- Wave Energy Conversion
Ocean waves are considered as one of promising renewable energy resources based on the highest energy density among renewable energy sources and constant availability. A number of permanent magnet linear generators have been designed to generate electricity out of the ocean wave energy. The linear generator generates electricity from the relative motion of two bodies, an armature (coil part) and a permanent magnet. The purpose of this research is to develop a fully coupled numerical simulation program including hydrodynamics, mooring dynamics, and generator dynamics.
- Submerged Floating Tunnel
The submerged floating tunnel, which is also known as Archimedes Bridge, is an innovating structure to solve the limitation of transportation in a waterway. The submerged floating tunnel is fundamentally consisted of a tunnel, which is floating in water with positive net buoyancy, and an anchor system using bars and/or cables to locate the tunnel in a suitable water depth.
The submerged floating tunnel with an appropriate design can be better than a traditional immersed tunnel or a bridge. While the traditional immersed tunnel is small dynamic responses against the wave load, it is sensitive to the seismic load. In contrast, the submerged floating tunnel is prone to experience a significant dynamic response from the wave load; however, it can provide a much safer condition against the seismic load. Moreover, the significant dynamic response induced by the wave load can be minimized by properly adjusting several factors such as a buoyancy-weight ratio, water depth, and the mooring-line configuration. In case of a bridge, the length of a bridge can be limited due to gravity, and other factors such as the location where ship passes can restrict the construction of a bridge. The length of the SFT can be long, and an issue related to ship traffic is less sensitive with a 25-30 m clearance from the mean water level. The purpose of this research is to achieve a better global performance for given environmental conditions through numerical simulations.
J.Y. Lee, CK Jin, and M.H. Kim, “Dynamic response analysis of submerged floating tunnels by wave and seismic excitations” (submitted to ocean systems engineering)
H.Y. Kang, C.K. Jin, M.H. Kim, J.R. Kim, and I.H. Cho, (2016). “Comparative study of permanent magnet linear generator for wave energy conversion,” Proceedings of the 26th International Ocean and Polar Engineering Conference, 597-601.
C.K. Jin, J.Y. Lee, H.S. Kim, and M.H. Kim, “Dynamic response of the submerged floating tunnel in Hydrodynamic and seismic excitation,” (submitted to the 27th International Ocean and Polar Engineering Conference.)