MS Thesis R. Hager - Hawaii National Marine Renewable Energy ...

CHAPTER 4. NUMERICAL SIMULATIONSThe software package AQWA v.14.0 by ANSYS is used to analyze the diffraction problemfor a single, two-dimensional body impinged by a regular, harmonic, linear wave. AQWAapplies the Green Function Method to solve for hydrodynamic and hydrostatic quantities.More specifically, AQWA-LINE evaluates the linear response of a fixed body subjected toregular, linear waves using diffraction theory, as presented in Chapter 3.4.1 Numerical ProcedureAQWA is used to solve for the excitation force for 39 bodies. The excitation force iscalculated as the incident wave approaches the body from 0° and 180°. Where, the excitationforce measured as the wave impinges the body’s curved face is denoted as 0 ○ , and theexcitation force measured as the wave impinges the body’s flat face is denoted 180 ○ . Thecomplex amplitude of the excitation force is then used to calculate the radiated waveamplitude at positive and negative infinity with Eq. (58):AgCgiXi 2where, the group velocity is calculated using Eq. (33):C g 1 2kd 1k 2 sinh(2kd)Using the radiated wave amplitude at positive and negative infinity, the maximum powerabsorption efficiency is calculated with Eq. (79): 22 255