Abstract
This article deals with the low-Reynolds-number wake interaction in two- and three-body configurations, at various angles of attack and various bodies location, cross-section (circular and square cylinders), and diameter. The flow physics is studied using higher order dynamic mode decomposition, which determines the driving frequencies and associated spatial modes of the system. Dependence of such frequencies on the particular multibody configuration is analyzed in detail and compared with the results obtained for related single-body configurations. In particular, it is found that the wake of a multibody configuration exhibits the frequencies of the wakes of the individual isolated bodies. In addition, when the bodies are close to each other, there are new frequencies driving the flow that are related to the whole system of bodies acting as a single entity. The presence of several bodies may lead to the early transition to three-dimensional flow.
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