Smoothed Particle Hydrodynamics Modeling Of The Flow Field Around And In Porous Structures

At present,pore structures are widely used in Marine engineering,such as breakwater protective layer,riprap breakwater,permeable submerged breakwater,artificial reef and so on.Under the action of various water flows,the characteristics of pore structure logistics field will change,resulting in a variety of complex physical phenomena,such as wave breaking,wave crossing,etc.At the same time,the stability and safety of pore structure will also be affected.Therefore,the study of pore structure logistics field characteristics can provide some theoretical guidance for Marine structure design.With the rapid development of computer and mathematical calculation methods,and the numerical simulation method is economical and not affected by scale effect,numerical simulation method has become more and more popular to study fluid mechanics problems.Therefore,Smooth Particle Hydrodynamic method suitable for simulating complex fluid phenomena is used in this paper to simulate the interaction between waves,ocean currents and dam break flows and pore structures.1.Smooth Particle Hydrodynamics(SPH)was used to simulate the internal and external flow field of pore structures under wave action,and the flow field effects around pore structures under different working conditions were analyzed to obtain the flow field characteristics of pore structures under wave action.In addition,through analysis,the SPH model established in this paper has good convergence for the simulation of pore structure logistics field under wave action.2.A numerical model of the interaction between ocean currents and pore structures is established by simulating ocean currents with periodic boundary conditions.The model was used to simulate the internal and external flow fields of the structure with different porosity,and the velocity distribution and eddy current motion law of the back eddy field were explored.At the same time,comparative analysis was made with the experimental results of H.C.Chan and other scholars to verify the correctness of the model.In addition,it is proved that the model has good convergence under different calculated particle sizes.3.Smooth Particle Hydrodynamics(SPH)method was used to simulate and study the flow field characteristics of dam break flow acting on pore structures at different structure distances and bottom bed slope angles,and the physical phenomena such as water impacting on structures,rolling,falling and permeating were reproduced.By analyzing the pressure on the pore structure and the distribution of the flow field around the pore structure at different moments,it is found that the falling water generated after the dam break water impinges on the pore structure has a certain energy dissipation effect on the upstream water flow.Meanwhile,the impact pressure tends to be stable with the passage of time.Therefore,the SPH model established in this paper can effectively simulate the distribution of pore structure logistics field under different water flows,which can provide a certain theoretical basis for the design of Marine engineering structures.