Oscillating water columns (OWCs) have been studied extensively as promising wave energy converters. Different factors can affect the pneumatic power of OWCs, such as model scaling, turbine damping, and air compressibility. In this study, the heave motion of the OWC was limited by adding friction, and the effect of orifice size on the pneumatic power of an OWC from an unconstrained to a fixed position was investigated using a numerical method combining the k-ε/laminar model, the VOF interface capturing method, the motion-based zonal mesh update method and the 6DOF solver. Two groups of validation experiments and a study of model scaling were carried out to verify the effectiveness of the numerical method. It is concluded that the orifice open area ratio has an optimal value of approximately 1% whether the model is stationary or heaving; however, the heave motion has a significant weakening effect on the pneumatic power. More power can be extracted by constraining the heave motion of the OWC.

振荡水柱 (OWC) 作为有前途的波浪能转换器已被广泛研究。不同的因素会影响 OWC 的气动功率，例如模型缩放、涡轮阻尼和空气可压缩性。在这项研究中，通过增加摩擦来限制 OWC 的升沉运动，并使用结合k - ε的数值方法研究了孔口尺寸对 OWC 从无约束到固定位置的气动功率的影响。/层流模型，VOF界面捕获方法，基于运动的区域网格更新方法和6DOF求解器。进行了两组验证实验和模型缩放研究，以验证数值方法的有效性。得出的结论是，无论模型是静止的还是起伏的，孔口开口面积比的最优值约为1%；然而，升沉运动对气动功率有显着的削弱作用。通过约束 OWC 的升沉运动可以提取更多的功率。