AIM (Advanced Instability Methods) for industry

工业用 AIM（高级不稳定性方法）

• 批准号: EP/H050310/1
• 负责人: Matthew Juniper
• 金额: $ 43.06万
• 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: 2011
• 资助国家: 英国
• 起止时间: 2011 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FH050310%2F1
• 关键词: AIM; Advanced; Instability; Methods; industry

In the last ten years there has been a surge of interest in non-modal analysis applied to standard problems in fundamental fluid mechanics. Even in simple flows, the behaviour predicted by these non-modal analyses can be completely different from - and far more accurate than - that predicted by conventional analyses, particularly for the types of flows found in industrial situations.The successful application of non-modal analysis to standard problems sets the scene for step changes in engineering practice. Nevertheless, some very significant challenges must be overcome. Firstly, the standard approach cannot handle the non-linear problems often found in engineering. Secondly, the standard approach is computationally expensive and cannot handle problems with many degrees of freedom. Thirdly, the standard approach deals with simple measures, such as kinetic energy density, while other measures are usually more pertinent for industrial situations. Encouragingly, applied mathematicians and engineers have made significant progress in all of these areas. This progress has revealed that a generalized formulation of the problem in terms of constrained optimization and variational methods, adapting and applying methods from the control and computational communities, will bridge the gap between standard flows and engineering problems.Our vision is that future generations of engineering Computational Fluid Dynamics (CFD) tools will contain modules that can perform non-modal analysis. If and when such analyses can be made practicable they are certain to change the way that engineers design fluid mechanical systems, such as combustion chambers, turbine blades, reaction chambers and ink jet printers. Furthermore, they can readily deal with transient effects and non-periodic time-varying base flows, which are often particularly relevant in engineering situations.This research will benefit UK industries that rely on the modelling and control of fluid mechanics and thermoacoustics. For example, the pharmaceutical industry will benefit from a better understanding of transition to turbulence and relaminarization in physiological flows, which is important for the application of drugs via the nose and upper airways; The gas turbine industry will benefit from being able to perform instant sensitivity analyses of their fuel injectors and to combine this with greater understanding of the thermo-acoustics that leads to combustion instability; and the wind turbine industry will benefit from an improved prediction of the sensitivity of an aerofoil to turbulence transition and results of exposure to a gust or to the wake of the preceding aerofoil.The investigators in this proposal are all founder members of the EPSRC-funded Advanced Instability Methods (AIM) Network, which was set up in January 2009 to explore the relevance of non-normal analysis to industrial problems. Through masterclasses and workshops in academia and industry and an increasing number of web-based resources, the network provides a route for dissemination and exploitation of this research.In summary, the objectives of this proposal are to bridge the gap between fundamental work and engineering practice, to embed these techniques in the engineering design cycle and to reinforce a growing centre of excellence within the UK in this area. The generalized framework proposed here, combined with two challenging engineering examples and the resources of the AIM Network, will make this possible and demonstrate it to a wider engineering community.

在过去的十年里，人们对应用于基础流体力学标准问题的非模态分析产生了浓厚的兴趣。即使在简单的流动中，这些非模态分析所预测的行为也可以完全不同于传统分析所预测的行为，而且比传统分析所预测的行为要精确得多，特别是对于工业情况下的流动类型。非模态分析在标准问题中的成功应用为工程实践中的阶跃变化奠定了基础。然而，必须克服一些非常重大的挑战。首先，标准方法不能处理工程中经常遇到的非线性问题。其次，标准方法计算量大，无法处理多自由度的问题。第三，标准方法处理简单的措施，如动能密度，而其他措施通常更适合工业情况。令人鼓舞的是，应用数学家和工程师在所有这些领域都取得了重大进展。这一进展表明，一个广义的制定的问题的约束优化和变分方法，适应和应用的控制和计算社区的方法，将弥合标准流量和工程problem. We的愿景之间的差距差距是，未来几代的工程计算流体动力学（CFD）工具将包含模块，可以执行非模态分析。如果这种分析能够付诸实践，它们肯定会改变工程师设计流体机械系统的方式，如燃烧室、涡轮机叶片、反应室和喷墨打印机。此外，他们可以很容易地处理瞬态效应和非周期性的时变基流，这往往是特别相关的工程situation.This研究将有利于英国工业依赖于流体力学和热声的建模和控制。例如，制药工业将受益于更好地了解生理流动中向湍流和再分层的转变，这对于通过鼻和上气道应用药物是重要的;燃气涡轮机工业将受益于能够对其燃料喷射器进行即时灵敏度分析，并将其与对导致燃烧不稳定的热声的更好理解联合收割机结合起来;风力涡轮机行业将受益于翼型对湍流转捩的敏感性的改进预测，以及暴露于阵风或前一翼型尾流的结果。该提案中的研究人员都是EPSRC资助的高级不稳定性方法（AIM）网络的创始成员，该网络成立于2009年1月，旨在探索非正态分析与工业问题的相关性。通过大师班和研讨会在学术界和工业界和越来越多的基于网络的资源，该网络提供了一个传播和利用本research.In总结，本建议的目标是弥合基础工作和工程实践之间的差距，嵌入这些技术在工程设计周期，并加强在英国在这一领域的卓越中心不断增长。这里提出的通用框架，结合两个具有挑战性的工程实例和AIM网络的资源，将使这成为可能，并向更广泛的工程社区展示。

项目成果

Local linear stability analysis of cyclone separators

• DOI: 10.1017/jfm.2017.89
• 发表时间: 2017-01
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: T. A. Grimble;A. Agarwal;M. Juniper

Acoustic state space models using a wave-based approach

使用基于波的方法的声学状态空间模型

• 发表时间: 2014
• 期刊: 21st International Conference on Sound and Vibration
• 作者: Illingworth, S

Transient perturbation growth in time-dependent mixing layers

随时间变化的混合层中的瞬态扰动增长

• DOI: 10.1017/jfm.2012.562
• 发表时间: 2013
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: Arratia C

Variational framework for flow optimization using seminorm constraints.

使用半范数约束进行流优化的变分框架。

• DOI: 10.1103/physreve.86.026306
• 发表时间: 2012
• 期刊: Physical review. E, Statistical, nonlinear, and soft matter physics
• 作者: Foures DP

The local and global stability of confined planar wakes at intermediate Reynolds number

• DOI: 10.1017/jfm.2011.324
• 发表时间: 2011-09
• 期刊: Journal of Fluid Mechanics
• 影响因子: 3.7
• 作者: M. Juniper;O. Tammisola;F. Lundell