3-D Lagrangian-based investigations of the time-dependent cloud cavitating flows around a Clark-Y hydrofoil with special emphasis on shedding process analysis

Cheng, Huaiyu; Long, Xinping; Ji, Bin; Liu, Qi; Bai, Xiaorui

doi:10.1007/s42241-018-0013-x

Cited by 22 publications

(5 citation statements)

References 32 publications

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“…Zwart et al (2004) proposed a new multiphase flow TEM for predicting cavitation based on the Rayleigh-Plesset equation. The simulation accuracy of this cavitation model has been verified in many literatures (Ji et al, 2011(Ji et al, , 2012(Ji et al, , 2013Luo et al, 2012;Ducoin et al, 2012;Huang et al, 2014;Bannari et al, 2017;Taher et al, 2017;Qiu et al, 2018;Cheng et al, 2018). It has been implemented in the commercially available CFD package ANSYS CFX.…”

Section: Introductionmentioning

confidence: 76%

A cavitation model considering thermodynamic and viscosity effects

Pang

Yang

et al. 2018

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Purpose This study aims to develop and validate a new cavitation model that considers thermodynamic effects for high-temperature water flows. Design/methodology/approach The Rayleigh–Plesset equation and “B-factor” method proposed by Franc are used to construct a new cavitation model called “thermodynamic Zwarte–Gerbere–Belamri” (TZGB) by introducing the thermodynamic effects into the original ZGB model. Furthermore, the viscous term of the Rayleigh–Plesset equation is considered in the TZGB model, and the model coefficients are formulated as a function of temperature. Cavitating flows around the NACA0015 hydrofoil under different water temperatures (25°C, 50°C and 70°C) at the angle of attack of 5° are calculated. Findings Results of the investigated temperatures show good agreement with the available experimental data. Given that the thermodynamic and viscosity effects are included in the TZGB model and the model coefficients are treated as a function of temperature, the TZGB model shows better performance in predicting the pressure coefficient distribution and length of cavity than the original ZGB cavitation model and other models do. The TZGB model aims to determine the thermodynamic and viscosity effects and perform better than the other models in predicting the mass transfer rate, particularly in high-temperature water. Originality/value The TZGB model shows potential in predicting the cavitating flows at high temperature and the computational cost of this model is similar to that of the original ZGB model.

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Section: Introductionmentioning

confidence: 76%

A cavitation model considering thermodynamic and viscosity effects

Pang

Yang

et al. 2018

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“…The transport equation with the homogeneous hypothesis is employed to simulate multiphase flow, and both two phases, liquid and vapor phases, are considered as incompressible phases [30][31][32]. The Zwart cavitation model [31] is one of the widely used models in many solvers for cavitating flow, whose accuracy has obtained wide approval [5,32]. The cavitation process is described by the following vapor transfer equation:…”

Section: Governing Equationsmentioning

confidence: 99%

“…The TLV is apt to cause vortex cavitation around the rotor-shroud clearance [4,5]. A single hydrofoil with tip clearance can be considered as a special example to study the TLV cavitation.…”

Section: Introductionmentioning

confidence: 99%

Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump

Han

Long

et al. 2021

Energies

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In this paper, large eddy simulation (LES) was adopted to simulate the cavitating flow in a waterjet pump with emphasis on the tip clearance flow. The numerical results agree well with the experimental observations, which indicates that the LES method can make good predictions of the unsteady cavitating flows around a rotor blade. The LES verification and validation (LES V&V) analysis was used to reveal the influence of cavitation on the flow structures. It can be found that the LES errors in cavitating region are larger than those in the non-cavitating area, which is mainly caused by more complicated cavitating and tip clearance flow structures. Further analysis of the interaction between the cavitating and vortex flow by the relative vorticity transport equation shows that the stretching, dilatation and baroclinic torque terms have major effects on the generation and transport of vortex structure. Meanwhile the Coriolis force term and viscosity term also exacerbate the vorticity transport in the cavitating region. In addition, the flow loss characteristics of this pump are also revealed by the entropy production theory. It is indicated that the tip clearance flow and trailing edge wake flow cause the viscous dissipation and turbulent dissipation, and the cavitation can further enhance the instability of the flow field in the tip clearance.

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“…They reported that the LCSs provide a powerful visualization tool that can be used to reveal the vortex street in the cylinder's wake. Recent studies successfully implemented the Lagrangian method to investigate the cavitating turbulent flows around hydrofoil [18,19,20,21]. Cheng et al [18] and Long et al [19] identified two and three-dimensional FTLE fields, respectively, to analyze turbulent flows around the Delft twisted hydrofoil.…”

mentioning

confidence: 99%

“…The three-dimensional LCSs [19] provides a promising visualization alternative to study the vortex dynamics in turbulent flows. Tseng & Liu [20] and Cheng et al [21] implemented the Lagrangian approach to study the dynamics of the cavitating turbulent flows over the ClarkY hydrofoil. 76 They reported that LCSs provide a better understanding of the cavitation evolution, and the spatial and 77 temporal characteristics of the wake flow.…”

mentioning

confidence: 99%

Vortex identification in turbulent flows past plates using the Lagrangian method

et al. 2019

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Vortex identifications in turbulent flows past arrays of tandem plates are performed by employing the velocity field obtained by high-fidelity large eddy simulations. Lagrangian coherent structures (LCSs) are extracted to examine the evolution and the nonlinear interaction of vortices and to characterize the spatial and temporal characteristics of the flow. LCSs’ identification method is based on the finite-time Lyapunov exponent (FTLE), which is evaluated using the instantaneous velocity data. The simulations are performed in three-dimensional geometries to understand the physics of fluid motion and the vortex dynamics in the vicinity of plates and surfaces at Reynolds number of 50 000. The instantaneous vorticity fields, Eulerian Q-criterion, and LCSs are presented to interpret and understand complex turbulent flow structures. The three-dimensional FTLE fields provide valuable information about the vortex generation, spatial location, evolution, shedding, decaying, and dissipation of vortices. It is demonstrated here that FTLE can be used together with Eulerian vortex identifiers to characterize the turbulent flow field effectively.

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3-D Lagrangian-based investigations of the time-dependent cloud cavitating flows around a Clark-Y hydrofoil with special emphasis on shedding process analysis

Cited by 22 publications

References 32 publications

A cavitation model considering thermodynamic and viscosity effects

A cavitation model considering thermodynamic and viscosity effects

Verification and Validation of Large Eddy Simulation for Tip Clearance Vortex Cavitating Flow in a Waterjet Pump

Vortex identification in turbulent flows past plates using the Lagrangian method

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