Low-order modelling of laminar flow regimes past a confined square cylinder
Low-order modelling of laminar flow regimes past a confined square cylinder
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DOI：
10.1017/s0022112004007906
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发表时间：
2004-03
影响因子：
3.7
通讯作者：
B. Galletti;C. Bruneau;L. Zannetti;A. Iollo
中科院分区：
文献类型：
--
作者：
B. Galletti;C. Bruneau;L. Zannetti;A. Iollo
针对受限方柱后的二维涡旋脱落问题，考虑了一种基于本征正交分解的模型。目的是研究该模型在雷诺数和阻塞比不同于其推导所依据的数值时的有效性。通过一种校准程序表明，就短期（一个周期）动力学而言，可以获得可靠的结果。在雷诺数变化的情况下，长期动力学能够被准确捕捉，然而当阻塞比改变时，误差会变得很大。依靠所获得的精确低阶模型，研究了在略高于临界雷诺数时涡旋脱落的可控性和可观测性。
A proper orthogonal decomposition based model is considered for two-dimensional vortex shedding past a confined square cylinder. The aim is to study the validity of such a model for Reynolds numbers and blockage ratios that are different from those for which the model was derived. Using a calibration procedure it is shown that reliable results can be obtained in terms of short-term (one period) dynamics. Long-term dynamics are accurately captured with a variation of the Reynolds number, whereas the error becomes large when the blockage ratio changes. The controllability and observability of vortex shedding at a slightly supercritical Reynolds number is investigated relying on the accurate low-order models obtained.