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Numerical predictions of hydrodynamic forces on a ship during a low-speed drift motion in shallow water including verification and validation
Author(s): 
Pages: 841-848
Year: Issue:  7
Journal: Journal of Ship Mechanics

Keyword:  shallow waterdrift motionhydrodynamic forceserror and uncertaintyverification and validation;
Abstract: Travelling at a drift angle in shallow water, the ship is affected by both the asymmetry flow and the blockage from shallow water. To predict the hydrodynamic forces on the ship, this paper applies a Com-putational Fluid Dynamics method based on the steady state Reynolds-Averaged Navier-Stokes equations to solve the viscous flow around the ship during a low-speed drift motion in shallow water. Considering the ship moves at a low speed, the effects of free surface are assumed negligible. Tendencies of the hydrody-namic forces against the drift angle are simulated from numerical computations. For the purpose of evaluat-ing the degree of accuracy in the numerical results, verification and validation analyses are performed. The numerical error and uncertainty are estimated from a grid convergence study, while the modelling errors are investigated along with the experimental data. In addition, the contributions of computational domain size, turbulence model, boundary condition, as well as the influence of sinkage and trim to the modelling errors are discussed. This study offers a useful reference for the improvement of the numerical model and the ac-curacy in numerical predictions.
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