Numerical Study on Hydrodynamics of a Ship Advancing in Confined Waterways

Download or read book Numerical Study on Hydrodynamics of a Ship Advancing in Confined Waterways written by Hyunchul Kim and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prediction of ship hydrodynamics in the confined waterways is challenging. It may involve both ship-bottom and ship-bank interactions. When a ship is advancing in shallow water, the hydrodynamic behaviours may vary significantly due to the hydrodynamic interaction between the bottom of the ship hull and the seabed, or so called shallow water effects. The flow velocity in the gap between the ship bottom and the seabed increases, which will lead to an increase in ship's sinkage, trim and resistance. Also, the asymmetric flow around a ship induced by the vicinity of banks causes pressure differences between port and starboard sides, which is known as the bank effects. Therefore, an accurate prediction of shallow water and bank effects is essential to minimize the risk of the collision and the grounding for the ships. Flanders Hydraulics Research (FHR) in cooperation with the Maritime Technology Division of Ghent University has carried out shallow model tests in a towing tank equipped with surface-piercing banks and a vertical quay wall with a 1/75 scale model of the KRISO Very Large Crude carrier (KVLCC2). The forces and moments on the KVLCC2 model were obtained at various water depths, lateral distances to the banks. Additionally, the wave elevation was measured between the quay wall and the ship model. The main objective of the present paper is to simulate the complex flow around the ship and predict the hydrodynamic behaviours of a ship when advancing in the confined waterways. To simulate ship hydrodynamics in confined waterways, the CFD programme should be used to get a reliable result. In the present study, a widely used CFD programme, Star-CCM+, will be used to simulate the complex flow phenomena induced by a ship advancing in confined waterways. To evaluate the capability of the CFD software, the numerical data will be compared with the experimental data conducted by FHR. The free surface effect will be taken into account. The results will include the forces and moments acting on the ship, as well as the wave elevation between the quay wall and the ship model. The parametric study will be conducted to investigate the effects of the ship speed, the water depths and the positions in a channel. Discussions will be highlighted on the ship-bank interaction when the water depth Froude number approaches critical value.