Hydraulic Jump Dynamics and Air-Water Flow Properties
Summary
Hydraulic jumps occur when fast, shallow supercritical flow transitions abruptly to slower, deeper subcritical flow, dissipating excess energy through turbulent mixing, vortical rollers and strong air entrainment. This phenomenon underpins the design of stilling basins, spillways and energy-dissipating structures in hydraulic engineering. The interplay between water turbulence and air bubbles governs pressure distributions, cavitation risk and ventilation performance in high-velocity discharge channels. Recent advances in experimental velocimetry and non-intrusive optical methods have revealed three-dimensional flow structures and transient bubble patterns within the roller region, while high-fidelity computational fluid dynamics (CFD) and large eddy simulation (LES) have provided detailed insight into turbulence scales and phase interactions. Improved understanding of air–water flow properties informs the mitigation of vibration, noise and erosion in flood tunnels and bottom outlets, and supports the optimisation of aeration devices to protect gate machinery and downstream environments. Ongoing research aims to integrate data-driven models with physical simulation to predict jump location, energy loss and bubble distribution under variable inflow conditions, thereby enhancing the resilience and efficiency of hydraulic infrastructure worldwide.
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Hydraulic Jump Dynamics and Air-Water Flow Properties publication trend
The graph below shows the total number of articles in hydraulic jump dynamics and air-water flow properties across all publications each year (not limited to Nature Index journals).
Technical terms
Hydraulic jump: Sudden transition from supercritical to subcritical flow marked by energy dissipation and intense mixing.
Froude number (Fr): Dimensionless ratio of flow inertia to gravitational forces, defining flow regimes.
Air entrainment: Incorporation of air into water flow, forming bubbles that influence pressure and turbulence.
Self-aeration: Process by which high-velocity spillway flow naturally entrains air without external aerators.
Turbulent kinetic energy (TKE): Measure of energy contained in turbulent fluctuations, governing mixing intensity.
References
- Effects of Air Vent Size and Location Design on Air Supply Efficiency in Flood Discharge Tunnel Operations. Journal of Hydraulic Engineering (2023).
- Numerical Simulations of the Flow Field of a Submerged Hydraulic Jump over Triangular Macroroughnesses. Water (2021).
- Numerical Simulation of Air–Water Two-Phase Flow on Stepped Spillways Behind X-Shaped Flaring Gate Piers under Very High Unit Discharge. Water (2019).
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