Hydrodynamic Interactions of a Multi-modular Semi-submersible type Very Large Floating Structure

摘要

This paper studied the hydrodynamic interaction of a semi-submersibletype multi-modular very large floating structure (VLFS) in the frequencydomain. To clarify the influence of multiple modules, the comparisonsbetween numerical data and model tests results were performed by utilizingpanel method. In consideration of the unrealistic wave elevationsdue to the ignore of the fluid viscosity and energy dissipation in potentialflow theory, a modification called damping-lid method was adoptedthrough introducing a damping term into the momentum equation andthe free surface condition. The results demonstrated that the hydrodynamicinteractions of multi-module system are important for preciselyevaluating the motions of VLFS modules in a narrow gap. The connectorand mooring system shows a significant impact on the RAOs of rolland yaw motions. Sensitivity analyses were carried out to figure out thedependency of the wave elevation on damping terms.