Pneumatic Effect of Nonlinear Waves and a Freely Floating Body Simulation by a 2D Fully Nonlinear Numerical Wave Tank (NWT)
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A 2D fully nonlinear Numerical Wave Tank (NWT) is developed based on potential theory, Boundary Element Method (BEM)/Constant Panel Method (CPM), MEL-nonlinear free surface treatment, and Runge-Kutta 4th-order (RK4) timemarching scheme. The inner pneumatic chamber is modeled by the volumedependent pressurized air and its flow through outlet causing damping. Using the developed 2D NWT, the damping effect of the pneumatic floating breakwater was simulated and its wave-blocking performance is assessed against various damping coefficients. The developed NWT was utilized to investigate the variation of transmission coefficients for various kinds of mooring and wave conditions. It is seen that a significant damping effect can be achieved up to 50% if the breakwater is stationary. When the breakwater is floating against incident waves, the maximum transmission coefficient reduction ratio is much smaller since the floating body tends to follow the vertical motion of incident waves and the resulting volume-change effect is small. The fully nonlinear simulations are also compared with linear ones.
