SPH numerical investigation of the characteristics of an oscillating hydraulic jump at an abrupt drop
- 51 Downloads
This paper shows the results of the smooth particle hydrodynamics (SPH) modelling of the hydraulic jump at an abrupt drop, where the transition from supercritical to subcritical flow is characterised by several flow patterns depending upon the inflow and tailwater conditions. SPH simulations are obtained by a pseudo-compressible XSPH scheme with pressure smoothing; turbulent stresses are represented either by an algebraic mixing-length model, or by a two-equation k-ε model. The numerical model is applied to analyse the occurrence of oscillatory flow conditions between two different jump types characterised by quasi-periodic oscillation, and the results are compared with experiments performed at the hydraulics laboratory of Bari Technical University. The purpose of this paper is to obtain a deeper understanding of the physical features of a flow which is in general difficult to be reproduced numerically, owing to its unstable character: in particular, vorticity and turbulent kinetic energy fields, velocity, water depth and pressure spectra downstream of the jump, and velocity and pressure cross-correlations can be computed and analysed.
KeywordsHydraulic jumps smoothed particle hydrodynamics (SPH) models oscillating characteristics
Unable to display preview. Download preview PDF.
- Abdel Ghafar A., Mossa M., Petrillo A. Scour from flow downstream of a sluice gate after a horizontal apron [C]. 6th International Symposium on River Sedimentation-Management of Sediment-Philosophy, Aims, and Techniques, New Delhi, India, 1995, 1069–1088.Google Scholar
- De Padova D., Mossa M., Sibilla S. SPH numerical investigation of characteristics of hydraulic jumps [J]. Environmental Fluid Mechahics, 2017, https://doi.org/10.1007/s10652-017-9566-4.Google Scholar
- Liu G. R., Liu M. B. Smoothed particle hydrodynamics: A meshfree particle methods [M]. Singapore: World Scientific, 2005.Google Scholar
- De Padova D., Mossa M., Sibilla S. Laboratory experiments and SPH modelling of hydraulic jumps [C]. Proceedings of the 4th SPHERIC Workshop, Nantes, France, 2009, 255–257.Google Scholar
- De Padova D., Mossa M., Sibilla S. et al. Hydraulic jump simulation by SPH [C]. Proceedings of the 5th SPHERIC Workshop, Manchester, UK, 2010, 50–55.Google Scholar
- De Padova D., Dalrymple R. A., Mossa M. et al. An analysis of SPH smoothing function modelling a regular breaking wave [C]. Proceedings of the National Conference XXXI Convegno Nazionale di Idraulica e Costruzioni Idrauliche, Perugia, Italy, 2008.Google Scholar