Abstract
Transient flow simulations of a Francis turbine in part load conditions using hybrid RANS-LES turbulence models are presented. In the draft tube a rotating low pressure zone—the vortex rope phenomenon—arises, which leads to very complex flow phenomena. A detailed resolution of the flow in space and time is leading to large computational effort.
For the flow simulations the commercial CFD code Ansys CFX version 16.0 is used, as the parallel performance especially for this application has improved. Two hybrid RANS-LES turbulence models, the Scale Adaptive Simulation (SAS) and Detached Eddy Simulation (DES) are applied. To have a very good resolution of turbulence, meshes in the range of 50 to 300 million mesh nodes are investigated running on up to more than 2000 cores in parallel.
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Acknowledgements
The research leading to the results presented in this paper is part of a common research project of the Institute of Fluid Mechanics and Hydraulic Machinery, Voith Hydro Holding GmbH & Co. KG and Ansys Germany GmbH.
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Krappel, T., Ruprecht, A., Riedelbauch, S. (2016). Turbulence Resolving Flow Simulations of a Francis Turbine with a Commercial CFD Code. In: Nagel, W., Kröner, D., Resch, M. (eds) High Performance Computing in Science and Engineering ’15. Springer, Cham. https://doi.org/10.1007/978-3-319-24633-8_27
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DOI: https://doi.org/10.1007/978-3-319-24633-8_27
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