This paper presents the implementation and validation of a strongly coupled numerical model of a fully passive flapping foil turbine operating at a high Reynolds number. Thanks to a strong fluid–solid coupling strategy, the well known added-mass instability is mitigated while simulating a lightweight flapping foil. The numerical results are first validated in the case of a fixed foil undergoing static stall. The model is then validated with respect to numerical results available in the literature for a heavy flapping foil turbine. Finally, the numerical results of the strongly coupled model are compared to experimental data of a lightweight turbine prototype tested in a confined channel. The numerical results have shown to be in good agreement with the experimental measurements. Indeed, the kinematics and harvesting performances of the turbine prototype have been accurately reproduced by the numerical simulations. Besides, the leading edge vortex shedding observed in the experiments has also been precisely reproduced by the numerical results. The strongly coupled model implemented and validated in the present paper constitutes a useful tool for expanding the parameter space in the search for an optimised design of the fully passive flapping foil turbine.

本文介绍了在高雷诺数下运行的全无源扑翼式水轮机强耦合数值模型的实现和验证。由于采用了强大的流固耦合策略，在模拟轻巧的拍打箔片时，可以减轻众所周知的附加质量不稳定性。在固定箔经受静态失速的情况下，首先验证数值结果。然后针对重型扑翼式水轮机的文献中可用的数值结果对模型进行验证。最后，将强耦合模型的数值结果与在密闭通道中测试的轻型涡轮机原型的实验数据进行了比较。数值结果表明与实验测量结果非常吻合。的确，通过数值模拟可以精确地再现出涡轮原型的运动学和收割性能。此外，数值结果也精确地再现了实验中观察到的前沿涡旋脱落。本文中实现和验证的强耦合模型构成了一个有用的工具，可用于扩展参数空间，以寻求全被动襟翼式涡轮机的优化设计。