The objective of this work is to experimentally investigate the dynamic evolution of flow structure and pressure distribution on the water entry of a bulbous bow. We focus on the water entry of an arbitrary bow based on the 18.5 station line of the KRISO container ship with a typical bulbous bow. Time-resolved particle image velocimetry (TR-PIV) is utilized to capture the transient flow information during the bow slamming. The instantaneous pressure is estimated by solving the incompressible Navier–Stokes equation using the Lagrangian approach. Our findings demonstrate the formation and migration of a saddle point, the generation of a strong shear layer near the concave zone at a low initial velocity, and the deformation of an air pocket at a high initial velocity. Furthermore, we offer insight into the reconstructed pressure field over the entire duration of the slamming, especially the dramatic slamming pressure during the secondary impact. It is interesting that the peak value locates on the critical point of the upward and downward flow caused by the pressing of the bow flare. In addition, the pressure close to the flare continuously keeps the global maximum.

这项工作的目的是通过实验研究球根弓入水口的流动结构和压力分布的动态演变。我们将重点放在基于KRISO集装箱船的18.5工位线（带有典型球茎型船首）的任意船头的进水口上。时间分辨粒子图像测速仪（TR-PIV）用于捕获船首砰击过程中的瞬态流量信息。通过使用拉格朗日方法求解不可压缩的Navier–Stokes方程，可以估算瞬时压力。我们的发现表明，鞍点的形成和迁移，低初始速度下凹区附近的强剪切层的产生以及高初始速度下气穴的变形。此外，我们提供了在整个撞击过程中重建压力场的见识，尤其是在二次撞击过程中剧烈的撞击压力。有趣的是，峰值位于由弓形火把的挤压引起的向上和向下流动的临界点上。此外，靠近火炬的压力持续保持全局最大值。