Abstract
To improve the flexiblity in the operation of pumped storage power plants, it is necessary to understand the flow phenomena during a change of operating mode. In this work, a fast transition from pump mode to generating mode in a reversible pump turbine is investigated with the open source code OpenFOAM®;. The analysis is run on two different meshes for a constant guide vane opening on the ForHLR 1 cluster. A speedup test is employed to test scalability and determine a suitable number of cores. Results are presented for different monitor points in the machine. Furthermore, the flow field in the runner is analysed for different points of time. The coarse mesh is generally able to give the same trends as the fine mesh, but with an offset in absolute value during parts of the transient.
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