Abstract
Wave slamming loads on a circular cylinder during water entry and the subsequence submergence process are predicted based on a numerical wave load model. The wave impact problems are analyzed by solving Reynolds-Averaged Navier-Stokes (RANS) equations and VOF equations. A finite volume approach (FV) is employed to implement the discretization of the RANS equations. A two-dimensional numerical wave tank is established to simulate regular ocean waves. The wave slamming problems are investigated by deploying a circular cylinder into waves with a constant vertical velocity. The present numerical method is validated using other numerical or theoretical results in accordance with varying free surface profiles when a circular cylinder sinks in calm water. A numerical example is given to show the submergence process of the circular cylinder in waves, and both free surface profiles and the pressure distributions on the cylinder of different time instants are obtained. Time histories of hydrodynamic load on the cylinder during the submergence process for different wave impact angles, wave heights, and wave periods are obtained, and results are analyzed in detail.
Highlights
Wave impact problem is of great interest in the marine and offshore industries, especially for subsea working systems which are widely used in such applications as marine resource development and utilization, maritime exploration and survey; the important problem which needs to be solved before their proper operations is to accurately study the phenomenon of offshore structures impacting ocean wave and the following submergence process
For pressure-velocity coupling, the pressure implicit with splitting of operators (PISO) scheme is used, because problems presented in this paper generally involve transient flows
Main setups of simulations are as follows: the target wave which is simulated in Section 3.1 is employed; the radius of the circular cylinder R is 1 m; the constant downward velocity of the cylinder V is 1 m/s; the initial distance between the center of the cylinder and the calm water surface h is 4 m
Summary
Wave impact problem is of great interest in the marine and offshore industries, especially for subsea working systems which are widely used in such applications as marine resource development and utilization, maritime exploration and survey; the important problem which needs to be solved before their proper operations is to accurately study the phenomenon of offshore structures impacting ocean wave and the following submergence process. Gu et al simulated water impact problem of a semicircular cylinder with the free surface captured using level set method [11]. Aristodemo et al performed numerical study on waveinduced forces of submerged circular cylinders by SPH method [16]. This work is devoted to investigate the complex interaction between a circular cylinder and waves during the submergence process. Both governing equations and boundary conditions are outlined; to study the interaction between wave and cylinders, a numerical wave tank is established, and numerical wave generation and absorption method are presented. Numerical simulations of a circular cylinder impact with waves are conducted, and free surface profiles of different time instants of submergence process are shown. Slamming loads on the circular cylinder are computed, and influence of wave parameters is discussed
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