Some offshore structures, breakwaters or wave energy devices sit shallowly submerged beneath the free surface. When waves interact with such a shallow structure they can break, form bores and generate significant higher harmonic free waves in the lee of the structure. This work is motivated by the Carnegie Clean Energy CETO wave energy device, an≈25m diameter thin vertical axis cylinder which sits 2-3m submerged below the mean free surface. For surface-piercing devices, parametric studies with linear hydrodynamic models are a key tool; for shallowly submerged devices linear theory may be inadequate due to the effects described above. It is of interest to create computationally efficient models using simplified non-linear equations, that may predict the bulk flow properties adequately for parametric design studies. This work aims to assess the suitability of one such simplified numerical model for waves passing over a shallowly submerged step in 2D. The hybrid model uses linear potential flow in the deep water region and the Non-linear Shallow Water Equations (NSWE) for wave propagation in the shallow water region.
|Number of pages||4|
|Publication status||Published - 2019|
|Event||34th International Workshop on Water Waves and Floating Bodies: IWWWFB34 - Newcastle, Newcastle, Australia|
Duration: 7 Apr 2019 → 10 Apr 2019
|Conference||34th International Workshop on Water Waves and Floating Bodies|
|Period||7/04/19 → 10/04/19|
|Other||The annual meeting brings together engineers and scientists with a particular interest in water waves and their effects on floating and submerged bodies. Emphasis is placed on the participation of younger researchers, interdisciplinary discussion between engineers and scientists, and the presentation of preliminary work prior to publication. Participants will include marine hydrodynamicists, naval architects, offshore and arctic engineers and other scientists and mathematicians, who will discuss current research and practical problems.|