The hydrodynamic problems of water entry of a wedge are investigated by a modified ghost-cell immersed boundary method. The modifications correspond to a newly proposed scheme for dealing with fluid–body interaction, and incorporation of CIP (Constraint Interpolation Profile) method and THINC/SW (Tangent of Hyperbola for Interface Capturing with Slope Weighting) method. The modified ghost-cell immersed boundary method uses a compact interpolation structure and gives the fluid properties to the ghost cell to achieve a more accurate treatment of fluid–body interaction. It can preserve the sharpness of the immersed boundary. To validate the new method, simulations of water entry of symmetric and asymmetric wedges in a single degree of freedom and water entry of an asymmetric wedge in three degrees of freedom are carried out, respectively. The variations of pressure, vertical velocity, vertical acceleration, angular displacement, and angular acceleration against time are focused on. The evolution of the free surface and velocity distributions of fluid is also analyzed. The results of numerical simulations are compared with available experimental results and fairly good agreement is obtained, which indicates that the present model is reliable.

中文翻译：

---

使用改进的鬼细胞浸入边界法的楔形入水数值模拟

采用改进的鬼细胞浸入边界法研究了楔形入水的流体动力学问题。这些修改对应于新提出的用于处理流体-体相互作用的方案，并结合了 CIP（约束插值剖面）方法和 THINC/SW（使用斜率加权进行界面捕获的双曲线切线）方法。改进的鬼细胞浸入边界方法使用紧凑的插值结构，并将流体属性赋予鬼细胞，以实现对流体-体相互作用的更准确处理。它可以保持浸入边界的清晰度。为了验证新方法的有效性，分别进行了单自由度对称和非对称楔入水和三自由度非对称楔入水模拟。重点研究压力、垂直速度、垂直加速度、角位移和角加速度随时间的变化。还分析了流体的自由表面和速度分布的演变。将数值模拟结果与已有的实验结果进行了比较，得到了较好的一致性，表明该模型是可靠的。