Numerical Simulation of Violent Impinging Jet Flows with Improved SPH Method

Shao, Jiaru; Li, S. M.; Liu, Moubin

doi:10.1142/s0219876216410012

Cited by 16 publications

(8 citation statements)

References 18 publications

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“…Kernel gradient correction was developed to improve the simulation accuracy, and Bonet and Lok (1999) proved that by theoretical derivation. Shao et al (2012) and Zhang and Liu (2017) have applied KGC in SPH simulation of liquid sloshing dynamics, high velocity impact, and violent impinging flow problems (Shao et al, 2016), which all focus on singlephase flow problems. Zhu et al (2018) presented a SPH model for simulating multiphase flows with the use of KGC.…”

Section: Kernel Gradient Correctionmentioning

confidence: 99%

An improved multiphase SPH algorithm with kernel gradient correction for modelling fuel–coolant interaction

Wang

Zhang²,

Wu³

2023

Front. Energy Res.

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Fuel–coolant interaction (FCI) has a pivotal role in the development of core disruptive accident in a sodium-cooled fast reactor. The drastic deformation of multiphase interface in the FCI is hard to deal with in the traditional grid method. In this paper, an improved multiphase smoothed particle hydrodynamics (SPH) algorithm corrected with the kernel gradient correction (KGC) technique is presented for multiphase flow with a large density ratio and complex interfacial behaviors. The density discontinuity across the multiphase interface is described with the use of special volume, which only depends on the position information of adjacent particles. This multiphase SPH algorithm, which is troubled by an unstable and mixed-interface problem under a large density ratio, is significantly improved with the KGC technique. The accuracy and robustness of the improved method are demonstrated in the numerical simulations of the deformation of a square droplet, Rayleigh–Taylor instability, and bubble rising in water. The verified corrected multiphase SPH is applied to simulate the hydrodynamic behaviors of the general FCI and the interaction between fuels coated with stainless steel film and coolant. Boundary layer stripping, Rayleigh–Taylor instability, and Kelvin–Helmholtz instability are observed as important mechanisms of hydraulic fracturing. The fragments’ distribution and the influence of stainless steel film are analyzed. The existence of a stainless steel film has been shown to inhibit breakage.

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Section: Kernel Gradient Correctionmentioning

confidence: 99%

An improved multiphase SPH algorithm with kernel gradient correction for modelling fuel–coolant interaction

Wang

Zhang²,

Wu³

2023

Front. Energy Res.

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“…Hence, an SPH approximation scheme, which is of higher order accuracy and is insensitive to disordered particle distribution, is necessary for modeling HVI. In this paper, the KGC technique [Shao et al (2012a[Shao et al ( , 2016 Liu et al (2017)], which mathematically improves the accuracy of the gradient of the kernel functions (or kernel gradient), is extended from 2D to 3D, and from modeling incompressible flows to HVI problems. In the KGC technique, a modified or corrected kernel gradient is obtained by multiplying the original kernel gradient with a local reversible matrix L(r i ).…”

Section: Kgc Techniquementioning

confidence: 99%

A New Formula for Predicting the Crater Size of a Target Plate Produced by Hypervelocity Impact

Zhang

Feng

et al. 2019

Int. J. Comput. Methods

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Hypervelocity impact (HVI) of materials is usually associated with large deformations of structures, big craters, phase transition of materials and scattered debris cloud. It is difficult to predict the size of damage caused by HVI while comprehensively considering all the influencing factors for both experimental and numerical approaches. In this paper, the HVI process is modeled by using the smoothed particle hydrodynamics (SPH) method with Kernel Gradient Correction (KGC) technique. The SPH method with KGC (SPH-KGC) has been demonstrated to have better accuracy and reliability for modeling the HVI problems in our recent work. In this paper, the SPH-KGC method is used to investigate the HVI of a sphere on a target plate. The sizes of the craters produced by HVI at different initial impact velocities are obtained, and the variation of the crater size over the impact velocity is studied. According to the present simulation results, a critical velocity is identified and the increase of the crater size versus the initial impact velocity can be divided into two stages, a varying stage and a steady stage. A new empirical formula is presented for predicting the crater size of the target plate produced by HVI. This formula comprehensively considers the influence of many model parameters, such as the densities of the materials of both the projectile and the target, the sound speed of the target material, the diameter of the projectile and the thickness of the target plate. The results obtained by the presented prediction formula agree well with the experimental observations as well as the present SPH simulation results.

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“…Through numerical simulation, the reason for a scale effect of the impact pressure was elucidated. Shao et al [19] improved the traditional smoothed particle hydrodynamics (SPH) method and verified its effectiveness by simulating the water jet impingement problem. The results showed that the improved SPH method can accurately simulate the shape and pressure distribution of an impinging jet.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Numerical Calculation of Oblique Submerged Jet

et al. 2020

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A water jet is a kind of high-speed dynamic fluid with high energy, which is widely used in the engineering field. In order to analyze the characteristics of the flow field and the change of law of the bottom impact pressure of the oblique submerged impinging jet at different times, its unsteady characteristics at different Reynolds numbers were studied by using the Wray–Agarwal (W-A) turbulence model. It can be seen from the results that in the process of jet movement, the pressure at the peak of velocity on the axis was the smallest, and the velocity, flow angle, and pressure distribution remain unchanged after a certain time. In the free jet region, the velocity, flow angle, and pressure remained unchanged. In the impingement region, the velocity and flow angle decreased rapidly, while the pressure increased rapidly. The maximum pressure coefficient of the impingement plate changed with time and was affected by the Reynolds number, but the distribution trend remained the same. In this paper, the characteristics of the flow field and the law of the impact pressure changing with time are described.

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Numerical Simulation of Violent Impinging Jet Flows with Improved SPH Method

Cited by 16 publications

References 18 publications

An improved multiphase SPH algorithm with kernel gradient correction for modelling fuel–coolant interaction

An improved multiphase SPH algorithm with kernel gradient correction for modelling fuel–coolant interaction

A New Formula for Predicting the Crater Size of a Target Plate Produced by Hypervelocity Impact

Unsteady Numerical Calculation of Oblique Submerged Jet

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