbulent Flow over Fluid-Saturated Complex Porous Media

对流体饱和复杂多孔介质上湍流的基本理解

• 批准号: EP/W033542/1
• 负责人: Yasser Mahmoudi Larimi
• 金额: $ 64.89万
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FW033542%2F1
• 关键词: Fundamental; Understanding; Turbulent; Flow; over

Understanding of turbulent flow characteristics over porous media is central for unravelling the physics underlying the natural phenomena (e.g., soil evaporation, forest and urban canopies, bird feathers and river beds) as well as man-made technologies including energy storage, flow/noise control, electronics cooling, packed bed nuclear reactors and metal foam heat exchangers. In these natural and engineering applications, a step change in the fundamental understanding of turbulent flow and heat transfer in composite porous-fluid systems, which consists of a fluid-saturated porous medium and a flow passing over it, is crucial for characterisation and diagnostic analysis of such systems. Flow and thermal characteristics of the composite systems depends heavily on the interaction between the external flow, downstream wake, and the fluid flow in the porous media. Despite the clear relevance and wide-ranging impact of this problem in nature and engineering, there is a clear lack of fundamental understanding of the flow and thermal characteristics of turbulent flow in composite porous-fluid systems, and the models that relate the exchange of the flow and thermal properties between the porous region and the external fluid passing over it. In particular, the characterisation of the velocity and thermal boundary layers over the porous media, understanding the mechanisms governing flow passage through porous media, possible flow leakage and its interaction with the wake flow, as well as their relationship with the geometric characteristics of porous media, have remained major scientific challenges. This highlights the clear need for a systematic fundamental study aimed at understanding the flow and thermal characteristics of turbulent flow over realistic porous media and the relationship between the properties of porous substrate, the flow within the porous media and the structure of turbulent flow over and past the porous region.In this ambitious collaborative project, we combine the computational and modelling expertise at the University of Manchester and Southampton with the experimental expertise at the University of Bristol, to gain fundamental understanding of the turbulent boundary layer, flow leakage and downstream wake on the flow and thermal characteristics of fluid-saturated porous media. This will be used to establish evidence-based interface flow and thermal models, representing the exchange of flow properties between two regions through the interface. These models will then be used to develop a design tool based on the volume-averaged approach, which is a popular low-cost engineering approach for studying transport in porous media, for real-scale applications where the pore-scale analysis in computationally prohibitive.

了解多孔介质的湍流特征对于揭示自然现象的物理（例如，蒸发，蒸发，森林和城市檐篷，鸟羽毛和河床）以及人为的技术，包括能源，流量/噪音控制，电子控制，电子机器冷却，包装床核反应器和金属泡沫热剂。在这些自然和工程应用中，对复合多孔流体系统中的湍流和传热的基本了解，该系统由流体饱和的多孔培养基及其流过的流量组成，对于对此类系统的表征和诊断分析至关重要。复合系统的流量和热特性在很大程度上取决于外部流动，下游唤醒和多孔介质中流体流量之间的相互作用。尽管该问题在性质和工程中具有明显的相关性和广泛的影响，但显然缺乏对复合多孔流体系统中湍流流动流的流量和热特性的基本了解，以及与多孔区域之间的流动和热特性交换的模型以及外部流体之间的交换。特别是，在多孔介质上的速度和热边界层的表征，了解管理流经多孔介质的流动，可能的流量泄漏及其与尾流的相互作用以及它们与多孔培养基的地球特征的相互作用的机制。这突显了对系统基础研究的明确需求，旨在了解逼真的多孔媒体上的湍流流动的流量和热特征，以及多孔底物的性能，多孔媒体内的流动，多孔媒体内的流量以及湍流区域的湍流结构，超过多孔的多孔区域。布里斯托尔（Bristol），为了获得对湍流边界层的基本理解，流动泄漏和下游唤醒流体饱和多孔介质的流量和热特性。这将用于建立基于证据的界面流和热模型，代表两个区域之间通过界面之间的流量交换。然后，这些模型将用于基于体积平均方法的设计工具，该方法是一种流行的低成本工程方法，用于研究多孔介质中的运输，用于在计算范围内的孔隙尺度分析。

项目成果

A divide-and-conquer machine learning approach for modeling turbulent flows

• DOI: 10.1063/5.0149750
• 发表时间: 2023-05
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: Anthony Man;M. Jadidi;A. Keshmiri;Hujun Yin;Y. Mahmoudi

Physics-informed neural networks for heat transfer prediction in two-phase flows

• DOI: 10.1016/j.ijheatmasstransfer.2023.125089
• 发表时间: 2024
• 期刊: International Journal of Heat and Mass Transfer
• 影响因子: 5.2
• 作者: Darioush Jalili;Seohee Jang;M. Jadidi;Giovanni Giustini;A. Keshmiri;Y. Mahmoudi

On the mechanism of turbulent heat transfer in composite porous-fluid systems with finite length porous blocks: Effect of porosity and Reynolds number

有限长度多孔块复合多孔流体系统中的湍流传热机理：孔隙率和雷诺数的影响

• DOI: 10.1016/j.ijheatmasstransfer.2023.124006
• 发表时间: 2023
• 期刊: International Journal of Heat and Mass Transfer
• 影响因子: 5.2
• 作者: Jadidi M