Potential and non-potential effects in wave breaking

14 December 2020, 14:00 - 15:00 
הסמינר יתקיים בזום 
Potential and non-potential effects in wave breaking

Monday, December 14, 2020 at 14:00

Potential and non-potential effects in wave breaking

Dr. Anatoliy Khait
Centre for Mathematical Modelling and Flow Analysis
Manchester Metropolitan University, UK

Wave breaking is sufficiently two-phase transient phenomenon occurring frequently in open seas and coastal surf zones. It is of significant importance in marine engineering due to its capability to produce extreme loadings that can severely damage or completely destroy coastal defense, offshore structure and marine vessel. Recent work1 suggests importance of wave breaking in formation of rogue waves. Wave breaking also plays an important role in the atmosphere-ocean system by facilitating and enhancing the physical, chemical and biological interactions across the air-sea interface.
Complexity of wave breaking phenomenon imposes significant restrictions on applicability of analytical analysis. Turbulent energy release and air-water mixing in the ocean boundary layer suggests that high fidelity numerical simulations and laboratory experiments are the only approaches producing reliable results2-6. In this seminar, attention will be paid to breaking wave trains that demonstrate spatiotemporal evolution significantly different from theoretical predictions based on potential approximations. We will discuss recently reported effect of nonlinear phase locking7-8 induced by the wave breaking. It will be shown that breaking-generated non-stationary sheared currents9 can be responsible for modification of waves’ dispersive properties leading to suppression of the wave train defocusing. Practical importance of the findings will be discussed, which includes the impact of wave breaking on rogue waves formation, as well as required corrections to ocean waves models.

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1. M.L. McAllister, S. Draycott, T.A.A. Adcock, P.H. Taylor, T.S. van den Bremer, J. Fluid Mech., 860, (2019).
2. Z. Tian, M. Perlin, and W.J. Choi, J. Fluid Mech., 655, (2010).
3. Z. Tian, M. Perlin, and W.J. Choi, Phys. Fl., 24, (2012).
4. B.R. Seiffert, G. Ducrozet, Ocean Dynamics, 68, (2018).
5. C.C. Craciunescu, M. Christou, Appl. Ocean Res., 99, (2020).
6. A. Khait, L. Shemer, Phys. Fl., 30, (2018).
7. M. Derakhti, J.T. Kirby, J. Fluid Mech., 790, (2016).
8. A. Khait, Z. Ma, Submitted to J. Fluid Mech.
9. A. Khait, Z. Ma, L. Qian, W. Bai, Z. Lin, ISOPE 2020-TPC-0369.

About the presenter
Dr. Anatoliy Khait is a postdoctoral research associate at the Department of Computing and Mathematics at Manchester Metropolitan University. He earned his academic degrees from Ural Federal University (Russia). He attended intensive Master course at Genoa University (Italy) and Silesian University of Technology (Poland) funded by EU Tempus project. He has a substantial industrial experience working in a private design company as an engineer for hydraulic and pneumatic systems. Being a postdoctoral fellow under supervision of Prof. Lev Shemer at Tel Aviv University, Dr. Khait started research on nonlinear ocean waves dynamics combining theoretical, numerical and experimental approaches. His current research is focused on the problems of ocean aeration due to the wave breaking. He also continues research projects on various fluid dynamic and thermodynamic problems.


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