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Experimental wave generation in channels is usually achieved throughwavemakers (moving paddles) acting on the surface of the water. Althoughpractical for engineering purposes, wavemakers have issues: they perform poorlyin the generation of long waves and create evanescent waves in their vicinity.In this article, we introduce a framework for wave generation through theaction of an underwater multipoint mechanism: the pedal-wavemaking method. Ourmultipoint action makes each point of the bottom move with a prescribedpedalling-like motion. We analyse the linear response of waves in a uniformchannel in terms of the wavelength of the bottom action. The frameworknaturally solves the problem of the performance for long waves and replacesevanescent waves by thin boundary layer at the bottom of the channel. We alsoshow that a proper synchronisation of orbital motion on the bottom can producewaves that mimic deep water waves. This last feature has been proved to beuseful to study fluid-structure interaction in simulations based on smoothedparticle hydrodynamics.

Generation of gravity waves by pedal-wavemakers