Applications of Liutex-based force field models for cavitation simulation

Zhao, Minsheng; Zhao, Weiwen; Wan, Decheng; Wang, Yiqian

doi:10.1007/s42241-021-0049-1

Cited by 6 publications

(2 citation statements)

References 20 publications

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“…It can be found that the Liutex method is closer to the real flow field. The vortex parameters Q and |R| are significantly smaller than in other vortex studies [44,45]. This may be related to the flow velocity, pressure, and other parameters of the fishway flow field.…”

Section: Discussionmentioning

confidence: 54%

Application of Vortex Identification Methods in Vertical Slit Fishways

Shen

Yang

Wang

et al. 2023

Water

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The reproduction and survival of fish are often negatively affected by the construction of dams and other hydroelectric projects, which cut off their migratory routes. Building effective fish passage facilities that allow fish to pass through dams smoothly alleviates the negative impact of hydroelectric projects on the ecological environment, thus protecting the diversity of aquatic species and preventing the extinction of indigenous fish. Vertical slit fishways are highly effective, but turbulence inside the fishway pools directly affects fish passage. In this study, the large-eddy simulation framework is used to capture the vortex characteristics in the interior of vertical slit fishway pools, and the volume of fluid method is applied to simulate the free surface. The independence of the grid is assessed by the large-eddy simulation quality index, and the simulation results are compared with experimental acoustic Doppler velocimetry data. This work characterizes the vortex flow field inside the vertical slit fishway using the Q-criterion, Omega method, and Liutex vortex identification method. The results show that the vortex structure inside the fishway pool has obvious three-dimensional characteristics and vortex structure varies within the different fishway pool chambers. The analysis and comparison of the three different vortex identification methods show that the vortex structure captured by the Liutex method is more consistent with the actual motion pattern of the fishway water flow.

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Section: Discussionmentioning

confidence: 54%

Application of Vortex Identification Methods in Vertical Slit Fishways

Shen

Yang

Wang

et al. 2023

Water

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“…Zhan et al [18] compared the performance of the Q-criterion and Liutex methods applied to the in-stream structure and found that the Liutex method is more advantageous. Zhao et al [19] further developed this innovation by implementing the Liutex vector model in multiphase flow numerical simulations of airfoils, revealing more elaborate cavitation vortex cores.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Hydraulic Losses in Vortex Rope Inside the Draft Tube of Francis Pump-Turbine Based on Entropy Production Theory

Wang,

Zhou,

Guo

et al. 2023

Machines

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The existence of vortex ropes inside the draft tube significantly impacts hydraulic efficiency and operational stability, and few studies on the formation mechanism of vortex ropes and hydraulic loss problems have been explored. Hence, in this paper, we build an inherent correlation between the local entropy production rate (LEPR) in the draft tube and the dynamics of vortex motion, by incorporating the vortex identification method Ω~R with entropy production theory, using the OpenFOAM-v2212 software. From the analysis of the entropy production theory, the entropy production rate caused by turbulence dissipation (EPTD) is responsible for the majority of energy loss in the form of entropy production rate, accounting for about 87% of the total entropy production rate (TEPR) in different load operations. Comparatively, the entropy production rate caused by wall shear stress (EPWS) can account for up to 12%, while the entropy production rate due to direct dissipation (EPDD) plays a minor role in TEPR. The rotating vortex rope movement of the unit at part load conditions leads to more intense LEPR. Therefore, to determine the hydraulic loss caused by the vortex rope, the TEPR at the cross-section can be used to assess the hydraulic characteristics of the draft tube.

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