The realism of wave tank testing can be increased by the use of complex directional seas states. The measurement and validation of these wave conditions, however, comes with inherent difficulty and uncertainty. In this work we aim to reduce this uncertainty. A variety of directional sea states are generated in a unique circular wave tank, the FloWave Ocean Energy Research Facility. Two standard directional spectrum reconstruction methods are then used, in addition to an implementation of the Phase-Time-Path-Difference approach, taking advantage of knowledge about the wave generation method. We show that this PTPD approach is significantly quicker, whilst also reducing the perceived directional deviation down from 17.8% (BDM), and 34.2% (EMEP), to 4%. The method is also shown to be effective with resolving complex multi-modal sea states, and despite having some sensitivity to wave reflection, demonstrates how this method can be used to improve confidence in the validation of directional seas.
|Place of Publication
|Published - 2015