| Mussels are a common Marine shellfish,often attached to offshore engineering structures,and are also farmed artificially.In this paper,the influence of mussels attached to offshore engineering structures on the stress of engineering structures was analyzed.Porous media was used to simulate mussels,and the influence of mussels attached to the surface of cylindrical structures on their hydrodynamic characteristics was analyzed.In addition,the changes of the wave field inside the mussel farms under wave action were analyzed as follows:Based on navier-stokes equation and navier-stokes equation,the porous medium was simulated by Darcy-Forchhermer.The attached oil production riser was simulated as a solid cylinder with uniform porous medium in the center.The numerical simulation of the interaction between water flow and cylinder is verified by comparing with the existing experimental data.The numerical simulation of single and three cylinders surrounded by porous media is carried out in detail.Under the condition of three cylinders,the force and vorticity field of the cylinder are analyzed.The force on the cylinder and the flow field around the cylinder are analyzed under the conditions of different Reynolds number,porous media thickness and cylinder spacing.It can be obtained that different flow rates,porous media thickness and cylinder spacing have obvious effects on the second-order forces and vorticity phase around the cylinder.In order to understand the wave field distribution within the mussel beds and mussels list of stress distribution,this paper also established the interaction between porous medium and wave numerical model,the shear stress transport k-omega SST turbulence model to simulate mussels internal flow field and the wave field around,porous media model are adopted to simulate the mussels,mussel beds simulation of porous cylinder cylinder group.The numerical simulation of the interaction between waves and porous media is verified by comparing with the existing experimental data.The influence of the spacing between two adjacent mussel strings on the forces acting on the mussel strings is discussed and the interaction between the mussel field and the obliquely incident waves is analyzed.The results showed that with the decrease of spacing,the resistance of the downstream mussel string decreased significantly.When the spacing was less than 3D,the influence of spacing on the resistance was more sensitive.In addition,under the action of oblique incident waves,the wave force of the mussel farm was smaller,and the maximum drag force of the mussel farm decreased by 24.6% compared with that of the mussel farm at lean-wave beam = 30 ° and beam = 0 °.In this paper,a numerical model of the interaction between water flow,waves and porous media is established,which lays a foundation for the simulation of the influence of Marine mussels on the hydrodynamics of Marine engineering structures.The interaction between wave flow and porous media is a very complex problem.The study of this topic has important theoretical significance and engineering application value for coastal and offshore engineering. |
PDF Full Text Request