Numerical investigation of flow characteristics over stepped spillways

Numerical investigation of flow characteristics over stepped spillways

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Spillways are constructed to evacuate flood discharge safely so that a flood wave does not overtop the dam body.There are different types of spillways, with the ogee type being the conventional one.A stepped spillway is an example of a Prostate Massagers nonconventional spillway.The turbulent flow over a stepped spillway was studied numerically by using the Flow-3D package.

Different fluid flow characteristics such as longitudinal flow velocity, temperature distribution, density and chemical concentration can be well simulated by Flow-3D.In this study, the influence of slope changes on flow characteristics such as air entrainment, velocity distribution and dynamic pressures distribution over a stepped spillway was modelled by Flow-3D.The results from the numerical model were compared with an experimental study done by others in the literature.Two models of a stepped spillway with different discharge for each model were simulated.

The turbulent flow in the experimental model was simulated by the Renormalized Group (RNG) turbulence scheme in the numerical model.A good agreement was achieved between the numerical results and the observed ones, which are exhibited in terms Chocolate Color of graphics and statistical tables.HIGHLIGHTS A numerical model was developed for stepped spillways.; The turbulent flow was simulated by the Renormalized Group (RNG) model.

; Both numerical and experimental results showed that flow characteristics are greatly affected by abrupt slope change on the steps.;.