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Numerical Analysis of a Propeller Turbine Operated in Part Load Conditions

In: High Performance Computing in Science and Engineering ' 17

Author

Listed:
  • Bernd Junginger

    (University of Stuttgart, Institute of Fluid Mechanics and Hydraulic Machinery)

  • Stefan Riedelbauch

    (University of Stuttgart, Institute of Fluid Mechanics and Hydraulic Machinery)

Abstract

A part load operating point of a hydraulic propeller turbine is numerically analyzed. Transient flow simulations without geometry simplifications are performed on meshes up to 100 million nodes using RANS and hybrid RANS-LES turbulence models. The weaknesses of steady state and transient RANS computations are evaluated against transient approaches with hybrid RANS-LES turbulence models. Due to the dominating phenomena of the vortex rope the focus of the results presented is on the draft tube flow field. Therefore, velocity profiles at 5 evaluation lines located in the draft tube are compared as well as the capabilities of the turbulence models to resolve the turbulent flow structures and developing vorticies for different mesh densities. Additionally, hydraulic losses in the machine components are compared.

Suggested Citation

  • Bernd Junginger & Stefan Riedelbauch, 2018. "Numerical Analysis of a Propeller Turbine Operated in Part Load Conditions," Springer Books, in: Wolfgang E. Nagel & Dietmar H. Kröner & Michael M. Resch (ed.), High Performance Computing in Science and Engineering ' 17, pages 355-368, Springer.
    • Handle: RePEc:spr:sprchp:978-3-319-68394-2_21
    DOI: 10.1007/978-3-319-68394-2_21
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