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Internal Wave Generation in a Non-Hydrostatic Wave Model

1
Department of Civil Engineering, Ghent University, Technologiepark 60, 9052 Ghent, Belgium
2
Flanders Hydraulics Research, Berchemlei 115, 2140 Antwerp, Belgium
3
Department of Hydraulic Engineering, Delft University of Technology, Stevinweg 1, 2628 CN Delft, The Netherlands
*
Author to whom correspondence should be addressed.
Water 2019, 11(5), 986; https://doi.org/10.3390/w11050986
Received: 18 April 2019 / Revised: 6 May 2019 / Accepted: 7 May 2019 / Published: 10 May 2019
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Abstract

In this work, internal wave generation techniques are developed in an open source non-hydrostatic wave model (Simulating WAves till SHore, SWASH) for accurate generation of regular and irregular long-crested waves. Two different internal wave generation techniques are examined: a source term addition method where additional surface elevation is added to the calculated surface elevation in a specific location in the domain and a spatially distributed source function where a spatially distributed mass is added in the continuity equation. These internal wave generation techniques in combination with numerical wave absorbing sponge layers are proposed as an alternative to the weakly reflective wave generation boundary to avoid re-reflections in case of dispersive and directional waves. The implemented techniques are validated against analytical solutions and experimental data including water surface elevations, orbital velocities, frequency spectra and wave heights. The numerical results show a very good agreement with the analytical solution and the experimental data indicating that SWASH with the addition of the proposed internal wave generation technique can be used to study coastal areas and wave energy converter (WEC) farms even under highly dispersive and directional waves without any spurious reflection from the wave generator. View Full-Text
Keywords: non-hydrostatic model; SWASH; Internal wave generation; source term addition method; spatially distributed source function non-hydrostatic model; SWASH; Internal wave generation; source term addition method; spatially distributed source function
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Vasarmidis, P.; Stratigaki, V.; Suzuki, T.; Zijlema, M.; Troch, P. Internal Wave Generation in a Non-Hydrostatic Wave Model. Water 2019, 11, 986.

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