PIV技术用于新型波动的产生
We present the results of a combined experimental and numerical study of thegeneration of internal waves using the novel internal wave generator design ofGostiaux et al. (Exp. Fluids, vol. 42, 2007, pp. 123–130). This mechanism, whichinvolves a tunable source composed of oscillating plates, has so far been used for afew fundamental studies of internal waves, but its full potential is yet to be realized.Our study reveals that this approach is capable of producing a wide variety of twodimensionalwave fields, including plane waves, wave beams and discrete verticalmodes in finite-depth stratifications. The effects of discretization by a finite numberof plates, forcing amplitude and angle of propagation are investigated, and it is foundthat the method is remarkably efficient at generating a complete wave field despiteforcing only one velocity component in a controllable manner. We furthermore findthat the nature of the radiated wave field is well predicted using Fourier transformsof the spatial structure of the wave generator.