Ocean wave energy has great potential to cope with increasing energy demand since it is renewable, sustainable and green energy and its overall resource is estimated to be around 2TW.
Some wave energy devices can be modeled as submerged oscillating bodies, which requires a deep understanding of hydrodynamic interaction between ocean waves and submerged bodies.
Many numerical methods have been proposed for bodies in irregular or arbitrary shapes, but it is important to specify boundary conditions on a virtual cylindrical surface between mean free surface and seabed.
Rim Un Ryong, a researcher at the Faculty of Shipbuilding and Ocean Engineering, has investigated three-dimensional linear interaction between a submerged oscillating body in arbitrary shape and the regular water wave with finite depth.
First, he derived an exact Dirichlet-to-Neumann (DtN) boundary condition on a virtual cylindrical surface, where the virtual surface was chosen to enclose the body and extract an interior subdomain with finite volume from the horizontally unbounded water domain.
Then, he applied the DtN boundary condition to solve the interaction between the body and the linear wave in the interior subdomain with the boundary integral equation.
He has validated the proposed method via a submerged vertical cylinder. The result shows a good agreement with the analytical results of precedent papers.
For more information, please refer to his paper “Free surface wave interaction with a submerged body using a DtN boundary condition” in “Theoretical and Computational Fluid Dynamics” (SCI).