Numerical calculation of the slamming load for axisymmetric geometries during the later entry time based on generalized Wagner theory

作者：Zhao, Jiu Long; Yan, Fa Suo; Fan, Lei

来源：Journal of Ship Mechanics, 2016, 20(11): 1412-1419.

DOI：10.3969/j.issn.1007-7294.2016.07.007

• Axisymmetric geometries
• Free surfaces
• Grid's modification
• Slamming loads
• Surface elements

A numerical code used for calculating the slamming load for axisymmetric geometries based on 3D BEM was mainly introduced. The 3D mechanical model and Wagner's theory which considering the uplift free surface were both used in the numerical code. Cw which was called wetting factor was introduced to ensure the exact height of the uplift free surface. At the same time, the grid's movement was also considered and along the interface between the geometry and the free surface one group of grids were modified for a precise wet area. The Nonlinear Bernoulli equation considering the grid's movement was used for calculating the hydrodynamic pressure and the force could be obtained through integration. Besides, the conception of Virtual surface element was brought here so that the slamming load when the top point of the falling object was under the free surface could be achieved. That is to say, the traditional calculated time process was extended. At the same time, Alaoui slamming test was used to test the code's validity.

• 出版日期2016
• 单位哈尔滨工程大学