Practicability of unified theory in calculating ship hydrodynamics
[Objectives]This study seeks to address the low-frequency limitations in the computation of hy-drodynamics for slender ships using strip theory,and develops an efficient method for calculating hydro-dynamics over a wider frequency range for slender ships using a simplified approach.[Methods]Based on the unified theory of strip theory and ordinary slender body theory,the added mass and damping coefficients of a prolate spheroid,slender,modified Wigley model and S60 ship are calculated programmatically.A com-parison is made between the calculated results using the unified theory and experimental data,as well as res-ults obtained from strip theory,3D translating and pulsating source Green's function method and other meth-ods.The computational characteristics and advantages of the unified theory are then analyzed.[Results]The results indicate that the unified theory based on 2D sections produces results under zero-speed conditions that are consistent with those obtained by the 3D panel method.For conditions involving ship speed,the calculated results exhibit consistent variations with those obtained from the 3D translating and pulsating source Green's function method.[Conclusions]The proposed unified theory is capable of reflect-ing 3D effects in the low-frequency region,which gives it greater efficiency and simplicity compared to 3D methods,and thus significant practical value.
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