caa a22 4500 445874600 CHVBK 20180317145524.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10652-010-9188-6 doi (NATIONALLICENCE)springer-10.1007/s10652-010-9188-6 Laboratory measurements and multi-block numerical simulations of the mean flow and turbulence in the non-aerated skimming flow region of steep stepped spillways [Elektronische Daten] [Fabián Bombardelli, Inês Meireles, Jorge Matos] 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. The Author(s), 2010 Stepped spillway nationallicence Non-aerated flow nationallicence Multi-phase flows nationallicence Two-phase flows nationallicence Experimental data nationallicence Back-flushing Pitot tube nationallicence Conductivity probe nationallicence Numerical simulations nationallicence Computational fluid dynamics (CFD) nationallicence Turbulence modeling nationallicence $${k{-}\varepsilon}$$ model nationallicence RNG $${k{-}\varepsilon}$$ model nationallicence Bombardelli Fabián Department of Civil and Environmental Engineering, University of California, Davis, 2001 Ghausi Hall, One Shields Ave., 95616, Davis, CA, USA aut Meireles Inês Department of Civil and Environmental Engineering, University of California, Davis, 2001 Ghausi Hall, One Shields Ave., 95616, Davis, CA, USA aut Matos Jorge Department of Civil Engineering and Architecture, IST, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal aut Environmental Fluid Mechanics Springer Netherlands 11/3(2011-06-01), 263-288 1567-7419 11:3<263 2011 11 10652 https://doi.org/10.1007/s10652-010-9188-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10652-010-9188-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bombardelli Fabián Department of Civil and Environmental Engineering, University of California, Davis, 2001 Ghausi Hall, One Shields Ave., 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Meireles Inês Department of Civil and Environmental Engineering, University of California, Davis, 2001 Ghausi Hall, One Shields Ave., 95616, Davis, CA, USA aut NATIONALLICENCE 700 1- Matos Jorge Department of Civil Engineering and Architecture, IST, Technical University of Lisbon, Av. Rovisco Pais, 1049-001, Lisbon, Portugal aut NATIONALLICENCE 773 0- Environmental Fluid Mechanics Springer Netherlands 11/3(2011-06-01), 263-288 1567-7419 11:3<263 2011 11 10652 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer