Investigations for Wake Field of Single-Screw and Twin-Skeg Container Ships in Model and Full-Scale by Unstructured Grid based RANS Solver

摘要

In designing surface vessels with better propulsive efficiency, ships' wake field near propeller plane is of the great interest. Leveraging viscous computational fluid dynamics (CFD) simulation as a tool to estimate the wake characteristics, there are two approaches, i.e. 1) model-scale based estimation, and 2) full-scale based estimation. In 1), resistance and self-propulsion simulations are performed in model-scale, and attentions are paid to wake distribution and self-propulsion factors, e.g. thrust deduction factor 1-t, effective wake factor 1-w_T and relative rotative efficiencyη_R. It is well-known that the wake distribution, 1-w_T and propeller open water efficiency η_o are subjected to scale effect, and thus several scaling methods have been proposed (ITTC 2011). In 2), resistance and self-propulsion simulations are performed in full-scale, and wake distribution and 1-w_T can be calculated without scaling.