Fluid Dynamics & Aerodynamics

Biography

Biography: Jingwei Jiang

Abstract

A numerical prediction method, considering fluid-structure interaction, has been developed to predict and analyze the hydrodynamic performance of submarine, which is based on CFD (Computational Fluid Dynamics) and FEM (Finite Element Modeling) technology. The flow is considered to be uncompressible and viscous. SST k-ω is chosen as the turbulence model for its good precision and efficient computational-time cost, and SIMPLE algorithm is used to solve the coupled equations of pressure and velocity. Meanwhile, FEM is utilized to compute the structure response of the hull according to the unsteady fluid pressure outside, which is gained from the results of CFD. The interaction effect between the fluid flow and the structure is considered as weak coupling. The deformation of the submarine hull is taken into consideration in every iterative procedure instead of after accomplishing the CFD computation, helping to reduce the design time and increase efficiency greatly. Resistance, stress-strain and natural frequency have been gained from this method. The method is validated by comparing the computational result with the engineering estimation data. The numerical prediction method proposed in this paper is effective, reliable and practical, which makes it a suitable tool for the design and analysis of submarine.