Flow Structures Induced by a Solitary Wave Propagating Over a Submerged Horizontal Plate
Spatial-temporal variations of velocity field and vortices induced by a solitary wave propagating over a submerged horizontal plate is investigated experimentally in a 2D wave flume. Particle image velocimetry technique (PIV) is used to measure the velocity fields quantitively while the vorticity fields are calculated based on the measured velocities. The experimental results indicate that vortices can be induced during the solitary wave passing over the plate. At the weather-side of the plate, a series of vortices above the plate can be generated before the crest passing over the weather-side edge mainly due to flow separation. After the crest passing by, a vortex with larger size is generated at the bottom of the plate and then it is pushed upstream by an unsteady reverse flow corresponding to the deceleration of the external flow. At the lee-side of the plate, a phenomenon of vortex shedding downstream and by a turbulent jet is observed. Eventually, a pair of depth-scale vortex dipole can be generated and dissipated gradually. The nondimensional vortex intensity generated due to flow separation is also discussed and presented to be approximately linearly associated with the local Reynolds number.
KeywordsSubmerged horizontal plate Solitary waves Particle image velocimetry (PIV) Flow visualization Vortex generation
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This research is supported financially by the Natural Science Foundation of China (Grant No. 51679031, 51720105010), Liaoning Revitalization Talents Program: XLYC1807010 and High-Tech Ship Research Projects Sponsored by the Ministry of Industry and Information Technology (MIIT) of China (Grant No. 2016-23-7).
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