Internal wave generation in a non-hydrostatic wave model

Vasarmidis, Panagiotis; Stratigaki, Vasiliki; Suzuki, T.; Zijlema, Marcel; Troch, Peter

doi:10.3390/w11050986

Internal wave generation in a non-hydrostatic wave model

Title

Internal wave generation in a non-hydrostatic wave model

Author

Vasarmidis, Panagiotis (Universiteit Gent)
Stratigaki, Vasiliki (Universiteit Gent)
Suzuki, T. (TU Delft Environmental Fluid Mechanics; Flanders Hydraulics Research)
Zijlema, Marcel (TU Delft Environmental Fluid Mechanics)
Troch, Peter (Universiteit Gent)

Date

2019

Abstract

In this work, internal wave generation techniques are developed in an open source non-hydrostatic wave model (SimulatingWAves 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 functionwhere 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.

Subject

Internal wave generation
Non-hydrostatic model
Source term addition method
Spatially distributed source function
SWASH

To reference this document use:

http://resolver.tudelft.nl/uuid:7c1b463e-5756-49e2-a5b3-e1cd63652546

DOI

https://doi.org/10.3390/w11050986

ISSN

2073-4441

Source

Water, 11 (5)

Part of collection

Institutional Repository