Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

FP5

REBASDO Berichtzusammenfassung

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

Wave-structure interaction for compact bodies such as cylinders

The interaction of steep waves with a vertical cylinder is both of practical importance in engineering design as well as being a suitable test case for general diffraction codes. This work studied the effect of wave directionality. Using a new and efficient approach for cylindrical geometries and a very fine frequency resolution suited for the analysis of compact wave groups, both surface elevation around and forces on the scattering body were predicted. These results were then used to validate developments for our general diffraction code DIFFRACT.

For relatively compact bodies, the significance of the size of the focus spot was highlighted. If the body fits within this region, then the response due to a directional spread wave group looks much like that for a slightly modified uni-directional wave group. If the body extends outside this region, then the diffracted field is more complex. Close to the body, the strong double-frequency scattered field shows important spatial structure with short crescent-shaped wave crests being locally generated and then advancing round the body.

The work also examined the adequacy of simple frequency-independent models for wave directional spreading compared to full frequency-directional spectral models. Again for compact bodies, a simple frequency independent model such as a wrapped Normal was shown to be adequate for engineering design.

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