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Validation and application of a fully nonlinear numerical wave tank for simulating floating offshore wind turbines

机译：全非线性数值波箱在海上浮式风轮机仿真中的验证与应用

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Numerical models are becoming a valid supplement, and even a substitute, to physical model testing for the investigation of fluid-structure interaction due to improved methods and a continuous increase in computational power. This research presents an extensive validation of a fully nonlinear numerical wave tank for the simulation of complex fluid-structure interaction of moored floating structures. The validation is carried out against laboratory measurements including recent and unpublished laboratory measurements of the OC5 floating offshore wind turbine subjected to waves. The numerical wave tank is based on the Navier-Stokes/6-DOF solver, inter-DyMFoam, provided by the open-source CFD-toolbox OpenFOAM, extended with the wave generation and absorption toolbox, waves2Foam, and an implementation for restraints of floating structures. Two methods are evaluated to address the instability issues of the partitioned Navier-Stokes/6-DOF solver, which are associated with artificial added mass. The model has been shown capable of computing detailed fluid-structure interactions, including dynamic motion response of a rigid structure in waves. However, instabilities due to numerical added mass is observed and discussed and it is concluded that further research is needed in order to establish a efficient yet stable scheme. Overall, good agreement is achieved between the numerical model and the physical model results.
机译：由于改进的方法和计算能力的不断提高，数值模型正成为物理模型测试的有效补充，甚至替代物理模型测试，以研究流固耦合。这项研究提出了一个完全非线性的数值波箱的广泛验证，用于模拟系泊浮动结构的复杂流固耦合。验证是针对实验室测量值进行的，包括最近和未公开的遭受浪潮的OC5浮动海上风力发电机的实验室测量值。数值波箱基于由开源CFD工具箱OpenFOAM提供的Navier-Stokes / 6-DOF解算器inter-DyMFoam，并扩展了波生成和吸收工具箱wave2Foam以及用于限制浮动的实现结构。评估了两种方法来解决分区的Navier-Stokes / 6-DOF解算器的不稳定性问题，这些问题与人工增加的质量有关。已经显示该模型能够计算详细的流体-结构相互作用，包括波浪中刚性结构的动态运动响应。然而，观察到并讨论了由于数值增加而引起的不稳定性，因此得出结论，需要进一步研究以建立有效而稳定的方案。总体而言，数值模型与物理模型结果之间取得了良好的一致性。

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