Laboratoire de Mécanique des Fluides (UMR CNRS 6598), Equipe Modélisation Numérique, Ecole Centrale de Nantes, Nantes.
J Sports Sci. 2010 Oct;28(12):1287-98. doi: 10.1080/02640414.2010.485646.
Flow around a rowing blade is a very complex phenomenon, involving unsteady three-dimensional flow with violent motion of the free surface. However, in the literature, forces acting on blades are modelled using extreme and dubious simplifications. The aim of the present study was to evaluate the influence of free surface and unsteadiness (two physical characteristics that are commonly neglected when modelling loads on blades) as well as viscous effects. In fact, quasi-static approaches are often used, with no influence of the free surface effects. To conduct this study, computational fluid dynamics is used, supported by experimental results performed with a dedicated device reproducing a simplified rowing stroke in the towing tank. Comparisons show that both free surface flow and unsteadiness must be considered to capture the whole physics of the phenomenon accurately. In contrast, the viscous effects have a very limited influence.
划桨时的水流是一种非常复杂的现象，涉及到不稳定的三维流动和自由表面的剧烈运动。然而，在文献中，对桨叶上的力的建模使用了极端和可疑的简化。本研究的目的是评估自由表面和非稳态（在对桨叶上的力进行建模时通常被忽略的两个物理特性）以及粘性效应的影响。实际上，经常使用准静态方法，而不受自由表面效应的影响。为了进行这项研究，使用了计算流体动力学，并辅以使用专用设备在拖曳水池中再现简化划桨运动的实验结果。比较表明，必须考虑自由表面流动和非稳态，以准确捕捉现象的全部物理学。相比之下，粘性效应的影响非常有限。
