NUMERICAL SIMULATION OF FULLY NON-LINEAR IRREGULAR WAVE BY FLAP TYPE WAVE MAKER

Sea waves are usually irregular and of random nature. Therefore, no two waves are of the same wave height and period and move at different speeds. Investigating the effect of sea waves on offshore structures as well as absorbing energy from sea waves requires a thorough recognition of the waves and their features. Using numerical wave substrates being developed over the last two decades is an effective technique to simulate waves in different situations.For the first time Havelock (1929) [1] and Hieu (1976) [2] assuming the non-viscous flow through using linear wave theory provided an analytical solution for flap and piston wave generators. However, Ursell (1960) [3], after conducting numerous experiments and examining waves with different sharpness, showed that the height of the waves generated by the piston wave generator is 10 percent less than the values obtained from analytical solutions based on the linear theory. Inability of analytical solutions for modeling waves in solid objects led high-order numerical models be presented based on the stream function wave theory to simulate the waves.