Abstract Oscillating water column (OWC) device is possibly the most studied among various wave energy converters and many different realizations of the technology have been investigated. To study the complex hydrodynamic behaviour of an OWC, a two-dimensional numerical wave tank based on the weakly compressible smoothed particle hydrodynamics (SPH) method is developed in this paper. A simplified pneumatic model is proposed here to simulate the effect induced by a pneumatic power take-off system within the framework of a single-phase SPH model, and implemented to determine the air pressure imposed on the free surface inside the OWC chamber. Additionally, a regional ghost particle approach, as boundary condition in SPH, is proposed to better simulate fluid dynamics near a thin wall. The overall computation cost is reduced dramatically due to the employment of the regional ghost particle boundary condition method. First, the numerical model is validated under regular waves using published physical and numerical data. An extensive campaign of computational tests is then carried out, studying the performance of the OWC for various wall thicknesses and damping coefficient under various wave conditions. The results demonstrate that the present SPH model can be used as a practical tool for the development of high-performance OWCs.

中文翻译：

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陆上振荡水柱装置的流体动力学：使用平滑粒子流体动力学的数值研究

摘要 振荡水柱 (OWC) 装置可能是各种波浪能转换器中研究最多的，并且已经研究了该技术的许多不同实现方式。为了研究OWC的复杂流体动力学行为，本文开发了一种基于弱可压缩光滑粒子流体动力学（SPH）方法的二维数值波浪水池。这里提出了一个简化的气动模型，以在单相 SPH 模型的框架内模拟气动动力输出系统引起的影响，并实施以确定施加在 OWC 室内自由表面上的气压。此外，作为 SPH 边界条件的区域鬼粒子方法被提出，以更好地模拟薄壁附近的流体动力学。由于采用了区域重影粒子边界条件方法，总体计算成本显着降低。首先，使用已发布的物理和数值数据在规则波下验证数值模型。然后进行广泛的计算测试，研究 OWC 在各种波浪条件下对各种壁厚和阻尼系数的性能。结果表明，目前的 SPH 模型可以用作开发高性能 OWC 的实用工具。研究 OWC 在各种波浪条件下对各种壁厚和阻尼系数的性能。结果表明，目前的 SPH 模型可以用作开发高性能 OWC 的实用工具。研究 OWC 在各种波浪条件下对各种壁厚和阻尼系数的性能。结果表明，目前的 SPH 模型可以用作开发高性能 OWC 的实用工具。