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Flow Simulation of a Francis Turbine Using the SAS Turbulence Model

In: High Performance Computing in Science and Engineering ‘13

Author

Listed:
  • Timo Krappel

    (Institute of Fluid Mechanics and Hydraulic Machinery)

  • Albert Ruprecht

    (Institute of Fluid Mechanics and Hydraulic Machinery)

  • Stefan Riedelbauch

    (Institute of Fluid Mechanics and Hydraulic Machinery)

Abstract

The operation of Francis turbines in part load conditions causes high fluctuations and dynamic loads in the turbine and the efficiency of the draft tube decreases strongly. For a better understanding of the various instantaneous phenomena, flow simulations of the complete Francis turbine are done with particular focus on the draft tube flow.The SAS (Scale Adaptive Simulation) model is used as turbulence model. Depending on the grid resolution and the time step size, this model allows the resolution of smaller turbulent structures compared to RANS turbulence models.Flow phenomena in a Francis turbine require long physical time to convect through the machine. Therefore, long computational time with many processors is necessary to conduct such a flow simulation.

Suggested Citation

  • Timo Krappel & Albert Ruprecht & Stefan Riedelbauch, 2013. "Flow Simulation of a Francis Turbine Using the SAS Turbulence Model," Springer Books, in: Wolfgang E. Nagel & Dietmar H. Kröner & Michael M. Resch (ed.), High Performance Computing in Science and Engineering ‘13, edition 127, pages 455-463, Springer.
    • Handle: RePEc:spr:sprchp:978-3-319-02165-2_31
    DOI: 10.1007/978-3-319-02165-2_31
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