Cavitation of Multiscale Vortices in Circular Cylinder Wake at Re = 9500

Gu, Feng; Huang, Yadong; Stankovic, John A.

doi:10.3390/jmse9121366

Cited by 11 publications

(4 citation statements)

References 33 publications

(31 reference statements)

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“…The convergence standard of all residuals is 10 -6 . The validation of the present numerical simulation can be found in our previous work (Gu et al, 2021). It should be mentioned that in the following analyses, all parameters shown in the figures are nondimensionalized via the cylinder diameter and the inlet velocity.…”

Section: Numerical Setupmentioning

confidence: 69%

Numerical investigation of energy loss distribution in the cavitating wake flow around a cylinder using entropy production method

Zhang,

Yang,

et al. 2023

Front. Energy Res.

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The wake flow of a circular cylinder is numerically investigated by Large Eddy Simulation (LES) combined with the Schnerr–Sauer cavitation model. By comparing entropy production in the presence or absence of cavitation, the energy loss distribution in the wake flow field of a cylinder is explored, shedding light on the interactions between multiscale vortex systems and cavitation. The comparative results reveal that, under non-cavitating conditions, the energy loss region in the near-wake area is more concentrated and relatively larger. Energy dissipation in the wake flow field occurs in regions characterized by very high velocity gradients, primarily near the upper and lower surfaces of the cylinder near the leading edge. The influence of cavitation bubbles on entropy production is predominantly observed in the trailing-edge region (W1) and the near-wake region (W2). The distribution trends of wall entropy production on the cylinder’s surface are generally consistent in both conditions, with wall entropy production primarily concentrated in regions exhibiting high velocity gradients.

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Section: Numerical Setupmentioning

confidence: 69%

Numerical investigation of energy loss distribution in the cavitating wake flow around a cylinder using entropy production method

Zhang,

Yang,

et al. 2023

Front. Energy Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…The convergence criterion of all residuals is 10 -6 . The validation of the present numerical simulation can be found in our previous work (Gu et al, 2021). It should be mentioned that in the following analyses, all parameters shown in the figures are nondimensionalized via the cylinder diameter and the inlet velocity.…”

Section: Numerical Setupmentioning

confidence: 69%

Numerical investigation on the cavitating wake flow around a cylinder based on proper orthogonal decomposition

Zhang,

Yang,

et al. 2023

Front. Energy Res.

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The non-cavitating and cavitating wake flow of a circular cylinder, which contains multiscale vortices, is numerically investigated by Large Eddy Simulation combined with the Schnerr–Sauer cavitation model in this paper. In order to investigate the spatiotemporal evolution of cavitation vortex structures, the Proper Orthogonal Decomposition (POD) method is employed to perform spatiotemporal decomposition on the cylinder wake flow field obtained by numerical simulation. The results reveal that the low-order Proper Orthogonal Decomposition modes correspond to large-scale flow structures with relatively high energy and predominantly single frequencies in both non-cavitating and cavitating conditions. The presence of cavitation bubbles in the flow field leads to a more pronounced deformation of the vortex structures in the low-order modes compared to the non-cavitating case. The dissipation of pressure energy in the cylinder non-cavitating wake occurs faster than the kinetic energy. While in the cavitating wake, the kinetic energy dissipates more rapidly than the pressure energy.

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“…In addition, He indicated that the cavitation inception formed on the cylinder can depend on the effects of the Reynolds number. Gu et al [10] numerically studied the cavitation dynamics and multiscale vortices formed behind a circular cylinder using the large eddy simulation (LES) method at a middle Reynolds number of about 9500. Brandao et al [11] investigated the cavitation behavior behind a circular cylinder at different cavitating regimes.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Cavitation Control around a Circular Cylinder Using Porous Surface by Volume Penalized Method

Sadri,

Kadivar,

el Moctar

2024

JMSE

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In this work, we conducted a numerical study on the cavitation flow around a circular cylinder with Re=200 and σ=1, through the implementation of a porous coating. The primary objective addressed the effectiveness of utilizing a porous surface to control cavitation. We analyzed the cavitation dynamics around the cylinder and the hydrodynamic performance at different permeability levels of the porous surfaces (K=10−12−10−10). The flow was governed by the density-based homogeneous mixture model, and the volume penalization method was used to deal with the porous layer. A high-order compact numerical method was adopted for the simulation of the cavitating flow through solving the preconditioned multiphase equations. The hydrodynamic findings demonstrated that the fluctuations in the lift coefficient decreased when the porous layer was applied. However, it is not possible to precisely express an opinion about drag because the drag coefficient may vary, either increasing or decreasing, depending on the permeability within a constant thickness of the porous layer. The results revealed that the application of a porous layer led to the effective suppression of cavitation vortex shedding. In addition, a reduction of the shedding frequency was obtained, which was accompanied by thinner and elongated vortices in the wake region of the cylinder. With the proper porous layer, the inception of the cavitation on the cylinder was suppressed, and the amplitude of pressure pulsations due to the cavitation shedding mechanism was mitigated.

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Cavitation of Multiscale Vortices in Circular Cylinder Wake at Re = 9500

Cited by 11 publications

References 33 publications

Numerical investigation of energy loss distribution in the cavitating wake flow around a cylinder using entropy production method

Numerical investigation of energy loss distribution in the cavitating wake flow around a cylinder using entropy production method

Numerical investigation on the cavitating wake flow around a cylinder based on proper orthogonal decomposition

Numerical Simulation of Cavitation Control around a Circular Cylinder Using Porous Surface by Volume Penalized Method

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