Numerical Study on Viscous Hydrodynamic Forces Acting on a Berthing Tanker Model

摘要

A berthing ship usually undergoes an unsteady and low-speed lateralrnmotion. Accurate prediction of the viscous hydrodynamic forces on thernship is important to estimate the maneuvering performance of the shiprnin berthing condition. The flow field around a real ship undergoingrnberthing motion is very complicated, and the viscous hydrodynamicrnforces acting on the hull are varying with time during the unsteadyrnberthing process, which is quite different from those for the ship inrnnormal navigation. Especially for real ships, yaw moment andrnlongitudinal force may be remarkable due to the different form at bowrnand stern part. The focus of the present work is placed on numericalrnsimulation of the viscous flow field and prediction of the unsteadyrnlongitudinal and lateral forces and yaw moment acting on a real shiprnundergoing unsteady berthing motion. A KVLCC2 tanker model isrntaken as example for the numerical investigation. The unsteadyrnReynolds-Averaged Navier-Stokes (URANS) equations are solved byrnusing a general purpose CFD code FLUENT with the SST k-ωrnturbulence model. Detailed flow features at some characteristic time arerncaptured, and the time history of the viscous hydrodynamic forces arernpresented and analyzed.