NONLINEAR DYNAMICS OF BLUFF-BODY WAKES AND FLUID-STRUCTURE INSTABILITIES: A SYMMETRY-GROUP BASED APPROACH
钝体尾流和流结构不稳定性的非线性动力学:基于对称群的方法
基本信息
- 批准号:RGPIN-2015-06604
- 负责人:
- 金额:$ 1.82万
- 依托单位:
- 依托单位国家:加拿大
- 项目类别:Discovery Grants Program - Individual
- 财政年份:2018
- 资助国家:加拿大
- 起止时间:2018-01-01 至 2019-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The subject of interest is fluid-structure interaction (FSI) involving large and/or complex systems with inherent symmetry. Such systems are ubiquitous in nature and in engineering. Typical examples include mechanical and civil engineering structures such truss structures, dome structures, space structures as well as machines jet engines etc.******Symmetry in many cases leads to highly simplified behavior, even for large complex systems. At the same time, symmetry may lead to unexpected and counter-intuitive behavior which can be difficult to explain or fully understanding without delving into the details of system dynamics under the influence of symmetry. ******There has been increasing interest in symmetry group theory and its application to large complex engineering systems ranging from space structures to high speed trans and jet engines. However, systematic exploitation remains limited. Yet there are many problems where symmetry theory provides deep insight into the dynamics of complex systems. The problem of mode localization in rotating machines is now well known and understood. This problem, which perplexed engineers in the 50s can very conveniently, explained using symmetry group theory. ******In the proposed research program the additional effects associated with the presence of fluid flow interacting with the structures will be investigated. Mode localization / symmetry-breaking drastically changes the effective vibration modes. This is expected to significantly modify the stability behavior of tubes subjected to axial flow. To address the challenge of complexity in large systems the proposed research program employs symmetry group theory to develop feasible reduced order models (ROMs) for large and complex systems. The specific problems addressed are in the area of fluid-structure interactions for (i) complex flows such as wake flows behind circular cylinders and (ii) or large flow-structure systems such as cylinder arrays undergoing flow-induced instabilities. ******Besides the predicting the observed dynamical behavior, a potentially more important contribution of the symmetry based model is the demonstration of the link between the wake flow dynamics and the dynamics of the general class of physical and mathematical systems having the same symmetry. As a specific example, the Karman wake undergoes a period-doubling bifurcation for high amplitude forcing. ******The period-doubling bifurcation of the Karman wake is intimately related to the relative symmetry between the forcing perturbation and the symmetry of the Karman wake flow. Other physical systems having the same relative symmetries include pendulums with periodically oscillating support, and fluid-filled vessels under vertical excitation. The systems also exhibit period-doubling instabilities due to the same symmetry breaking instability. ***********
感兴趣的主题是涉及具有固有对称性的大系统和/或复杂系统的流固耦合(FSI)。这样的系统在自然界和工程中无处不在。典型的例子包括机械和土木工程结构,如桁架结构、穹顶结构、空间结构以及机器喷气发动机等。在许多情况下,对称导致高度简化的行为,即使对于大型复杂系统也是如此。同时,对称性可能导致意想不到的和反直觉的行为,如果不深入研究对称性影响下的系统动力学的细节,这些行为可能很难解释或完全理解。对称群理论及其在从空间结构到高速运输和喷气发动机的大型复杂工程系统中的应用引起了越来越多的兴趣。然而,系统性的开发仍然有限。然而,在许多问题中,对称性理论提供了对复杂系统动力学的深刻洞察。旋转机械中的模式局部化问题现在已经广为人知。这个困扰着50年代工程师的问题,可以很方便地用对称群理论来解释。*在拟议的研究计划中,将研究与流体与结构相互作用的存在相关的额外影响。模局部化/对称破缺极大地改变了有效振动模。这有望显著改变管子在轴流作用下的稳定性。为了应对大系统复杂性的挑战,提出的研究方案利用对称群理论来开发适用于大系统和复杂系统的可行降阶模型(ROMs)。所涉及的具体问题是:(I)复杂流动,如圆柱体后的尾流;(Ii)或大的流动-结构系统,如经历流动诱导不稳定性的圆柱体阵列。*除了预测观测到的动力学行为外,基于对称性的模型的一个潜在的更重要的贡献是证明了尾流动力学与具有相同对称性的一般物理和数学系统的动力学之间的联系。作为一个具体的例子,卡门尾迹由于高振幅强迫而经历了倍周期分叉。*卡门尾迹的倍周期分叉与强迫扰动和卡门尾迹流的对称性之间的相对对称性密切相关。其他具有相同相对对称性的物理系统包括具有周期性摆动支承的钟摆,以及在垂直激励下充满流体的容器。由于相同的对称破缺不稳定性,系统也表现出倍周期不稳定性。***********
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Mureithi, Njuki其他文献
Mitigation of jet cross-flow induced vibrations using an innovative biomimetic nozzle design inspired by shark gill geometry.
