The Use Of Computational Fluid Dynamics to Evaluate Steady And Unsteady State Hydrodynamic Performance Of 3D Fin in Viscous Flow

摘要

The study of fin and control surfaces of underwater vehicle whether stationary or moving is an interesting and challenging research subject in the field of underwater locomotion and propulsion for underwater vehicle. In the present study, a computational fluid dynamic (CFD) RANS simulation of a 3D fin body has been developed to investigate the hydrodynamic coefficients (lift, drag and moment) when stationary and moving in a viscous liquid. In this simulation, an implicit pressure-based finite volume method is used for time dependent and independent accurate computation of incompressible flow using second order accurate convective flux discretisation schemes. The present work is divided into two parts, in the first part designing as well as steady state analyses of 3D Fin in interaction with viscous fluid is simulated for evaluation of hydrodynamic coefficients using structured and unstructured grid and the second part briefly covers all the aspects of unsteady state analyses along with computation results which are validated against the experimental model results performed in the towing tank along with the detailed discussions on various factors affecting the steady and unsteady hydrodynamic coefficients.