Abstract:
Objectives The hydrodynamic performance of the positioning bow type self-propelled cutter suction dredger (CSD) is of significant difference from ordinary ships, which is to be investigated so that stern lines could be rationally selected and designed.
Methods Firstly, Computational fluid dynamics (CFD)method is applied to carry out simulation verification and validation of model resistance test. On this basis, hydrodynamic performance of two hulls with various stern shapes, namely twin deadwood and twin skeg, including calm water resistance behavior, stern wake field, axial wake fraction, and the nonuniform level of axial wake field, is then compared and analyzed.
Results The result shows that the total resistance coefficient of twin skeg hull is lower than twin deadwood at each of target speeds,. At design speed, the total resistance coefficient of the former is 8.6% lower than the latter, while wake object function (WOF) of the latter is judged to be better than the former by 11.0% from perspective of the nonuniform level of axial wake field.
Conclusions The study result is of significant reference for lines design and optimization of similar hull type.
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