A wave-frequency motion estimator for azimuthally-symmetric vessels.



Executive Summary

Discsim is a comprehensive 6 degree-of-freedom wave-frequency motion model for the special case of azimuthal hull symmetry. This tool is thus suited for modeling of buoy motions and loads in single-point mooring applications and for round vessel geometries often associated with operations in the presence of persistent ice. Discsim utilizes an efficient algorithm for calculation of wave-frequency forces and moments which permits accurate modeling using as input only gross hydrostatic and mass properties (metacentric heights, displacements, overall dimensions, centers of gravity, gyradii, etc.), eliminating the need for tedious and error-prone input of vessel lines details. This typically permits comprehensive executions to be completed in one hour or less. A wide range of environmental conditions is accommodated, including extensive built-in wave spectral types, azimuthal spreading of wave directions and an optional independent background swell. Accelerations, velocities and displacements at any point on the vessel can be computed. Effects of finite water depth are fully modeled and either English or metric units may be selected for vessel specification and data output. Output is in the form of amplitude and phase of vessel Response Amplitude Operators (RAOs) and/or statistical characterizations of vessel response to irregular wave conditions. Execution is carried out in the frequency domain, resulting in short run times and unambiguous predictions of statistical response values.

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