物理
湍流
两相流
机械
流量(数学)
分层流
相(物质)
经典力学
统计物理学
量子力学
作者
Yisheng Zhang,Azur Hodžić,Fabien Evrard,Berend van Wachem,Clara Marika Velte
出处
期刊:Physics of Fluids
[American Institute of Physics]
日期:2023-04-01
卷期号:35 (4)
被引量:3
摘要
A phase proper orthogonal decomposition (phase POD) method is demonstrated utilizing phase averaging for the decomposition of spatiotemporal behavior of statistically non-stationary turbulent flows in an optimized manner. The proposed phase POD method is herein applied to a periodically forced statistically non-stationary lid-driven cavity flow, implemented using the snapshot proper orthogonal decomposition algorithm. Space-phase modes are extracted to describe the dynamics of the chaotic flow, in which four central flow patterns are identified for describing the evolution of the energetic structures as a function of phase. The modal building blocks of the energy transport equation are demonstrated as a function of the phase. The triadic interaction term can here be interpreted as the convective transport of bi-modal interactions. Non-local energy transfer is observed as a result of the non-stationarity of the dynamical processes inducing triadic interactions spanning across a wide range of mode numbers.
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