Numerical Research On The Hydrodynamic And Structural Characteristics Of3D Hydrofoil Under Cavitaion

Modern ships demand further performance of stealth, comfort and security,however, cavitation will inevitably occur on their hydrofoils or propellers due tothe increasing speediness. As one kind of complex multi-phase flow, cavitationshows strong transient features, unsteady characteristics along with thedevelopment and collapse of cavity or bubble. The fluctuating pressure of surfaceincreases dramatically during cavitation, and gives rise of negative effect such asvibration, corrosion and noise. The mechanism of cavitation, its dynamic featurehave always been the main research contents in the hydrodynamic field.Compared to CFD simulation, fluid-structure-interaction considers theinteraction between hydrofoil’s deformation and fluid, its result can be moreaccurate to the reality and get hydrofoil’s structural loads under cavitation, can behelpful to predict and avoid its cavitation phenomenon, improve the foil’sefficiency, performance and hydrodynamic. This paper is based on the method offluid-structure-interaction, using the software CFX, Mechanical APDL andANSYS Workbench, analyzed the problem of hydrofoil’s cavitation flow by two-way fluid-solid coupling method, gives some hydrodynamic and structuralcharacteristics of3D hydrofoil under multi-phase flow.Firstly, CFD simulations were carried out to study on the cavitaion flow of3D hydrofoil by CFX solver, compared the different strategy of mesh generation,turbulence model to build the two-way FSI numerical model of foil. After thesimulation of hydrofoil in Aluminum Alloy, we got the rule of cavity bubbledeformation, lift and drag coefficient, structural load characteristics.Considering the facts that disturb hydrofoil’s cavitaion, this paper studiedthe difference of fluid hydrodynamic and structural characteristics as result of thechanging of angle of attack, structural stiffness, cavitation number. By means ofcoupling computation, we got to know the influence rule of the stiffness, angle ofattack, cavitation number on bubble shape, lift and drag coefficient, structuraldeformation, stress and strain distribution, etc.