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Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways

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Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways

Content Provider	Springer Nature Link
Author	Bombardelli, Fabián A. Meireles, Inês Matos, Jorge
Copyright Year	2010
Abstract	We present and discuss the results of a comprehensive study addressing the non-aerated region of the skimming flow in steep stepped spillways. Although flows in stepped spillways are usually characterized by high air concentrations concomitant with high rates of energy dissipation, the non-aerated region becomes important in small dams and/or spillways with high specific discharges. A relatively large physical model of such spillway was used to acquire data on flow velocities and water levels and, then, well-resolved numerical simulations were performed with a commercial code to reproduce those experimental conditions. The numerical runs benefited from the ability of using multi-block grids in a Cartesian coordinate system, from capturing the free surface with the TruVOF method embedded in the code, and from the use of two turbulence models: the $${k{-}\varepsilon}$$ and the RNG $${k{-}\varepsilon}$$ models. Numerical results are in good agreement with the experimental data corresponding to three volumetric flow rates in terms of the time-averaged velocities measured at diverse steps in the spillway, and they are in very satisfactory agreement for water levels along the spillway. In addition, the numerical results provide information on the turbulence statistics of the flow. This work also discusses important aspects of the flow, such as the values of the exponents of the power-law velocity profiles, and the characteristics of the development of the boundary layer in the spillway.
Starting Page	263
Ending Page	288
Page Count	26
File Format	PDF
ISSN	15677419
Journal	Environmental Fluid Mechanics
Volume Number	11
Issue Number	3
e-ISSN	15731510
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-08-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Stepped spillway Non-aerated flow Multi-phase flows Two-phase flows Experimental data Back-flushing Pitot tube Conductivity probe Numerical simulations Computational fluid dynamics (CFD) Turbulence modeling $${k{-}\varepsilon}$$ model RNG $${k{-}\varepsilon}$$ model Environmental Physics Oceanography Hydrogeology Meteorology/Climatology Mechanics
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Water Science and Technology

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