Internal solitary wave has been observed with different modes in the oceans, and mode-2 ISW is significant. In order to study the spatiotemporal variations while a mode-2 ISW in different amplitudes propagating over a pseudo slope-shelf, a finite volume is employed to solve the Navier-Stokes equations using IDDES model for the turbulent closure. Numerical results exhibit the PacMan phenomenon when a steady and symmetric waveform of a mode-2 ISW propagates in deep water. Moreover, a series of mode-2 ISWs generates on a flat bottom with amplitude decreasing during wave transmission. As waves encounter with the front slope of a submerged obstacle, the interaction induces unstable flow field and leads to the separation of wave crest from its leading wave. For the evolution of wave amplitude, the decrease of the leading trough is more obvious than that of the leading crest. However, the vorticity dissipation of the former is less than that of the latter. Not like a mode-1 ISW occurring hydraulic jump on the front slope, a mode-2 ISW separates on the front face of a slope-shelf.
關聯:
International Society of Offshore and Polar Engineers, 796-803
