Print Email Facebook Twitter Comparison of breaking models in envelope-based surface gravity wave evolution equations Title Comparison of breaking models in envelope-based surface gravity wave evolution equations Author Liu, Yuxuan (University of Oxford) Eeltink, D. (University of Oxford; Massachusetts Institute of Technology) Tang, Tianning (University of Oxford) Barratt, D. (University of Oxford) Li, Ye (Shanghai Jiao Tong University) Adcock, T. A.A. (University of Oxford) van den Bremer, T.S. (TU Delft Environmental Fluid Mechanics; University of Oxford) Date 2023 Abstract Wave breaking is the main mechanism that dissipates energy from ocean waves by wind. Its effects on the frequency spectrum cause a downshift of the spectral peak and dissipation of the total energy of the spectrum. Various reduced-form wave breaking models have been developed to capture wave breaking in envelope-based wave evolution equations for perturbed plane-wave systems, but their applicability to waves with a continuous spectrum has not been examined. In this paper we perform modified nonlinear Schrödinger equation simulations to study four existing wave breaking models and compare the results with new experimental data for breaking unidirectional wave groups. We first compare the different wave breaking models for perturbed plane-wave simulations and then examine their potential extension to waves with a continuous spectrum. We find that most existing models are able to model breaking in perturbed plane waves, but none produce the correct spectral dissipation for focused wave groups. We propose a modification to the breaking model by Kato and Oikawa [J. Phys. Soc. Jpn. 64, 4660 (1995)0031-901510.1143/JPSJ.64.4660] in order to model breaking in focused wave groups. The modified model incorporates both a breaking criterion, which activates and deactivates the dissipation term proposed by Kato and Oikawa, and a heuristic spectral weighting function that is obtained by fitting to experimental data. The modified model also predicts breaking in perturbed plane waves well. To reference this document use: http://resolver.tudelft.nl/uuid:c20567fd-4abe-4995-b7dd-df5f151f96f1 DOI https://doi.org/10.1103/PhysRevFluids.8.054803 ISSN 2469-990X Source Physical Review Fluids, 8 (5) Part of collection Institutional Repository Document type journal article Rights © 2023 Yuxuan Liu, D. Eeltink, Tianning Tang, D. Barratt, Ye Li, T. A.A. Adcock, T.S. van den Bremer Files PDF PhysRevFluids.8.054803.pdf 5.46 MB Close viewer /islandora/object/uuid:c20567fd-4abe-4995-b7dd-df5f151f96f1/datastream/OBJ/view