LES analyses of the air-core vortex in intake flow field of pumping station

D. Zi, Lian Shen, Anqing Xuan, F. J. Wang

Research output: Contribution to journalConference article

Abstract

Air-core vortex is a universal and attention-getting phenomenon in intake flow field of pumping station. Due to the difficulties and complexities of two-phase flow of the air-core vortex, the Coupled Level-Set and Volume-of-Fluid (CLSVOF) method is adopted in the simulation, and a horizontal intake pipe in pump sump was calculated. Results of the simulation were consistent with that of experiment. The air-core vortex is successfully reproduced in the simulation, and four stages during its formation is observed. At the early stage of the simulation, vortices generated in the vicinity of the free surface are gathered in the stagnation region above the pipe intake. The intensity of the gathering vortices increases due to the stretching effect of ωy (vertical vorticity component), and move toward to the pipe intake due to the downward flow motion of the stagnation region. Furthermore, air-core vortex meandering is observed from the time series of instantaneous vortex motion, and quasi-periodicity is founded in its meandering, which is caused by the quasi-periodic characteristic of the velocity filed. The dominant frequency (fD/vD ) of coordinate x of the air-core vortex center is around 0.0096, and coordinate z is around 0.0191.

Original languageEnglish (US)
Article number032037
JournalIOP Conference Series: Earth and Environmental Science
Volume240
Issue number3
DOIs
StatePublished - Mar 28 2019
Event29th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2018 - Kyoto, Japan
Duration: Sep 16 2018Sep 21 2018

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flow field
vortex
pumping
air
pipe
simulation
station
two phase flow
vorticity
periodicity
pump
time series
fluid
experiment

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LES analyses of the air-core vortex in intake flow field of pumping station. / Zi, D.; Shen, Lian; Xuan, Anqing; Wang, F. J.

In: IOP Conference Series: Earth and Environmental Science, Vol. 240, No. 3, 032037, 28.03.2019.

Research output: Contribution to journalConference article

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AU - Xuan, Anqing

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N2 - Air-core vortex is a universal and attention-getting phenomenon in intake flow field of pumping station. Due to the difficulties and complexities of two-phase flow of the air-core vortex, the Coupled Level-Set and Volume-of-Fluid (CLSVOF) method is adopted in the simulation, and a horizontal intake pipe in pump sump was calculated. Results of the simulation were consistent with that of experiment. The air-core vortex is successfully reproduced in the simulation, and four stages during its formation is observed. At the early stage of the simulation, vortices generated in the vicinity of the free surface are gathered in the stagnation region above the pipe intake. The intensity of the gathering vortices increases due to the stretching effect of ωy (vertical vorticity component), and move toward to the pipe intake due to the downward flow motion of the stagnation region. Furthermore, air-core vortex meandering is observed from the time series of instantaneous vortex motion, and quasi-periodicity is founded in its meandering, which is caused by the quasi-periodic characteristic of the velocity filed. The dominant frequency (fD/vD ) of coordinate x of the air-core vortex center is around 0.0096, and coordinate z is around 0.0191.

AB - Air-core vortex is a universal and attention-getting phenomenon in intake flow field of pumping station. Due to the difficulties and complexities of two-phase flow of the air-core vortex, the Coupled Level-Set and Volume-of-Fluid (CLSVOF) method is adopted in the simulation, and a horizontal intake pipe in pump sump was calculated. Results of the simulation were consistent with that of experiment. The air-core vortex is successfully reproduced in the simulation, and four stages during its formation is observed. At the early stage of the simulation, vortices generated in the vicinity of the free surface are gathered in the stagnation region above the pipe intake. The intensity of the gathering vortices increases due to the stretching effect of ωy (vertical vorticity component), and move toward to the pipe intake due to the downward flow motion of the stagnation region. Furthermore, air-core vortex meandering is observed from the time series of instantaneous vortex motion, and quasi-periodicity is founded in its meandering, which is caused by the quasi-periodic characteristic of the velocity filed. The dominant frequency (fD/vD ) of coordinate x of the air-core vortex center is around 0.0096, and coordinate z is around 0.0191.

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