Numerical investigations of the successive wave strike processes on the coastal slope dike using OpenFOAM®

Abstract

During extreme climate and weather events, periodic large waves rush up coastal slope dike structures and develop overtopping flows, causing various hydrodynamic actions on coastal structures and pedestrians, resulting in casualties and property losses. This paper established a high-precision three-dimensional numerical wave flume based on a finite-volume discrete two-phase flow solver. Regular wave overtopping behaviors and flow strike actions on the crest of a simple slope dike and a compound slope dike berm were simulated and investigated. The hydrodynamic characteristics of successive wave strike accidents against objectives located on the coastal dikes were analyzed and summarized. Regular waves were selected to clarify the mechanisms affected by the two key parameters: wave period and wave height. The distribution mechanisms of parameters, such as the thickness and velocity of the flow layer and the fluid forces exerted on the cylinder on the simple slope dike crest, were analyzed. The study featured the reflecting flow over the berm of the compound slope dike and the nonlinear flow behavior created by successive incident regular waves. It revealed the crucial influencing mechanism of the incident wave period on various hydrodynamic parameters.