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Particle trajectory study in submerged flows with baffles using v 2̄ - f and k -ε turbulence models

Mehdizadeh Momen, A ; Sharif University of Technology | 2008

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  1. Type of Document: Article
  2. DOI: 10.1115/1.4001557
  3. Publisher: 2008
  4. Abstract:
  5. In this paper, the structure of a wall jet deflected by a baffle along with the trajectory of particles has been studied. This baffle 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 (v2̄ - 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 proven that the v2̄ - 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 the v2̄ - f model with available experimental data. Since erosion and deposition are coupled, the study of this problem should consider both of these phenomena using a proper approach. In addition to erosion over the bed, the particles' trajectory has been studied. Using a Lagrangian-Eulerian approach, the distribution of deposited particles over the bed was predicted for a two-phase test case based on a series of numerical simulations. Results show that the maximum erosion happens in the place in which no particle can be deposited and this causes the bed to deform very rapidly in this region. This feature should help prevent or reduce erosion over the bed. On the other hand, this study helps to identify the movement of particles and the deposition rate in each section of the channel, and is basic to controlling the erosion and deposition on the bed of a channel. Copyright © 2008 by Ayyoub Mehdizadeh Momen
  6. Keywords:
  7. Complex flow ; Damping function ; Elliptic relaxation ; Erosion and deposition ; Eulerian approach ; Experimental data ; Fluid flow ; High velocity ; Lagrangian ; Near-wall ; Numerical simulation ; Particle trajectories ; Phase tests ; Submerged flow ; Super-critical ; Wall jet ; Damping ; Erosion ; Trajectories ; Turbulence models ; Flow of fluids
  8. Source: 46th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, 7 January 2008 through 10 January 2008 ; 2008 ; 9781563479373 (ISBN)
  9. URL: https://asmedigitalcollection.asme.org/fluidsengineering/article-abstract/132/5/051105/455454/Particle-Trajectory-Study-in-Submerged-Flows-With?redirectedFrom=fulltext