000205205 001__ 205205
000205205 005__ 20190812205825.0
000205205 02470 $$2ISI
000205205 0247_ $$a10.1088/1755-1315/22/2/022018$$2doi
000205205 02470 $$a000347441900052
000205205 037__ $$aCONF
000205205 245__ $$aHigh-resolution LES of the rotating stall in a reduced scale model pump-turbine
000205205 260__ $$c2014$$bIop Publishing Ltd$$aBristol
000205205 269__ $$a2014
000205205 300__ $$a8
000205205 336__ $$aConference Papers
000205205 490__ $$aIOP Conference Series-Earth and Environmental Science$$v22
000205205 520__ $$aExtending the operating range of modern pump-turbines becomes increasingly important in the course of the integration of renewable energy sources in the existing power grid. However, at partial load condition in pumping mode, the occurrence of rotating stall is critical to the operational safety of the machine and on the grid stability. The understanding of the mechanisms behind this flow phenomenon yet remains vague and incomplete. Past numerical simulations using a RANS approach often led to inconclusive results concerning the physical background. For the first time, the rotating stall is investigated by performing a large scale LES calculation on the HYDRODYNA pump-turbine scale model featuring approximately 100 million elements. The computations were performed on the PRIMEHPC FX10 of the University of Tokyo using the overset Finite Element open source code FrontFlow/blue with the dynamic Smagorinsky turbulence model and the no-slip wall condition. The internal flow computed is the one when operating the pump-turbine at 76% of the best efficiency point in pumping mode, as previous experimental research showed the presence of four rotating cells. The rotating stall phenomenon is accurately reproduced for a reduced Reynolds number using the LES approach with acceptable computing resources. The results show an excellent agreement with available experimental data from the reduced scale model testing at the EPFL Laboratory for Hydraulic Machines. The number of stall cells as well as the propagation speed corroborates the experiment.
000205205 542__ $$fCC BY
000205205 700__ $$aPacot, Oliver
000205205 700__ $$aKato, Chisachi
000205205 700__ $$g104417$$aAvellan, Francois$$0241012
000205205 7112_ $$dSeptember 22-26, 2014$$cMontréal, Québec, Canada$$a27th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2014)
000205205 7112_ $$dSeptember 22-26, 2014$$cMontréal, Canada$$a27th IAHR Symposium on Hydraulic Machinery and Systems
000205205 720_1 $$aDesy, N$$eed.
000205205 720_1 $$aDeschenes, C$$eed.
000205205 720_1 $$aGuibault, F$$eed.
000205205 720_1 $$aPage, M$$eed.
000205205 720_1 $$aTurgeon, M$$eed.
000205205 720_1 $$aGiroux, Am$$eed.
000205205 773__ $$j22$$tProceedings of the 27th IAHR Symposium on Hydraulic Machinery and Systems (IAHR 2014)$$q1-8
000205205 8564_ $$uhttps://infoscience.epfl.ch/record/205205/files/High-resolution%20LES%20of%20the%20rotating%20stall%20in%20a%20reduced%20scale%20model%20pump-turbine.pdf$$s867664
000205205 8564_ $$xpdfa$$uhttps://infoscience.epfl.ch/record/205205/files/High-resolution%20LES%20of%20the%20rotating%20stall%20in%20a%20reduced%20scale%20model%20pump-turbine.pdf?subformat=pdfa$$s1932763
000205205 8560_ $$femilie.reynaud@epfl.ch
000205205 909C0 $$xU10309$$pLMH$$0252135
000205205 909CO $$ooai:infoscience.tind.io:205205$$qGLOBAL_SET$$pconf$$pSTI
000205205 917Z8 $$x104417
000205205 917Z8 $$x104417
000205205 937__ $$aEPFL-CONF-205205
000205205 973__ $$rREVIEWED$$aEPFL
000205205 980__ $$aCONF