First of all I think you must define in which topic you are interested in particular regarding the very broad field of wave energy; mechanical, environmental, fluid mechanics, coastal impacts etc.
Then I would suggest you to conduct a bibliographic research to see the current state of the art in the particular topic you are mostly interested.
When you specify a research gap in the existing bibliography, I think you can start working on a Thesis.
Please, find attached a couple of good references (both are CFD studies done as part of undergraduate theses) for you to start with, about generation of electric energy with tidal turbines:
"Computational Fluid Dynamics study of a vertical axis tidal turbine using a Fluid Structure Interaction approach", available in: http://hdl.handle.net/2099.1/24449
"Computational Fluid Dynamics study of 2D vertical axis turbines for application to wind and tidal energy production", available in: http://hdl.handle.net/2099.1/24458
Wave power is the transport of energy by wind waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water (into reservoirs). A machine able to exploit wave power is generally known as a wave energy converter
Wave power is the transport of energy by wind waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water (into reservoirs). A machine able to exploit wave power is generally known as a wave energy converter
Wave power is the transport of energy by wind waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water (into reservoirs). A machine able to exploit wave power is generally known as a wave energy converter (WEC).
Wave power is distinct from the diurnal flux of tidal power and the steady gyre of ocean currents. Wave-power generation is not currently a widely employed commercial technology, although there have been attempts to use it since at least 1890. In 2008, the first experimental wave farm was opened in Portugal, at the Aguçadoura Wave Park.
Wave power is the transport of energy by wind waves, and the capture of that energy to do useful work – for example, electricity generation, water desalination, or the pumping of water (into reservoirs). A machine able to exploit wave power is generally known as a wave energy converter