Verification and validation of large eddy simulations of turbulent cavitating flow around two marine propellers with emphasis on the skew angle effects

Long, Yun; Han, Chengzao; Ji, Bin; Long, Xinping; Wang, Yiwei

doi:10.1016/j.apor.2020.102167

Cited by 26 publications

(10 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The requirement of the grid resolution was comprehensively discussed for V&V study using LES method. In the study of Long et al [45], cavitating flow both around the conventional marine propeller (CP) and a highly skewed marine propeller (HSP) was solved using LES. In the computations, LES V&V was performed for two propellers with a simplified three equations method.…”

Section: Literature Reviewmentioning

confidence: 99%

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Sezen

Uzun

Ozyurt

et al. 2021

Applied Ocean Research

View full text Add to dashboard Cite

Section: Literature Reviewmentioning

confidence: 99%

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Sezen

Uzun

Ozyurt

et al. 2021

Applied Ocean Research

View full text Add to dashboard Cite

“…The V&V approach [33,34] of LES has been applied in the research field of hydrofoil cavitation, which can also be generalized to cavitating flow field around rotating machineries [35]. The paper mainly analyzes the flow field through the error distribution obtained by the LES V&V. The error obtained by numerical calculation can be divided into two parts, namely modeling error and numerical error [25,27].…”

Section: Application Of Vandv Approach In Waterjet Pumpmentioning

confidence: 99%

“…∆t is the time step and ∆N is the local grid size. As for the procedure proposed by Long et al [35], the three-equation method is normally suitable for the rotating machine calculation and the recommended reference values of p N and p M are 1.48 and 1.37, respectively [35]. The present LES V&V method adopts three systematically refined grids with unsteady computations solving for the three variables (S C , c N and c M ):…”

Section: Application Of Vandv Approach In Waterjet Pumpmentioning

confidence: 99%

“…The computational domain used in this paper is consistent with the experiment, as shown in Figure 1 The entire computational domain is composed of the stator domain, the impeller domain and the outer domain, and these parts of the computational domain are connected by a general grid interface (GGI) technology. This method has been proved to be effective to weigh the prediction exactness and calculation consumption [32,35,[37][38][39][40]. All the surfaces of the waterjet pump, including the impeller, stator, pump casing wall and shaft surface are all set as no-slip wall conditions.…”

Section: Waterjet Pump Geometry Numerical Setup and Mesh Informationmentioning

confidence: 99%

“…In order to understand the vorticity distribution in depth, the relative vorticity transport equation is mainly used to discuss the effect of cavitation on the vorticity field. The equation is shown as following [35]:…”

Section: Effect Of Cavitation On the Vortex Distribution In The Pumpmentioning

confidence: 99%

See 2 more Smart Citations

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

Han

Long

et al. 2021

Energies

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Research on quality control of precision machining straight internal gear by abrasive flow based on large eddy simulation

Zou

Yan

Wang

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

Traditional finishing technology is difficult to realize the precision machining of complex geometric parts. Abrasive flow machining technology solves this problem well. Taking the spur internal gear as the research object, the wall shear force, static pressure, dynamic pressure and abrasive velocity vector of the internal channel of the straight internal gear under different inlet velocity, abrasive concentration and abrasive particle size are analyzed by using the large eddy simulation method, and the action law of different parameters on the machining of straight internal gear by solid-liquid two-phase abrasive flow is discussed. At the same time, orthogonal test was carried out. The results show that the solid-liquid two-phase abrasive flow machining technology can effectively remove the burrs, pits and bulges on the tooth surface of spur internal gear, reduce the tooth surface roughness and improve the surface quality. The optimal combination of processing parameters and the primary and secondary order of various factors affecting processing are obtained by range analysis and analysis of variance. The regression equation is constructed by regression analysis to verify the effectiveness and accuracy of the model, which provides theoretical support and data reference for actual processing and production.

show abstract

Verification and validation of large eddy simulations of turbulent cavitating flow around two marine propellers with emphasis on the skew angle effects

Cited by 26 publications

References 31 publications

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

Effect of biofouling roughness on a marine propeller's performance including cavitation and underwater radiated noise (URN)

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

Research on quality control of precision machining straight internal gear by abrasive flow based on large eddy simulation

Contact Info

Product

Resources

About