Hydrodynamic loading conditions consisted of currents with a magnitude of 1.0 m/s that linearly decreases with depth and irregular waves with a significant wave height of 8.01 m and a peak period of 12.52 s. These values were chosen according to the design wave conditions for the vicinity of Ulsan, Korea over a 10-year return period (http://www.kiost.ac). An inline combination of both waves and current was also considered. Irregular wave loading conditions were assumed to be a linear superposition of waves creating an irregular profile () as a function of space (x) and time (t) such that,