Numerical simulation of shock wave problems with the two-phase two-fluid model

Liu, Fayu; Chen, Huandong; Chen, Jiayue

doi:10.1016/j.pnucene.2020.103259

Cited by 7 publications

(2 citation statements)

References 15 publications

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“…(3) Transient calculations are employed. A variable time propulsion step size ranging from 0.01 s to 0.1 s is adopted based on the Courant Friedrichs Lewy condition to maintain numerical stability [23]. The results are considered converged when the relative residuals of mass conservation, momentum conservation, and component transport equations are less than 10 −4 .…”

Section: Physical Property and Calculation Methodsmentioning

confidence: 99%

Study on the Effect of Structural Parameters of Volume Control Tank on Gas–Liquid Mass Transfer

Chi

et al. 2023

Energies

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The volume control tank (VCT) is an important facility in the primary circuit of nuclear power plants. During the normal operation of nuclear power plants, the mass transfer between the gas and liquid phases occurs in the VCT at all times. It is driven by submerged jets, which may cause potential risks to the operational safety of nuclear power plants. It is necessary to conduct an in-depth study to gain a deeper understanding of the gas–liquid mass transfer behavior in the VCT. In this paper, a new gas–liquid mass transfer model is developed that combines a surface divergence model with a CFD model to accurately simulate the mass transfer process of the gas phase into the liquid phase. The simulation data were verified by the experimental results. The deviation between the simulation results and experimental results is less than 6.55%. Based on this model, a simulation study was carried out for the effect of structural parameters of the VCT on gas–liquid mass transfer. The results show that the double-vortex structure above the jet inlet, the surface jet at the gas–liquid interface, and the vortex at the end of the jet are the three factors dominating the gas–liquid mass transfer in the VCT. The gas–liquid mass transfer can be influenced by the jet diameter since the jet diameter has a remarkable effect on the Kolmogorov scale and the macroscopic flow field structure. Moreover, both the Kolmogorov scale and the macroscopic flow field structure can be affected by the jet height. However, these two effects cancel each other out. Thus, the influence of the jet height on the gas–liquid mass transfer rate is negligible.

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Section: Physical Property and Calculation Methodsmentioning

confidence: 99%

Study on the Effect of Structural Parameters of Volume Control Tank on Gas–Liquid Mass Transfer

Chi

et al. 2023

Energies

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“…In recent decades, the wide attention has attracted the simulation of 1D pressure waves in the in nuclear reactor system [14]. They can be induced by: the rapid closing or opening of system devices, such as pump-valve [15]; steam bubble collapse [16]; loss-of-coolant accident (LOCA) due to leak in piping system [17].…”

Section: Introductionmentioning

confidence: 99%

Semi-analytical implicit direct time integration method for 1-D gas dynamic problem

Orynyak,

Kostyushko,

Mazuryk

2023

Mech. Adv. Technol.

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Sharp wave treatment for 1-D gas dynamic problem is still a chellenge for modern numerical methods. They often require too many space and time steps, produce spurious oscillation of solution, exhibit a strong numerical dissipation or divergence of results. This paper is further extension of authors’ idea of employment the analytical solution for space coordinate, where time step is a parameter which used in the space solution. Its peculiarity consists in development of additional procedure of linearization of dependence between the pressure and density. It is performed in premise that actual pressure for each space element is close to the basic pressure, attained at previous moment of time. The efficiency of method is tested on the very popular task of Sod, where two different ideal gases in a tube are separated by diaphragm, which is suddenly broken. The problem considered in Lagrangian coordinates formulation. The results obtained show the very good efficiency of method, which requires the essentially lesser time and space steps, leads to no spurious oscillation and give consistent and predictable results with respect to meshing. The accuracy of method is mostly controlled by time step, which should be larger than clearly stated theoretical lower limit. Other advantage of method is that it can calculate the process to any desired moment of time, and space meshing can be variable in time and space and can be easily adapted during the process of calculation.

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Code development of Single-phase 2-D pressure wave propagation

Dai

et al. 2022

Annals of Nuclear Energy

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Numerical simulation of shock wave problems with the two-phase two-fluid model

Cited by 7 publications

References 15 publications

Study on the Effect of Structural Parameters of Volume Control Tank on Gas–Liquid Mass Transfer

Study on the Effect of Structural Parameters of Volume Control Tank on Gas–Liquid Mass Transfer

Semi-analytical implicit direct time integration method for 1-D gas dynamic problem

Code development of Single-phase 2-D pressure wave propagation

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