Verification and validation of Large Eddy Simulation of attached cavitating flow around a Clark-Y hydrofoil

2019 ◽  
Vol 115 ◽  
pp. 93-107 ◽  
Author(s):  
Yun Long ◽  
Xinping Long ◽  
Bin Ji ◽  
Tao Xing
Keyword(s):  
Large Eddy Simulation ◽  
Cavitating Flow ◽  
Verification And Validation ◽  
Eddy Simulation ◽  
Large Eddy

Large eddy simulation of tip-leakage cavitating flow using a multiscale cavitation model and investigation on model parameters

2021 ◽  
Vol 33 (9) ◽  
pp. 092104
Author(s):  
Linmin Li ◽  
Yakang Huo ◽  
Zhengdong Wang ◽  
Xiaojun Li ◽  
Zuchao Zhu
Keyword(s):  
Large Eddy Simulation ◽  
Cavitating Flow ◽  
Model Parameters ◽  
Cavitation Model ◽  
Tip Leakage ◽  
Eddy Simulation ◽  
Large Eddy

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

Energies ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 7635
Author(s):  
Chengzao Han ◽  
Yun Long ◽  
Mohan Xu ◽  
Bin Ji
Keyword(s):  
Large Eddy Simulation ◽  
Tip Clearance ◽  
Verification And Validation ◽  
Flow Structures ◽  
Tip Clearance Flow ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Clearance Flow ◽  
Vorticity Transport ◽  
Waterjet Pump

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.

Large eddy simulation of natural cavitating flows in Venturi-type sections

2010 ◽  
Vol 225 (2) ◽  
pp. 369-381 ◽  
Author(s):  
N M Nouri ◽  
S M H Mirsaeedi ◽  
M Moghimi
Keyword(s):  
Large Eddy Simulation ◽  
Preliminary Data ◽  
Cavitating Flow ◽  
Navier Stokes ◽  
Computational Time ◽  
Time Averaging ◽  
Cavitating Flows ◽  
Eddy Simulation ◽  
Wide Range ◽  
Large Eddy

Large eddy simulation (LES) is used here to model the cavitating flow at a Venturi-type section. Cavitating flows can occur in a wide range of applications. The flow is represented here by means of LES, which compared to Reynolds-averaged Navier—Stokes (RANS) has the advantage that in it the large, energy-containing structures are resolved directly, whereas most of these structures are modelled in RANS. This gives LES an improved fidelity over RANS, although, due to the time averaging, the required computational time is considerably lower for RANS than for LES. The conclusion of this work shows that the qualitative comparisons with earlier preliminary data and the simulated general cavitation behaviour correlate reasonably well with experimental observations and that the simulations have the ability to predict cavitation cycle in more detail.

scholarly journals Verification and validation of large eddy simulation with Nek5000 for cold leg mixing benchmark

2020 ◽  
Vol 358 ◽  
pp. 110427 ◽  
Author(s):  
Jonathan K. Lai ◽  
Elia Merzari ◽  
Yassin A. Hassan ◽  
Paul Fischer ◽  
Oana Marin
Keyword(s):  
Large Eddy Simulation ◽  
Verification And Validation ◽  
Eddy Simulation ◽  
Large Eddy

Numerical Simulation of Cavity Shedding from a Three-Dimensional Twisted Hydrofoil and Induced Pressure Fluctuation by Large-Eddy Simulation

2012 ◽  
Vol 134 (4) ◽  
Author(s):  
Xianwu Luo ◽  
Bin Ji ◽  
Xiaoxing Peng ◽  
Hongyuan Xu ◽  
Michihiro Nishi
Keyword(s):  
Large Eddy Simulation ◽  
Pressure Fluctuation ◽  
Three Dimensional ◽  
Cavitating Flow ◽  
Numerical Results ◽  
Central Plane ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Cavity Shedding ◽  
Twisted Hydrofoil

Simulation of cavity shedding around a three-dimensional twisted hydrofoil has been conducted by large eddy simulation coupling with a mass transfer cavitation model based on the Rayleigh-Plesset equation. From comparison of the numerical results with experimental observations, e.g., cavity shedding evolution, it is validated that the unsteady cavitating flow around a twisted hydrofoil is reasonably simulated by the proposed method. Numerical results clearly reproduce the cavity shedding process, such as cavity development, breaking-off and collapsing in the downstream. Regarding vapor shedding in the cavitating flow around three-dimensional foils, it is primarily attributed to the effect of the re-entrant flow consisting of a re-entrant jet and a pair of side-entrant jets. Formation of the re-entrant jet in the rear part of an attached cavity is affected by collapse of the last shedding vapor. Numerical results also show that the cavity shedding causes the surface pressure fluctuation of the hydrofoil and the force vibration. Accompanying the cavity evolution, the wave of pressure fluctuation propagates in two directions, namely, from the leading edge of the foil to the trailing edge and from the central plane to the side of the hydrofoil along the span. It is seen that the large pressure fluctuation occurs at the central part of the hydrofoil, where the flow incidence is larger.

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