Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

FP5

REBASDO Berichtzusammenfassung

Project ID: ENK6-CT-2000-00107
Gefördert unter: FP5-EESD
Land: United Kingdom

Hydrodynamics of ship shaped bodies

The interaction of steep waves with the curved bow of a ship shaped body was studied both computationally using 2nd order diffraction theory and experimentally in a wave tank. As part of the project, the Oxford code DIFFRACT was enhanced to give predictions of surface elevation as well as forces. In contrast to wave scattering by a surface-piercing vertical cylinder where there are strong third-order effects, the measured wave run-up and subsequent scattering from the ship was reproduced remarkably well by the 2nd order computation. Thus, the main wave scattering process is fully captured by the latest generation of engineering design tools.

The diffraction of directionally spread waves in a random sea poses severe computational problems using standard 2nd order theory because of the requirement to have discrete components in both frequency and direction. A new method was developed such that extreme events are built from discrete frequency components - as for uni-directional waves - but these single frequency components are now themselves directionally spread. This permits the incorporation of wave directional information into design calculations practical in a manner not possible before.

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