Prediction of the Hydrodynamic Forces for a Ship Oscillating in Calm Water by an Improved Higher Order Rankine Panel Method

This paper presents a frequency-domain Rankine source method based on a biquadratic B-spline scheme with an improved radiation mechanism. The improved radiation mechanism, based on the introduction of spatially varying Rayleigh artificial damping in addition to the simplified Seto's radiation boundary conditions, is considered for modeling radiation of generated waves at various tau conditions, where tau=omega U/g including the undercritical condition (tau<0.25); this condition is present when a ship undergoes slow translation or low oscillatory frequency. In evaluations, the proposed method yields accurate solutions for unsteady flows produced by an oscillating, translationally moving submerged singularity. The radiation problem induced by a RIOS bulker is solved to have the resultant added mass and damping coefficients for further comparisons with the experimental data and the public numerical prediction by a simplified combined method at a wide tau region.

Automated summary

This paper presents an improved frequency-domain Rankine source method based on a biquadratic B-spline scheme with an improved radiation mechanism. The method accurately solves unsteady flows produced by an oscillating, translationally moving submerged singularity and simulates the radiation of generated waves at various tau conditions.