Abstract
Results from large-eddy simulations of a classical hydraulic jump at inlet Froude number two are reported. The computations were performed using the general-purpose finite-volume-based code OpenFOAM®, and the primary goal was to evaluate the influence of the modelling parameters on the predictive accuracy, as well as establish the associated best-practice guidelines. A benchmark simulation was conducted on a grid with a 1 mm-cell-edge length to validate the solver and provide a reference solution for the parameter influence study. The remaining simulations covered different selections of the modelling parameters: geometric vs. algebraic interface capturing, three mesh resolution levels, and four choices of the convective flux interpolation scheme. Geometric interface capturing led to better accuracy, but deteriorated the numerical stability and increased the simulation times. Interestingly, numerical dissipation was shown to systematically improve the results, both in terms of accuracy and stability. Strong sensitivity to the grid resolution was observed directly downstream of the toe of the jump.
Highlights
A hydraulic jump is an abrupt change in the water depth accompanying the transition of the flow from supercritical to subcritical
This article presented the results from an extensive simulation campaign studying the effects of different modelling parameters on the accuracy of large-eddy simulation (LES) of classical” hydraulic jump (CHJ) flow at Fr1 = 2
The simulations were performed with a general-purpose finite-volume-based CFD code, making the obtained results relevant for industry professionals and researches alike
Summary
A hydraulic jump is an abrupt change in the water depth accompanying the transition of the flow from supercritical to subcritical. This transition causes energy dissipation, which defines the application of hydraulic jumps in engineering. According to [1], hydraulic jumps are the most commonly used energy dissipators in hydraulic structures. The hydraulic jump is a natural environmental phenomenon, occurring in rivers and bays. This motivates the significant attention this class of flows has received from the scientific community. Most works focuses on the so-called “classical” hydraulic jump (CHJ), which occurs in a smooth horizontal rectangular channel
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
