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LES and DES of Swirling Flow with Rotor-Stator Interaction

  • Ardalan JavadiEmail author
  • Håkan Nilsson
Conference paper
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 130)

Abstract

A highly swirling turbulent flow engendered by the rotor-stator interaction of a swirl generator is investigated using LES and DES. The delayed DES Spalart-Allmaras (DDES-SA), improved DDES-SA, shear stress transport DDES (DDES-SST) and a dynamic k-equation LES are studied. A mesh sensitivity study is performed on the hybrid methods, including the ability to capture the details of the flow field. It is shown that all the methods are capable of predicting the large-scale flow features, e.g. the vortex breakdown and the corresponding on-axis recirculation region. It is also shown that all the hybrid methods capture most of the small-scale coherent structures, even with a relatively coarse mesh resolution. The various shielding functions of the hybrid methods are analyzed, distinguishing the location of the transition between RANS and LES mode.

Keywords

Guide Vane Draft Tube Vortex Breakdown Computational Fluid Dynamic Code Swirl Number 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The research presented was carried out as a part of the “Swedish Hydropower Centre—SVC”. SVC is established by the Swedish Energy Agency, Elforsk and Svenska Kraftnät together with Luleå University of Technology, The Royal Institute of Technology, Chalmers University of Technology and Uppsala University, www.svc.nu. The computational facilities are provided by C\(^{3}\)SE, the center for scientific and technical computing at Chalmers University of Technology, and SNIC, the Swedish National Infrastructure for Computing.

References

  1. 1.
    Beaudoin, M., Jasak, H.: Development of a generalized grid interface for turbomachinery simulation with OpenFOAM. In: Open Source CFD International Conference, Berlin, Germany (2008)Google Scholar
  2. 2.
    Bosioc, A.I., Resiga, R., Muntean, S., Tănasă, C.: Unsteady pressure analysis of a swirling flow with vortex rope and axial water injection in a discharge cone. J. Fluid. Eng.-T ASME 134, 081104-1 (2012)Google Scholar
  3. 3.
    Gritskevich, M.S., Garbaruk, A.V., Schütze, J., Menter, F.L.: Development of DDES and IDDES formulations for the k-\(\omega \) shear stress transport model. Flow Turbul. Combust. 88, 431–449 (2012)CrossRefzbMATHGoogle Scholar
  4. 4.
    Gyllenram, W., Nilsson, H., Davidson, L.: On the failure of the quasi-cylindrical approximation and the connection to the vortex breakdown in turbulent swirling flow. Phys. Fluids 19(4), 045108 (2007). doi: 10.1063/1.2717724 CrossRefGoogle Scholar
  5. 5.
    Gyllenram, W., Nilsson, H.: Design and validation of a scale-adaptive filtering technique for LRN turbulence modeling of unsteady flow. J. Fluid Eng.-T ASME 130(5), 051401 (2008)CrossRefGoogle Scholar
  6. 6.
    Hunt, J.C.R., Wray, A., Moin, P.: Eddies, stream, and convergence zones in turbulent flows. In: Center for Turbulence Research Report CTR-S88 (1988)Google Scholar
  7. 7.
    Jasak, H.: Error analysis and estimation for the finite volume method with applications to fluid flows. Ph.D. thesis, Imperial College, University of London (1996)Google Scholar
  8. 8.
    Javadi, A., Bosioc, A., Nilsson, H., Muntean, S., Resiga, S.R.: Velocity and pressure fluctuations induced by the precessing helical vortex in a conical diffuser. In: 27th IAHR Symposium on Hydraulic Machinery and Systems, Montreal, Canada (2014)Google Scholar
  9. 9.
    Kim, W.W., Menon, S.: A new dynamic one-equation subgrid-scale model for large eddy simulations. In: AIAA Paper, Reno, NV (1995)Google Scholar
  10. 10.
    Leibovich, S.: Vortex stability and breakdown: survey and extension. AIAA J. 22, 1192–1206 (1984)CrossRefGoogle Scholar
  11. 11.
    Menter, F.R.: Two-equation eddy-viscosity turbulence models for engineering applications. AIAA J. 32(8), 1598–1605 (1994)CrossRefGoogle Scholar
  12. 12.
    Nilsson, H., Page, M., Beaudoin, M., Gschaider, B., Jasak, H.: The OpenFOAM turbomachinery working-group and conclusion from the turbomachinery session of the 3rd OpenFOAM workshop. In: IAHR, 24th Symposium on Hydraulic Machinery and Systems, Foz do Iguassu, Brazil (2008)Google Scholar
  13. 13.
    Resiga S.R., Muntean, S., Bosioc, A.: Blade design for swirling flow generator. In: Proceedings 4th German-Romanian Workshop on Turbomachinery Hydrodynamics. GROWTH-4, Stuttgart, Germany (2008)Google Scholar
  14. 14.
    Resiga, S.R., Muntean, S.: Decelerated swirling flow control in the discharge cone of Francis turbine. In: 4th International Symposium on Fluid Machinery and Fluid Engineering, Beijing, China (2008)Google Scholar
  15. 15.
    Shtern, V., Hussain, F.: Collapse, symmetry, breaking, and hysteresis in swirling flow. Annu. Rev. Fluid Mech. 31, 537–566 (1999)CrossRefMathSciNetGoogle Scholar
  16. 16.
    Shur, M.L., Spalart, P.R., Strelets, M.K., Travin, A.K.: A hybrid RANS-LES approach with delayed-DES and wall-modelled LES capabilities. Int. J. Heat Fluid Flow 29, 1638–1649 (2008)Google Scholar
  17. 17.
    Spalart, P.R., Allmaras, S.R.: A one-equation turbulence model for aerodynamic flows. AIAA Paper, 92-0439 (1992)Google Scholar
  18. 18.
    Spalart, P.R., Deck, S., Shur, M.L., Squires, K.D., Strelets, M.K., Travin, A.K.: A new version of detached-eddy simulation, resistant to ambiguous grid densities. Theoret. Comput. Fluid Dyn. 20(3), 181–195 (2006)CrossRefzbMATHGoogle Scholar
  19. 19.
    Spalding, D.B.: A single formula for the law of the wall. J. Appl. Mech. 28(3), 455–458 (1961)CrossRefzbMATHGoogle Scholar
  20. 20.
    Tănasă, C., Resiga, R.S., Muntean, S., Bosioc, A.: Flow-feedback method for mitigating the vortex rope in decelerated swirling flows. J. Fluids Eng. 135(6), 061304 (2013)CrossRefGoogle Scholar

Copyright information

© Springer International Publishing Switzerland 2015

Authors and Affiliations

  1. 1.Division of Fluid DynamicsChalmers University of TechnologyGothenburgSweden

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