International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Unsteady Simulations of the Flow in a Swirl Generator, Using OpenFOAM

  • Petit, Olivier (Division of Fluid Mechanics, Chalmers University of Technology) ;
  • Bosioc, Alin I. (Department of Hydraulic Machinery, "Politehnica" University of Timisoara) ;
  • Nilsson, Hakan (Division of Fluid Mechanics, Chalmers University of Technology) ;
  • Muntean, Sebastian (Centre of Advanced Research in Engineering Sciences, Romanian Academy - Timisoara Branch) ;
  • Susan-Resiga, Romeo F. (Department of Hydraulic Machinery, "Politehnica" University of Timisoara)
  • Accepted : 2011.03.07
  • Published : 2011.03.31
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Abstract

This work presents numerical results, using OpenFOAM, of the flow in the swirl flow generator test rig developed at Politehnica University of Timisoara, Romania. The work shows results computed by solving the unsteady Reynolds Averaged Navier Stokes equations. The unsteady method couples the rotating and stationary parts using a sliding grid interface based on a GGI formulation. Turbulence is modeled using the standard k-${\varepsilon}$ model, and block structured wall function ICEM-Hexa meshes are used. The numerical results are validated against experimental LDV results, and against design velocity profiles. The investigation shows that OpenFOAM gives results that are comparable to the experimental and design profiles. The unsteady pressure fluctuations at four different positions in the draft tube is recorded. A Fourier analysis of the numerical results is compared whit that of the experimental values. The amplitude and frequency predicted by the numerical simulation are comparable to those given by the experimental results, though slightly over estimated.

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References

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