Experimental And Numerical Investigation Of Interaction Between Waves And Offshore Structures Using A CIP-based Model

Due to the effect of coastal structures,complex phenomenon,such as:reflection,refraction,diffraction,turbulent flow and high harmonic generation will occur when the waves propagate to offshore.The strongly nonlinear free surface large deformation problems,such as wave breaking,tumbling,and water vapor mixing,will also happen in extreme sea condition.Therefore,some experimental and numerical investigation need be done to improve our understanding of those complex phenomenons,which is important for the design and protection of the offshore structures.On the basis of summarizing the predecessors’ research results,this paper carried out study and numerical simulation under the condition of different depth,different scaling regular and solitary wave interaction with offshore structures of experimental.Firstly,experimental studies of wave interaction with vertical/inclined structure and submerged breakwater were carried out in a flume.The vertical/inclined structures were fixed onto an underwater cap.Our studies focus on nonlinear deformation behavior of the wave,wave breaking and the variation of hydrodynamic characteristics around the structure with different water depths.Secondly,numerical simulation of wave-structure interaction is done by a CIP-based model and the mathematical model use Navier-Stokes equation and continuity equation for the control equation in this paper,.On the basis of the multiphase flow theory considering solid-liquid-gas interaction,the model is built on a Cartesian grid system with the Navier-Stokes equations using a constrained interpolation profile(CIP)method for the flow solver,and a more accurate interface capturing scheme,the Tangent of hyperbola for interface capturing/Slope weighting(THINC/SW)scheme,is adopted as the interface capturing method.An immersed boundary method(IBM)is employed for the treatment of solid body boundary,which is proved easily handling of complex geometry and moving objects.Numerical simulation results of present model agree well with the experimental data.Before running the simulation,two and three dimensional simulations of the interaction between dam break water with obstacles were carried out to verify the reliability of present mode.Additionally,the numerical results are in good agreement with experimental data.The effects of the slope of the obstacle on performance of the wave deformations and flow field are investigated by present model.Research finds that changes of slope of inclined structure can directly lead the changes of formation and scale of the negative bore.