| Title |
Numerical Simulation of Hydraulic Jump |
| DOI |
https://doi.org/10.12652/Ksce.2023.43.6.0749 |
| Keywords |
도수; 천수 방정식; 정수압 가정; Weisbach 저항 계수; 근사 Riemann 해법 Hydraulic jump; Shallow water equations; Hydrostatic assumption; Weisbach resistance coefficient; Approximate Riemann solver |
| Abstract |
A depth-integrated model with an approximate Riemann solver for flux computation of the shallow water equations was applied to hydraulic jump experiments. Due to the hydraulic jump, different flow regimes occur simultaneously in a single channel. Therefore, the Weisbach resistance coefficient, which reflects flow conditions rather than the Manning roughness coefficient that is independent of depth or flow, has been employed for flow resistance. Simulation results were in good agreement with experimental results, and it was confirmed that Manning coefficients converted from Weisbach coefficients were appropriately set in the supercritical and subcritical flow reaches, respectively. Limitations of the shallow water equations that rely on hydrostatic assumptions have been revealed in comparison with hydraulic jump experiments, highlighting the need for the introduction of a non-hydrostatic shallow-water flow model. |