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Triadic resonant instability in confined and unconfined axisymmetric geometries. (English) Zbl 1508.76047

Summary: We present an investigation of the resonance conditions governing triad interactions of cylindrical internal waves, i.e. Kelvin modes, described by Bessel functions. Our analytical study, supported by experimental measurements, is performed both in confined and unconfined axisymmetric domains. We are interested in two conceptual questions: can we find resonance conditions for a triad of Kelvin modes? What is the impact of the boundary conditions on such resonances? In both the confined and unconfined cases, we show that sub-harmonics can be spontaneously generated from a primary wave field if they satisfy at least a resonance condition on their frequencies of the form \(\omega_0 = \pm\omega_1\pm\omega_2\). We demonstrate that the resulting triad is also spatially resonant, but that the resonance in the radial direction may not be exact in confined geometries due to the prevalence of boundary conditions – a key difference compared with Cartesian plane waves.

MSC:

76E30 Nonlinear effects in hydrodynamic stability
76B55 Internal waves for incompressible inviscid fluids
76B70 Stratification effects in inviscid fluids
76-05 Experimental work for problems pertaining to fluid mechanics
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