Potential flow methods for manoeuvring in confined waters Sample Clauses

Potential flow methods for manoeuvring in confined waters. The University of Strathclyde (SU) developed a numerical code to deal with the specific aspects of manoeuvring in shallow water as is required for port areas and channels. Given that these are restricted waters, waves are usually not important and thus an original manoeuvring code in calm water is the appropriate one for those conditions. A large number of validation studies have been carried out using the KVLCC2 ship particulars to investigate the manoeuvrability of the ship advancing in deep water and shallow water by using the in-house simulation program which is based on the Inoue model, the Kijima model, and the 3rd order polynomial model. Several CFD generated linear derivatives have been substituted to improve the accuracy of the simulations. Very satisfactory results have been obtained from comparisons with model tests and simulation results published by other organizations. For shallow water simulations, results are also reasonable when compared with a set of model test results which indicate that the shallow water effects can be clearly captured from the present simulations. Further validations on the DTC ship have also been carried out in deep and shallow water in the same manner as KVLCC2 case while the simulations apply the Kijima model and Inoue model respectively due to lack of precise nonlinear derivatives for the 3rd order model. Based on these works, an efficient way to predict the manoeuvrability of a ship navigating in shallow water while maintaining the precision has been established and the applicability of the corresponding empirical formulae to estimate the hydrodynamic coefficients is pointed out In addition, SU proposed a methodology and developed the in-house BEM numerical program MHydro, to investigate the interaction between two vessels either overtaking or crossing each other in restricted waters. The code is based on the 3-D Rankine source method and it has been developed over a number of years. This code was originally developed to predict the hydrodynamic interaction between two ships which are stationary or advancing in waves with the same forward speed. It has been validated through two pairs of models in head seas (Xxxx et al., 2014b; Xxxx et al., 2014c). Based on the framework of MHydro, the University of Strathclyde has proposed an uncoupled method to predict the hydrodynamic interaction between two ships during encounter or overtaking operations in calm water and also in waves. The proposed method has been validated u...
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