On the oscillating characteristics of hydraulic jumps

SPH Modelling of Hydraulic Jump Oscillations at an Abrupt Drop

“…López et al, [43], investigated the capability of the SPH method to reproduce mobile hydraulic jumps with different inflow Fr. Jonsson et al [44] Some researchers pointed out the existence of oscillating phenomena, and particularly of a cyclic variation of jump types over long-lasting experiments, under specific flow conditions (e.g., [5,[7][8][9][10][11][12][13][14]). …”

“…Figure 1 summarises well acknowledged flow patterns: (1) the A-jump; (2) the wave jump or W-jump; (3) the wave train; (4) the B-jump (or maximum plunging condition) characterised by a plunging jet mechanisms; and (5) the minimum B-jump (or limited jump) with a limited hydraulic jump (e.g., [5]). Some researchers pointed out the existence of oscillating phenomena, and particularly of a cyclic variation of jump types over long-lasting experiments, under specific flow conditions (e.g., [5,[7][8][9][10][11][12][13][14]). …”

Editorial

“…://dx.doi.org/10.1680/jencm.2017.170.1.1 ICE Publishing: All rights reserved most complete investigations of the average jump profile and length, Mossa andTolve (1998), Mossa (1999)), the research on this transition flow and its related flow motions, such as tidal bore or surge, is still relevant, as shown by Wang et al (2017) in their interesting paper. In fact, the authors show that the flow structure in the roller remains a great research challenge due to large quantities of entrained air, bubble turbulence interactions and the coupling between turbulent properties and free surface deformations.…”

“…The history of its scientific study dates at least from the paper of Bidone (1820), who described the hydraulic jump with the following words: 'If, when a stream has been established in a rectangular channel … the flow of water is totally impeded by lowering a gate in any section of the channel itself, the waters thus restrained rise immediately up to a certain height against the gate and form an intumescence'. As shown by Mossa andPetrillo (2002, 2003), even if hydraulic jumps have been studied for centuries (Bidone (1820), Bélanger (1828), Guglielmini (1739), Rouse et al (1958) with their air model, Resch et al (1974), Bakhmeteff and Matzke (1936), which is one of the…”

Residence time of buoyant objects in drowning machines

“…Consider the characteristic time τ. We argue that τ is the period of a harmonic process inherent in the jump (5)(6)(7)(8). Thus τ may depend on the five variables of the jump-V (or V 0 ), h (or h 0 ), g, ρ, and μ, where ρ and μ are the density and the viscosity of the fluid, respectively.…”