Numerical simulation of submerged flows with baffles uSING ν2̄ - F and k-ε turbulence models

Mehdizadeh, A ; Sharif University of Technology | 2006

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  1. Type of Document: Article
  2. Publisher: American Society of Mechanical Engineers (ASME) , 2006
  3. Abstract:
  4. This paper introduces the concept of a submerged hydraulic jump being used for energy dissipation. A baffle wall is used to produce a stable deflected surface jet, thereby deflecting the high-velocity supercritical stream away from the bed to the surface. An elliptic relaxation turbulence model (v 2̄ - f model) has been used to simulate this submerged flow. During the last few years, the v2̄ - f turbulence model has become increasingly popular due to its ability to account for near-wall damping without use of damping functions. In addition, it has been proved that the v̄2 - f model is superior to other RANS methods in many fluid flows where complex flow features are present. In this study, we compared the results of both models with each other and with available experimental data. In addition, based on a series of numerical simulations, a diagram was developed that predicts the effect of baffle position on the friction coefficient over the bed. This feature should help preventing or reducing erosion over the bed. Moreover, we have shown that in numerical simulation, like experimental data, in some cases the flow regimes of submerged flow with baffles can either be a deflected surface jet or reattached wall jet. Copyright © 2006 by ASME
  5. Keywords:
  6. Computer simulation ; Damping ; Flow of fluids ; Hydraulic conductivity ; Turbulence models ; Erosion reduction ; Near-wall damping ; Submerged flows ; Flow measurement
  7. Source: 2006 ASME International Mechanical Engineering Congress and Exposition, IMECE2006, Chicago, IL, 5 November 2006 through 10 November 2006 ; 2006 ; 08888116 (ISSN); 0791837904 (ISBN); 9780791837900 (ISBN)
  8. URL: https://asmedigitalcollection.asme.org/IMECE/proceedings-abstract/IMECE2006/47705/463/310244