Development of a Hydraulic-Control Wave-Maker (Hcw) for the Study of Combined Waves and Flows

Abstract

The aim of the research presented here is to develop a new experimental device which would permit the study of multiscale and vertically-variable oceanographic flows using a system called the Hydraulic-Control Wave-maker (HCW). Both the inlet and outlet flume boundaries are composed of an adjustable set of vertical baffles. Each baffle is connected to an individual flow control system, such that the vertical distribution of flow is entirely controllable. In such a system, any arbitrary flow can be reasonably created, and different sets of baffles can be connected to different reservoirs to create vertical density profiles. In this study, before constructing the experimental device, numerical analyses to verify the method of HCW, such as its ability to generate waves are carried out. Moreover, the small physical model with one baffle connected to our own flow control system is developed by ourselves. Long and short sine wave are generated by a small-scale HCW and the snapshots are presented. In practical, thus, The possibility of system can be confirmed.

An analytical and numerical study of a vertically discretized multi-paddle wavemaker for generating free surface and internal waves

“…Conventional-type wavemakers have not been fully successful in reproducing internal waves, hence newly devised wavemakers have been proposed (e.g. Lewis et al, 1974;Kao et al, 1985;Michallet and Barthelemy, 1998;Umeyama, 2002;Ko and Lynett, 2014). Owing to its vertical flexibility to any given flow condition, the wavemaker system proposed in this study can also function as an internal wave generator.…”

“…Umeyama (2002) proposed two different wavemaker systems, i.e., an oil-pressure type wave generating pump and a horizontal flap type board to generate short and long internal waves, respectively. Most recently, Ko and Lynett (2014) has used a hydraulic-control wavemaker where separated jets force the flow in two different fluid layers.…”