Journal ArticleDOI
Cavitation shedding dynamics around a hydrofoil simulated using a filter-based density corrected model
Reads0
Chats0
TLDR
In this article, the effects of turbulent eddy viscosity were reduced in cavitation regions near the hydrofoil and in the wake using the filter-based density corrected model (FBDCM).Abstract:
The unsteady turbulent cloud cavitation around a NACA66 hydrofoil was simulated using the filter-based density corrected model (FBDCM). The cloud cavitation was treated as a homogeneous liquid-vapor mixture and the effects of turbulent eddy viscosity were reduced in cavitation regions near the hydrofoil and in the wake. The numerical results (in terms of the vapor shedding structure and transient pressure pulsation due to cavitation evolution) agree well with the available experimental data, showing the validity of the FBDCM method. Furthermore, the interaction of vortex and cavitation was analyzed based on the vorticity transport equation, revealing that the cavitation evolution has a strong connection with vortex dynamics. A detailed analysis shows that the cavitation could promote the vortex production and flow unsteadiness by the dilatation and baroclinic torque terms in the vorticity transport equation.read more
Citations
More filters
Journal ArticleDOI
A review of cavitation in hydraulic machinery
TL;DR: In this paper, the authors summarized the recent progress for the cavitation study in the hydraulic machinery including turbo-pumps, hydro turbines, etc., and identified the 1-D analysis method, which is identified to be very useful for engineering applications regarding the cavitating flows in inducers, turbine draft tubes, etc.
Journal ArticleDOI
Cavitation–Vortex–Turbulence Interaction and One-Dimensional Model Prediction of Pressure for Hydrofoil ALE15 by Large Eddy Simulation
Ming Liu,Lei Tan,Shuliang Cao +2 more
TL;DR: In this paper, the cavitating flow around the asymmetric leading edge (ALE) 15 hydrofoil is investigated through large eddy simulation with the modified Schnerr-Sauer cavitation model, which considers the effect of noncondensable gas.
Journal ArticleDOI
Numerical investigation of attached cavitation shedding dynamics around the Clark-Y hydrofoil with the FBDCM and an integral method
TL;DR: Huang et al. as mentioned in this paper used the integral method and numerical simulations with the filter-based density correction model turbulence model to investigate cavitating turbulent flow around a three-dimensional Clark-Y hydrofoil.
Journal ArticleDOI
Calculation of cavitation evolution and associated turbulent kinetic energy transport around a NACA66 hydrofoil
TL;DR: In this article, the Schnerr-Sauer cavitation model was adopted to capture the cavitation phase change process and the influence of cavitation on the turbulence intensity was illustrated using the turbulent kinetic energy transport equation, which showed that the pressure diffusion and turbulent transport terms dominate as cavitation occurs.
Journal ArticleDOI
Numerical simulation of cryogenic cavitating flow by an extended transport-based cavitation model with thermal effects
TL;DR: In this article, the authors analyzed the thermal cavitating flows in liquid nitrogen around a 2D hydrofoil and proposed a modified Zwart-Gerber-Belamri model for better prediction of the cryogenic cavitation.
References
More filters
Book
Fundamentals of Cavitation
TL;DR: Kato et al. as mentioned in this paper studied the dynamics of cavitation in real liquid flows and proposed a steady potential flow theory to model the cavity flow dynamics of a liquid/vapor mixture with phase change.
Journal ArticleDOI
Evaluation of the turbulence model influence on the numerical simulations of unsteady cavitation
TL;DR: In this article, a simulation of turbulent cavitation in a Venturi-type section was performed by two-dimensional computations of viscous, compressible, and turbulent cavitating flows.
Journal ArticleDOI
Large Eddy Simulation and theoretical investigations of the transient cavitating vortical flow structure around a NACA66 hydrofoil
TL;DR: In this paper, the cavitating flow around a NACA66 hydrofoil is studied numerically with particular emphasis on understanding the cavitation structures and the shedding dynamics, including the cavity growth, break-off and collapse downstream.
Journal ArticleDOI
Cavitation in vortical flows
TL;DR: In this paper, it was shown that vortex core instabilities in microvortices are important factors in the erosion mechanisms associated with sheet/cloud cavitation. But, only limited attention paid to developed vortex cavitation was paid to the inception process.
Journal ArticleDOI
Numerical simulation of three dimensional cavitation shedding dynamics with special emphasis on cavitation–vortex interaction
TL;DR: In this article, the structure of the cavitating flow around a twisted hydrofoil was investigated numerically using the mass transfer cavitation model and the modified RNG k-e model with a local density correction for turbulent eddy viscosity.