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Numerical Wave Channel with Absorbing Wave-maker

Wang Yong-xue (Dalian University of Technology, Dalian 116023)  
The numerical wave channel has been developed based on the volume of fluid method (VOF). The absorbing wave maker boundary on the left side of the channel is presented by prescribing velocities reference to linear wave-maker theory. The principle of which is that the paddle of wave maker is designed to move in a way that generates the required incident wave and cancels out any reflected waves that reach it at the same time. On the right side of the channel, the open boundary is set to permit incident waves to be transmitted freely. The parametric studies have been carried out at a range of ratios of wave height in front of paddle to water depth Ho/d from 0. 1 to 0. 3, with water depth/wave length ratio d/L from 0. 124 to 0. 219. Wave height, wave pressure distributions along the channel and velocity fields are obtained for both absorbing wave maker and conventional wave maker. For a reflective case, it is shown that the absorbing wave-maker is very effective in canceling out the reflected wave that reaches the numerical paddle and highly repeatable waves can be achieved.
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