Computational Modeling of the Hydraulic Jump in the Stilling Basin with Convergence Walls Using CFD Codes

Abstract

The stilling basin has been accepted to be the most powerful hydraulic structure for the dissipation of the flow energy. The size and geometry of the stilling basin affect the formation of flow patterns, which can be influential for hydraulic performance of the whole system. The Nazloo Dam in Iran was selected as the study area. The USBR II stilling basin was conducted for four convergence angles (5 • , 7.5 • , 10 • , and 12.5 • ). The convergence walls cause the jump to stabilize inside the basin and cause the energy loss to increase in the stilling basin. To simulate the hydraulic jump in the convergence stilling basin conditions in this region, a free surface computational fluid dynamics (CFD) numerical model has been applied. The commercially known software, FLOW-3D , was applied to numerically solve the Navier-Stokes equations for solution domains, namely the shout, the stilling basin and the downstream of dam, and to estimate the turbulence flow, the standard k-ε and RNG models was used. These models are based on the volume-of-fluid method, and they are capable of simulating the hydraulic jump. The calculated results such as the pressure, the velocities, the flow rate, the surface height air entranced, the kinetics energy, the kinetics energy dissipated, and the Froude number were compared with the scale model data where available. This allowed a comparison for the use of CFD as a cost-effective alternative to physical models. The physical model and CFD model results showed good correlations.

3D Hydrodynamic Modelling Enhances the Design of Tendaho Dam Spillway, Ethiopia

“…The agreement is remarkable for a field situation. Results are satisfactorily accurate, as they confirm the experimental findings from the physical models [8].…”

Numerical Model for a Nineteenth-Century Hydrometric Module

“…The water velocity decreased in the two central vessels, and the fluid accelerated in the vicinity of central weir. Turbulence was generated in the region where the hydraulic jump occurred (Babaali et al 2015). Likewise, the maximum velocity of the water outlet was at the side discharge valve, where the maximum velocity of the entire modeled regulator occurred, whereas the velocity was lowest at the exit of the sluice gate located at the first regulation manhole.…”

Farklı Akım Koşullarına Sahip Serbest Hidrolik Sıçramanın Deneysel ve Sayısal Modellemesi

“…Babaali ve ark. [8], tarafından dinlendirme havuzunda meydana gelen hidrolik sıçramanın serbest su yüzü profili Flow-3D yazılımıyla modellenmiştir. Modelleme sonucunda elde edilen hidrolik sıçramanın karakteristikleri deneysel olarak elde edilen değerlerle karşılaştırılmıştır.…”