3D Modeling Of Prionace Glauca And Fluid-structure Coupling Stress Characteristics Research

There are many kinds of energy forms such as ocean currents in the ocean.Autonomous underwater vehicles(AUV)have become important tools to explore marine resources,but their energy efficiency is not high and hydrodynamic performance is still at a low level.For the entire marine community,the shark and AUV are similar in the structure and size range,and the shark which has characteristics of sTab.swimming stance,high efficiency,long cruise distance has been living on the planet for hundreds of millions of years.This has a strong reference significance in terms of Reynolds number,so the research of shark’s efficient exercise model has an important value for optimal design of AUV.The main contents and achievements of this paper are as follows:(1)This paper selected the prionace glauca body as the research object,collected the characteristics data of the prionace glauca head,torso,dorsal fin,pectoral fins,pelvic fin,the anal fin and caudal fin according to the actual measurement of a prionace glauca specimen,and constructed three-dimensional accurate model with physical characteristics of prionace glauca.This research printed out all the parts of the prionace glauca body model with 3D printing technology,and joined them together into a whole.In order to reduce the deviation of smooth between the prionace glauca model and natural prionace glauca,this research processed the surface of the prionace glauca with the method of micro correction and grinding to improve the surface smoothness.(2)The research established a large cylindrical flow field for prionace glauca body model to avoid the interference which the flow field boundary has on the result of simulation.According to the characteristics of the prionace glauca body,this paper selected the APPropriate surface of unstructured grids,and distributed various parts of the prionace glauca body with different number of grids on the premise of both computational cost and accuracy to obtain a computational domain grid model with good quality.(3)The 3D model of prionace glauca is imported to software to operate the infinite calculation and analysis in flow field,thus the force spread across the body and pectoral fins is obtained.Multiple experiments of prionace glauca which is produced by 3D printer are conducted in the sink to test its hydrodynamic performance,and the fluid simulation result is verified through error analysis.The calculation results showed that prionace glauca’s head and pectoral fins had great contribution to the drag and lift force.Through the drag and lift force analysis of multiple sized prionace glauca in different velocity flow field,the varying law of prionace glauca’s head and pectoral fins is fitted,and general binary cubic description function of suffered drag and lift force in different velocity flow field is acquired,which set s Tab.basis for the Application of optimized design of AUV etc.(4)Through numerical description,the establishment of a two-dimensional fine pectoral model and the fluid-structure coupling simulation in the unsteady fluid,we found the variation features of Karman Vortex Street of flexible pectoral fins in the unsteady flow.Further comparative analysis of vortex characteristics of Prionace glauca pectoral fins models with different shapes under the same boundary conditions,the study found that the streamlined samples of pectoral fins help reduce the impact of water flow and improve the stability of prionace glauca during swimming in the flow field.(5)In order to obtain more accurate calculation results,the precise 3D model of prionace glauca was set up by numerical description combining other physical features of the prionace glauca body.The fluid-structure coupling simulation and analysis in flow field operatedatas were operated by importing the model into COMSOL software.Spread of pectoral fin surface deformation,elasticity and curvature automatically vary with the surrounding flow field is obtained,and the variation will buffer the instability in cruising.The resistance stresses on the prionace glauca fin with different material under unsteady flow impact verified that the flexible material can improve the stability of the prionace glauca body.Furthermore,general unary cubic description functions are acquired,which set foundation for the Application on AUV optimized design.(6)This paper carries out the secondary development of COMSOL simulation interface,and builds an APP.The research result can improve the ability of modeling and post-processing.This paper provides an important reference for COMSOL in practical engineering Application.