Aeration Effects on Hydrodynamic Loads of Circular Cylinder's High-speed Water Entry

摘要

The water entry of two-dimensional circular cylinder at high-impact velocity is studied numerically. The flow model treats the fluid as a compressible mixture of air and water with homogeneous material properties. A high-resolution Godunov-type method is employed to solve the governing equations numerically. The impact loads in both pure water and aerated water conditions are investigated. The aerated water is modeled using the analogy with problems of shock wave propagation in compressible foam. It turns out that the impact force is found to increase with the velocity, as expected, and the aerated gas has a significant reduction on the impact load.