Group velocity for regular waves generated in deep water

Cluain

Does group velocity effect long linear waves generated by a paddle generating waves in deep water?
I have developed a numerical wave tank in CFD at full scale, using a bottom hinged flap paddle that oscillates to produce regular waves, the domain is roughly three wavelengths long, and a beach is provided at the end to dissipate the energy by wave breaking and prevent reflection.
The paddle oscillates with a constant period and amplitude, to create water waves of a corresponding period and amplitude. The generated waves do not appear to be quite constant and I was wondering if group velocity was affecting them or if group velocity is not relevant in this case.

olivermsun

If they are true deep water waves, then yes there is dispersion and hence there is a distinct group velocity. But what do you mean the generated waves are not quite constant? Do you have a plot?