A method to produce freak waves with arbitrary spectrum in a fully directional wave basin is presented here. This is an extension of Waseda, Houtani and Tanizawa at OMAE 2013, which used “HOSM-WG” based on the higher-order spectral method (HOSM). We used the following three methods to improve the HOSM-WG in : “separation of free waves from bound waves,” “using Biesel’s transfer function in wavenumber space” and “using Schaffer’s 2nd-order wave maker control method.” Modulational wave trains, freak waves in unidirectional irregular waves and freak waves in short-crested irregular waves were generated in a wave basin. The experimental results using the improved HOSM-WG were compared to the HOSM simulation, and good agreements were found. The effectiveness of the improved HOSM-WG was ascertained. We showed that the difference between HOSM-WG and HOSM simulations became larger as wave steepness, frequency bandwidth of the spectrum or directional spreading became larger.
Freak Wave Generation in a Wave Basin With HOSM-WG Method
Houtani, H, Waseda, T, Fujimoto, W, Kiyomatsu, K, & Tanizawa, K. "Freak Wave Generation in a Wave Basin With HOSM-WG Method." Proceedings of the ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. Volume 7: Ocean Engineering. St. John’s, Newfoundland, Canada. May 31–June 5, 2015. V007T06A085. ASME. https://doi.org/10.1115/OMAE2015-42284
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