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Simulation of a density current turbulent flow employing different RANS models: a comparison study

Mehdizadeh, A ; Sharif University of Technology | 2009

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  1. Type of Document: Article
  2. Publisher: 2009
  3. Abstract:
  4. The accuracy of Reynolds Averaged Navier-Stokes (RANS) turbulence models to predict the behavior of 2-D density currents has been examined. In this work, a steady density current is simulated by the k - ε, k - ε RNG, two-layer k - ε and modified v̄2 - f model, all of which are compared with the experimental data. Density currents, with a uniform velocity and concentration, enter a channel via a sluice gate into a lighter ambient fluid and move forward down-slope. The eddy-viscosity concept cannot accurately simulate this flow because of two stress production structures found within it. Results show that all isotropic models have a weak outcome on this current, but by improving the ability of the models, the results will improve. © Sharif University of Technology, February 2009
  5. Keywords:
  6. κ-ε RNG ; Density current ; Modified v̄2-f ; Turbulence models ; Two-layer κ-ε ; Flow simulation ; Navier Stokes equations ; A densities ; Comparison studies ; Eddy viscosities ; Experimental datum ; Isotropic models ; Stress productions ; Channel flow ; Comparative study ; Computational fluid dynamics ; Computer simulation ; Eddy ; Experimental study ; Flow modeling ; Navier-Stokes equations ; Reynolds number ; Turbulent flow ; Accuracy assessment ; Numerical model ; A-density ; Ambient fluids ; Comparison study ; Density currents ; Eddy viscosity ; Experimental data ; Reynolds-averaged Navier-Stokes ; Sluice gates ; Stress production ; Two layers
  7. Source: Scientia Iranica ; Volume 16, Issue 1 , 2009 , Pages 53-63 ; 10263098 (ISSN)
  8. URL: http://scientiairanica.sharif.edu/article_2990.html