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Computational Toolbox for Fluid-Membrane Interaction with Applications to Micro Air Vehicles and Insect Flight

流体膜相互作用计算工具箱及其在微型飞行器和昆虫飞行中的应用

基本信息

批准号：
EP/G008531/1
负责人：
Fehmi Cirak
金额：
$ 49.69万
依托单位：
University of Cambridge
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FG008531%2F1
关键词：
Computational Toolbox Fluid Membrane Interaction

项目摘要

This research addresses the need for computational tools and techniques for the aeroelastic analysis of fluid-membrane systems. The particular focus is on development of a comprehensive computational toolbox for analysing the dynamics of fluids and embedded structures with the goal of obtaining high-fidelity predictions for aerodynamic design parameters, like drag and lift, and structural design parameters, like maximum stress and deflection. Although the equations for viscous, incompressible fluid flow and membrane dynamics are straightforward and well known, it is still challenging, if not impossible, to perform fluid and membrane coupled computations in the presence of large deformations. Besides fundamental differences in the mathematical structure of fluid and solid equations, progress is hampered by the vast disparity of the physical length and time scales involved. To address the first issue, the computational toolbox will include a mathematically rigorous and algorithmically robust formulation for representing the coupled dynamics of a fluid with an immersed membrane. For resolving the length and time scales a two-pronged approach will be followed. First, the developed techniques will be scalable to large system-level, three-dimensional simulations, with up to billions of unknowns, which will be achieved through systematic utilization of high-performance computing platforms. Second, the influence of the unresolvable sub-grid scales on the large-scale motions of the fluid flow will be explicitly modelled with a multi-scale method. The design of flapping wing micro air vehicles (MAVs) has been chosen as the driving application for this research. Conventional aerodynamic methods are either inapplicable or too crude for the design space exploration of bio-inspired MAVs with highly compliant flapping wings. Therefore, further MAV development requires new computational tools for the aeroelastic analysis of fluid-membrane systems. In return, the MAVs will provide an unrivalled testbed for a comprehensive experimental validation programme for the computational predictions. Flapping wing MAVs are nevertheless poor imitations of the natural millimetre and centimetre scale flyers - the insects. A combination of computations and free flight experiments will therefore be conducted towards identifying the key factors in natural flyers excellence. The highly scalable and validated computational toolbox developed during the project will be made available as open source software to the scientific community. Therefore, it is expected that the outcome of this project will be relevant far beyond the design of MAVs and the study of insect flight.

这项研究解决了对流体-膜系统气动弹性分析的计算工具和技术的需求。重点是开发一个全面的计算工具箱，用于分析流体和嵌入结构的动力学，目标是获得对气动设计参数(如阻力和升力)以及结构设计参数(如最大应力和挠度)的高保真预测。尽管粘性、不可压缩流体流动和膜动力学的方程是直截了当和众所周知的，但在存在大变形的情况下进行流膜耦合计算仍然是具有挑战性的，如果不是不可能的话。除了流体和固体方程的数学结构上的根本差异外，进展还受到所涉及的物理长度和时间尺度的巨大差异的阻碍。为了解决第一个问题，计算工具箱将包括一个数学上严格和算法上稳健的公式，用于表示流体与浸没的膜的耦合动力学。为了解决长度和时间尺度问题，将采取双管齐下的办法。首先，开发的技术将可扩展到大型系统级的三维模拟，具有多达数十亿个未知数，这将通过系统地利用高性能计算平台来实现。其次，不可分辨的亚网格尺度对流体大尺度运动的影响将用多尺度方法显式模拟。本研究选择扑翼微型飞行器(MAV)的设计作为驱动应用。传统的空气动力学方法对于具有高度柔顺扑翼的仿生小牛的设计空间探索要么不适用，要么过于粗糙。因此，MAV的进一步发展需要新的计算工具来分析流体-膜系统的气动弹性。作为回报，MAV将为计算预测的全面实验验证计划提供无与伦比的试验台。然而，扑翼小牛是对自然毫米和厘米级飞虫--昆虫的拙劣模仿。因此，将进行计算和自由飞行实验相结合的方法，以确定自然飞行优秀的关键因素。在项目期间开发的高度可扩展和经过验证的计算工具箱将作为开放源码软件提供给科学界。因此，预计该项目的结果将远远超出MAV的设计和昆虫飞行的研究。