Pastur L R, Lusseyran F, Fraigneau Y, Podvin B
LIMSI, University of Paris XI, 91403 Orsay Cedex, France.
Phys Rev E Stat Nonlin Soft Matter Phys. 2005 Dec;72(6 Pt 2):065301. doi: 10.1103/PhysRevE.72.065301. Epub 2005 Dec 12.
We applied to an open flow a proper orthogonal decomposition (POD) technique, on two-dimensional (2D) snapshots of the instantaneous velocity field, to reveal the spatial coherent structures responsible for the self-sustained oscillations observed in the spectral distribution of time series. We applied the technique to 2D planes out of three-dimensional (3D) direct numerical simulations on an open cavity flow. The process can easily be implemented on usual personal computers, and might bring deep insights regarding the relation between spatial events and temporal signature in (both numerical or experimental) open flows.
我们将适当正交分解（POD）技术应用于开放流中瞬时速度场的二维（2D）快照，以揭示导致时间序列频谱分布中观察到的自持振荡的空间相干结构。我们将该技术应用于开放腔流三维（3D）直接数值模拟中的二维平面。该过程可以在普通个人计算机上轻松实现，并且可能会为（数值或实验）开放流中空间事件与时间特征之间的关系带来深刻见解。
