CYLINDER WAKE DYNAMICS IN THE PRESENCE OF STREAM-WISE HARMONIC FORCING

机译：存在流明智谐波强迫的圆柱唤醒动力学

获取原文

获取原文并翻译 | 示例

页面导航

摘要
著录项
相似文献
相关主题

摘要

The vortex wake flow dynamics downstream of a cylinder undergoing streamwise harmonic (f_e/f_s=I) forced oscillations has been investigated numerically using a CFD code for Re=1000. The steady-state of the wake flow has been analysed considering the amplitude of oscillations as a perturbation parameter. The resulting dynamics of the fluid lift and drag forces acting on the cylinder have been linked to the different vortex wake modes observed downstream of the cylinder. Forced oscillations lead to periodic, quasi-periodic and chaotic responses depending on the amplitude of oscillation of the cylinder. Different vortex wake patterns or modes (including 2S, P+S and S modes) have also been identified and described. Symmetry related bifurcations both in the computed fluid force dynamics as well as in the vortex wake patterns were identified. The key role played by spatio-temporal symmetry in the interaction between the wake flow and the oscillating cylinder has been elucidated by a Proper Orthogonal Decomposition (POD) of the wake velocity field. Symmetric and antisymmetric spatio-temporal modes were identified and bifurcations in the wake flow were explained in terms of mode interactions in the wake.

机译：汽缸下游的涡流尾流动力学受到流向谐波（f_e / f_s = I）强迫振荡的影响，已使用CFD代码对Re = 1000进行了数值研究。分析了尾流的稳态，将振荡幅度作为摄动参数。产生的作用在气缸上的流体升力和阻力的动力学已经与气缸下游观察到的不同的涡流唤醒模式有关。强制振荡会导致周期性，准周期性和混沌响应，具体取决于圆柱体的振荡幅度。不同的涡流唤醒模式或模式（包括2S，P + S和S模式）也已被识别和描述。确定了在计算的流体动力学以及涡流尾流模式中对称性相关的分叉。时空对称在尾流与振荡圆柱之间的相互作用中所起的关键作用已由尾流速度场的适当正交分解（POD）阐明。确定了对称和反对称的时空模式，并根据尾流中的模式相互作用解释了尾流中的分叉。

著录项

来源
《ASME(American Society of Mechanical Engineers) Pressure Vessels and Piping Conference 2006 vol.4 pt.B: Fluid-Structure Interaction》|2006年|855-863|共9页
会议地点 Vancouver(CA)
作者
M.Rodriguez; N.W. Mureithi;
展开▼
作者单位

Fluid-Structure interaction Department of Mechanical Engineering Ecole Polytechnique Box 6079, Succ. Centre-Ville, Montreal, QC, Canada, H3C 3A7;

展开▼
会议组织
原文格式 PDF
正文语种 eng
中图分类工业用热工设备;
关键词

相似文献

外文文献
中文文献
专利

1. Wake Oscillator Model Proposed for the Stream-Wise Vortex-Induced Vibration of a Circular Cylinder in the Second Excitation Region [J] . 徐万海, 杜杰, 余建星, 中国物理快报：英文版 . 2011,第012期

机译：针对第二激振区中圆柱的流明智涡激振动提出的尾波振荡器模型
2. An iterative method for the computation of the response of linearised Navier-Stokes equations to harmonic forcing and application to forced cylinder wakes [J] . Liang Lu, George Papadakis International Journal for Numerical Methods in Fluids . 2014,第11期

机译：计算线性化Navier-Stokes方程对谐波强迫的响应的迭代方法，并将其应用于强迫圆柱面流
3. Bifurcation and stability analysis with the role of normal form symmetries on the harmonic streamwise forced oscillation of the cylinder wake [J] . Nabatian N., Mureithi N. W. European Journal of Mechanics, B. Fluids . 2018,第期

机译：分叉和稳定性分析，正常形式对称对气缸唤醒的谐波流动强制振荡的作用
4. CYLINDER WAKE DYNAMICS IN THE PRESENCE OF STREAM-WISE HARMONIC FORCING [C] . M.Rodriguez, N.W. Mureithi, American Society of Mechanical Engineers ASME Pressure Vessels and Piping Conference . 2007

机译：气缸唤醒动态在溪流方面的谐波强迫
5. Adhesion of Cylindrical Shells Under the Presence of Surface Forces [D] . Bausemer, Katherine. 2014

机译：在表面力作用下圆柱壳的附着力
6. Optomechanically induced transparency in the presence of an external time-harmonic-driving force [O] . Jinyong Ma, Cai You, Liu-Gang Si, -1

机译：在外部时间谐波驱动力的作用下光机致透明
7. Measurements of the pressure distributions on two circular cylinders of diameter d, vertically immersed in a turbulent boundary layer, are performed for various cylinder spacings s and angles of attack φ. The characteristics of the drag and lift forces acting on the cylinder are classified into three regions : i.e., 1) 0°＜__〜φ＜__〜30°, 2) 30°＜__〜φ＜__〜120°and 3) 120°＜__〜φ＜__〜180°which are divided by the two zero-lift force lines. Moreover, it is found that the interference between two cylinders is almost negligible for s/d＞__〜4, except for the influence of the wake region of the upstream cylinder. [O] . 谷口清一, 坂本弘志, Seiichi TANIGUCHI, 1980

机译：对于不同的气缸间距s和迎角φ，对垂直浸入湍流边界层的直径为d的两个圆柱上的压力分布进行测量。作用在气缸上的阻力和提升力的特性分为三个区域：1）0°＜__ 〜φ ＜__ 〜30°，2）30°＜__ 〜φ ＜__ 〜120°和3） 120°＜__ 〜φ ＜__ 〜180°除以两条零升力线。而且，发现除了上游气缸的尾流区域的影响之外，对于s / d＞ __〜4，两个气缸之间的干扰几乎可以忽略。

CYLINDER WAKE DYNAMICS IN THE PRESENCE OF STREAM-WISE HARMONIC FORCING

摘要

著录项

相似文献

相关主题

期刊订阅