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?

 

[Huyen401]

It is possible that group velocity could be affecting the waves generated by the paddle, but it would depend on the specific characteristics of the waves and the paddle's oscillation. Group velocity is the speed at which the group of waves as a whole moves, and it is affected by factors such as wave period, wavelength, and water depth. If the paddle's oscillation is causing a variation in these factors, then it could potentially impact the group velocity and therefore the overall behavior of the waves. However, it is also possible that other factors, such as wave breaking and reflection, are having a greater influence on the waves. Without more specific information about your numerical wave tank and the paddle's oscillation, it is difficult to say for sure whether group velocity is a significant factor in this case.