Hydraulics & Waterways

Oral

397650 - LES-type models for the simulation of flows past stepped spillways

Wednesday, June 6
8:30 AM - 10:00 AM
Location: Regency Room
Co-Authors: Fabian Bombardelli, USA – University of California, Davis; Joongcheol Paik, South Korea – Gangneung-Wonju National University

Several works have been presented in recent years regarding the use of LES-type, hybrid models to simulate the flow past hydraulic structures. These models serve to the purpose of providing interesting evidence on the turbulence coherent structures at a much smaller computational cost and larger Reynolds numbers than LES or DNS. These simulations have tremendous promise in providing notable insight into the mechanisms of flow.

In this work we first discuss the development of standard Reynolds-Averaged Navier-Stokes (RANS) simulations for the flow past stepped spillways using the k-epsilon model, and we compare the results to laboratory data. We make the contrast of time-averaged velocities, water depths and boundary-layer development against data. Then, results of a detached eddy simulation (DES) are presented and compared to other laboratory data containing detailed turbulence statistics. Pseudo-bottom normal distributions of time-averaged velocities, turbulent kinetic energy, boundary-layer growth, etc. This time, we provide unprecedented evidence of the flow coherent structures using the Q-criterion.

Comparisons not only highlight the power of the DES in terms of its prediction, but they also underscore the good agreement with data. Further, we show that the entrainment of air seems to be the consequence of well-organized thin tubes which interact with the free surface.

Juan Pablo Toro

Assistant Professor
Universidad Andres Bello

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397650 - LES-type models for the simulation of flows past stepped spillways



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