Piston vs flap to generate waves

What is the difference and advantages/disadvantages of using a piston instead of flap to generate waves?


  • The piston-type wave generation is preferred usually for shallow water (depth =< 0.05 wavelength) conditions or intermediate water conditions when the trajectory described by the water particles is a very flattened ellipse which results in a almost uniform velocity distribution along the water depth. To move all water particles along a vertical column with a uniform velocity, a piston is the ideal choice.
    For deep water conditions or conditions very close to deep water, the water particles move along a circular or elliptic orbit that reduces gradually from the free surface to the bottom. Therefore, a flap-type generation is a better choice.
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