Aerodynamics and aeroacoustics of turbulent flows over and past permeable rough surfaces

穿过可渗透粗糙表面的湍流的空气动力学和气动声学

• 批准号: EP/S013296/1
• 负责人: Bharathram Ganapathisubramani
• 金额: $ 116.03万
• 依托单位: University of Southampton
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2019
• 资助国家: 英国
• 起止时间: 2019 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FS013296%2F1
• 关键词: Aerodynamics; aeroacoustics; turbulent; flows; over

A variety of turbulent flows are either over porous surfaces or in the wake of bodies with surface porosity. Evolution, engineering design, manufacturing constraints and natural phenomena lead to rough and permeable boundaries in these porous surfaces (e.g. flow in heat exchangers, forest and urban canopies, bird feathers and river beds). The permeability and the roughness of a porous surface alters the turbulent boundary layer that develops over it and consequently the wake past an object with surface porosity. This entirely depends on the interaction between the external flow in the boundary layer over the roughness or the wake and the flow field within the porous media. Despite the wide-ranging impact and relevance, there is a clear lack of fundamental understanding and the scaling laws that relate the properties of porous media to the features of external flow. This points to the clear need for a systematic fundamental study aimed at understanding the flow mechanisms and the relationship between the properties of porous substrates, the flow field within the porous media and the structure of turbulent flow over and past them.In this ambitious collaborative project we combine the experimental expertise at Southampton and Bristol with the computational and modelling expertise at Cambridge and Southampton, to gain fundamental understanding of the turbulent boundary-layer and wake flow over and past permeable rough surfaces. This will be used to develop a fully-validated modelling framework that can predict the aerodynamics and aeroacoustics of turbulent flows interacting with realistic porous surfaces. Specifically, we will (1) examine the aerodynamic and aeroacoustic characteristics of wall-turbulence that develop over porous surfaces using high-fidelity experiments, (2) we will perform detailed DNS and LES of flow over porous surfaces using new in-house tools to understand the interaction between internal flow within the porous media and external flows, (3) use the experimental and numerical data to develop new models to represent the interaction between internal and external flow of porous surfaces in other lower fidelity simulations, (4) Utilise the new models in LES to predict the aerodynamics and aeroacoustics and (5) carry out measurements on the aerodynamics and aeroacoustics of flow over and past permeable rough surfaces over a large range of Reynolds numbers to further our understanding as well as to validate our new models. Ultimately, this will enable us and our industry partner to examine the utility of different realistic porous surfaces in flow/noise control.

各种湍流要么在多孔表面上，要么在具有表面孔隙的物体后面。进化、工程设计、制造限制和自然现象导致这些多孔表面出现粗糙且可渗透的边界（例如热交换器、森林和城市树冠、鸟类羽毛和河床中的流动）。多孔表面的渗透性和粗糙度改变了在其上形成的湍流边界层，从而改变了经过具有表面多孔性的物体的尾流。这完全取决于粗糙度或尾流上的边界层中的外部流与多孔介质内的流场之间的相互作用。尽管具有广泛的影响和相关性，但显然缺乏将多孔介质的特性与外部流动特征联系起来的基本理解和标度定律。这表明显然需要进行系统的基础研究，旨在了解流动机制以及多孔基质特性之间的关系、多孔介质内的流场以及它们上方和上方的湍流结构。在这个雄心勃勃的合作项目中，我们将南安普顿和布里斯托尔的实验专业知识与剑桥和南安普顿的计算和建模专业知识相结合，以获得对湍流边界层和尾流的基本了解 流过可渗透的粗糙表面。这将用于开发一个经过充分验证的建模框架，该框架可以预测与真实多孔表面相互作用的湍流的空气动力学和气动声学。具体来说，我们将 (1) 使用高保真实验检查多孔表面上产生的壁湍流的空气动力学和气动声学特性，(2) 我们将使用新的内部工具对多孔表面上的流动进行详细的 DNS 和 LES，以了解多孔介质内的内部流动和外部流动之间的相互作用，(3) 使用实验和数值数据开发新模型来表示内部流动和外部流动之间的相互作用 （4）利用 LES 中的新模型来预测空气动力学和气动声学，以及（5）在大范围雷诺数下对流经可渗透粗糙表面的空气动力学和气动声学进行测量，以进一步加深我们的理解并验证我们的新模型。最终，这将使我们和我们的行业合作伙伴能够检查不同的真实多孔表面在流量/噪声控制中的效用。

项目成果

A curvilinear lattice Boltzmann scheme for thermal flows

• DOI: 10.1016/j.matcom.2022.06.002
• 发表时间: 2022-06
• 期刊: Math. Comput. Simul.
• 作者: J. A. R. Barraza;R. Deiterding

Towards a generalised lattice Boltzmann method for aerodynamic simulations

用于空气动力学模拟的广义格子玻尔兹曼方法

• DOI: 10.1016/j.jocs.2020.101182
• 发表时间: 2020
• 期刊: Journal of Computational Science
• 影响因子: 3.3
• 作者: Reyes Barraza J

Handbook of Wind Energy Aerodynamics

风能空气动力学手册

• DOI: 10.1007/978-3-030-05455-7_74-1
• 发表时间: 2020
• 作者: Grondeau M

Development of a floating element photoelastic force balance

浮动元件光弹力天平的研制

• DOI: 10.1007/s00348-023-03664-1
• 发表时间: 2023
• 期刊: Experiments in Fluids
• 影响因子: 2.4
• 作者: McLaughlin B

Effects of porous substrates on the structure of turbulent boundary layers

多孔基质对湍流边界层结构的影响

• DOI: 10.1017/jfm.2024.45
• 发表时间: 2024
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Jaiswal P