- DOI:
10.1038/s41598-022-15026-8 - 发表时间:
2022-06-30 - 期刊:
- 影响因子:4.6
- 作者:
Gad-el-Hak, Ibrahim;Mureithi, Njuki - 通讯作者:
Mureithi, Njuki
Fluidelastic instability of a rod bundle subjected to jet cross-flow
- DOI:
10.1016/j.jfluidstructs.2023.103870 - 发表时间:
2023-03-30 - 期刊:
- 影响因子:3.6
- 作者:
Gad-el-Hak, Ibrahim;Mureithi, Njuki;Karazis, Kostas - 通讯作者:
Karazis, Kostas
Jet cross-flow induced vibrations in rod bundles. Part I: Experimental apparatus and stream-wise vibration results
- DOI:
10.1016/j.nucengdes.2022.112046 - 发表时间:
2022-12-01 - 期刊:
- 影响因子:1.7
- 作者:
Gad-el-Hak, Ibrahim;Mureithi, Njuki;Williams, Gary - 通讯作者:
Williams, Gary
Fluidelastic instability of a fuel rod bundle subjected to combined axial flow and jet cross-flow
- DOI:
10.1016/j.jfluidstructs.2023.103939 - 发表时间:
2023-07-12 - 期刊:
- 影响因子:3.6
- 作者:
Gad-el-Hak, Ibrahim;Mureithi, Njuki;Karazis, Kostas - 通讯作者:
Karazis, Kostas
Principal component analysis of vibration response of a rod bundle subjected to jet cross-flow
- DOI:
10.1016/j.jsv.2023.117592 - 发表时间:
2023-02-14 - 期刊:
- 影响因子:4.7
- 作者:
Gad-el-Hak, Ibrahim;Mureithi, Njuki;Williams, Gary - 通讯作者:
Williams, Gary
Mureithi, Njuki的其他文献
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{{ truncateString('Mureithi, Njuki', 18)}}的其他基金
FLUIDELELASTIC INSTABILITY, VORTEX-INDUCED VIBRATION AND SYMMETRY BREAKING IN HELICAL ARRAYS OF CYLINDERS SUBJECTED TO CROSS-FLOW
横流圆柱螺旋阵列中的流体弹性不稳定性、涡激振动和对称性破缺
- 批准号:
RGPIN-2020-06955 - 财政年份:2021
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
Vibration of fuel bundles subjected to combined axial and localized cross-flow
轴向和局部横流组合作用下燃料棒束的振动
- 批准号:
529585-2018 - 财政年份:2021
- 资助金额:
$ 1.82万 - 项目类别:
Collaborative Research and Development Grants
Vibration of fuel bundles subjected to combined axial and localized cross-flow
轴向和局部横流组合作用下燃料棒束的振动
- 批准号:
529585-2018 - 财政年份:2020
- 资助金额:
$ 1.82万 - 项目类别:
Collaborative Research and Development Grants
FLUIDELELASTIC INSTABILITY, VORTEX-INDUCED VIBRATION AND SYMMETRY BREAKING IN HELICAL ARRAYS OF CYLINDERS SUBJECTED TO CROSS-FLOW
横流圆柱螺旋阵列中的流体弹性不稳定性、涡激振动和对称性破缺
- 批准号:
RGPIN-2020-06955 - 财政年份:2020
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
Vibration of fuel bundles subjected to combined axial and localized cross-flow
轴向和局部横流组合作用下燃料棒束的振动
- 批准号:
529585-2018 - 财政年份:2019
- 资助金额:
$ 1.82万 - 项目类别:
Collaborative Research and Development Grants
NONLINEAR DYNAMICS OF BLUFF-BODY WAKES AND FLUID-STRUCTURE INSTABILITIES: A SYMMETRY-GROUP BASED APPROACH
钝体尾流和流结构不稳定性的非线性动力学:基于对称群的方法
- 批准号:
RGPIN-2015-06604 - 财政年份:2019
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
Vibration of fuel bundles subjected to combined axial and localized cross-flow
轴向和局部横流组合作用下燃料棒束的振动
- 批准号:
529585-2018 - 财政年份:2018
- 资助金额:
$ 1.82万 - 项目类别:
Collaborative Research and Development Grants
NONLINEAR DYNAMICS OF BLUFF-BODY WAKES AND FLUID-STRUCTURE INSTABILITIES: A SYMMETRY-GROUP BASED APPROACH
钝体尾流和流结构不稳定性的非线性动力学:基于对称群的方法
- 批准号:
RGPIN-2015-06604 - 财政年份:2017
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
NONLINEAR DYNAMICS OF BLUFF-BODY WAKES AND FLUID-STRUCTURE INSTABILITIES: A SYMMETRY-GROUP BASED APPROACH
钝体尾流和流结构不稳定性的非线性动力学:基于对称群的方法
- 批准号:
RGPIN-2015-06604 - 财政年份:2016
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
NSERC/BWC-AECL Industrial Chair in Fluid-Structure Interaction
NSERC/BWC-AECL 流固耦合工业主席
- 批准号:
428696-2010 - 财政年份:2015
- 资助金额:
$ 1.82万 - 项目类别:
Industrial Research Chairs
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- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
NONLINEAR DYNAMICS OF BLUFF-BODY WAKES AND FLUID-STRUCTURE INSTABILITIES: A SYMMETRY-GROUP BASED APPROACH
钝体尾流和流结构不稳定性的非线性动力学:基于对称群的方法
- 批准号:
RGPIN-2015-06604 - 财政年份:2016
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
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- 批准号:
462048-2014 - 财政年份:2015
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Accelerator Supplements
Vortex dynamics and energy transfer in turbulent 3D bluff-body wakes.
湍流 3D 钝体尾流中的涡动力学和能量传递。
- 批准号:
RGPIN-2014-03660 - 财政年份:2015
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual
NONLINEAR DYNAMICS OF BLUFF-BODY WAKES AND FLUID-STRUCTURE INSTABILITIES: A SYMMETRY-GROUP BASED APPROACH
钝体尾流和流结构不稳定性的非线性动力学:基于对称群的方法
- 批准号:
RGPIN-2015-06604 - 财政年份:2015
- 资助金额:
$ 1.82万 - 项目类别:
Discovery Grants Program - Individual