Numerical study of 3-D air core phenomenon during liquid draining

Son, Jong Hyeon; Sohn, Chang Hyun; Park, Il Seouk

doi:10.1007/s12206-015-0921-4

Cited by 25 publications

(22 citation statements)

References 26 publications

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“…The discrete pressure interpolation was adopted to avoid tremendous change of internal pressure and high swirl by the Pressure Staggering Option (PRESTO). The second order upwind scheme was applied to the functions of momentum, turbulent kinetic energy, and turbulent dissipation rate . The stability of VOF model is greatly affected by the size of the cell grid and time step, so the appropriate time step can be selected according to the linear numerical stability conditions given by Hirt and Nichols …”

Section: Model Descriptionsmentioning

confidence: 99%

Physical and Mathematical Simulation of Surface‐Free Vortex Formation and Vortex Prevention Design during the End of Casting in Tundish

Ruan

Yao

Shen

et al. 2020

steel research int.

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Herein, the formation of the vortex and slag entrainment in tundish is studied by using mathematical and physical simulation. This article aims at contributing to the understanding of the free surface vortex formation in continuous casting tundish at the end of casting. A 3D multiphase mathematical model using the renormalization group (RNG) k–ε turbulence model is developed to predict the vortex formation and slag layer behavior on the scale of the 1:4 water model of a two‐strand slab tundish. The Eulerian volume of fluid model is adopted to track the steel–slag–air free surface and vortex, and the effect of Coriolis force is considered in this simulation. An improved vortex prevention design is also proposed by changing the position of the diversion hole on the dam of the tundish, which is compared with the original scheme using numerical and physical simulation. The predicted results of the vortex structure and the critical height of the vortex formation agree well with the water modeling results. It is demonstrated that the critical height of the vortex formation is reduced significantly by regulating the position of the diversion hole on the dam near the outlet of the tundish.

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Section: Model Descriptionsmentioning

confidence: 99%

Physical and Mathematical Simulation of Surface‐Free Vortex Formation and Vortex Prevention Design during the End of Casting in Tundish

Ruan

Yao

Shen

et al. 2020

steel research int.

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“…Figure 2 shows the generation of the air core with a contact angle less than 90 inside a cylindrical tank from 0 s to 82.5 s. A dip is starting to develop on the free surface at the center of the tank at 15 s. Then it is instantly dragged downwards and it quickly passes through the liquid inside the tank [11]. When the dip is extended till the outlet of the tank at the drain time of 21 s, the air-core generation is completed.…”

Section: Generation Air-core Vortexmentioning

confidence: 99%

“…Driven from the problems above, numerous studies by previous researchers have been done to minimize the effect of air-core vortex formation on structure [11]- [16]. However, there is still no numerical study conducted on the relation between air-core vortex and reverse jet, which might be very beneficial for the future research.…”

Section: Introductionmentioning

confidence: 99%

A Simulation Study on Reverse Jet During Air-core Vortex Formation

Sakri¹

2019

IJATCSE

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The formation of air-core vortex is a common phenomenon during the draining process. However, there is an upward flow which is called as 'reverse jet' attempts during the air-core vortex formation. These phenomena if not properly controlled may reduce the efficiency and lifespan of liquid draining tank. Nevertheless, there is still no numerical research directed on the relation between air-core vortex and reverse jet, which might be very beneficial for the future study. Hence, the objective of this paper is to re revisits the fundamental physics flow of the reverse jet during the generation of air-core vortex.OpenFOAM®, an open source CFD package is used to simulate the flow inside the draining tank and the existence of reverse jet has been proved through the wake momentum thickness and Power-Spectral Density function (PSD).

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“…positive values of angular velocity and the red arrow with a counter clockwise direction symbolizes negative values of the angular velocity. Meanwhile, the axially rotating vortex in the central is formed by the angular momentum conservation since the fluid particles are moved from the side wall to the center by the draining [5]. According to Son et al [5], the liquid in the Taylor vortices cannot be combined with the rotating axially in the centre of the tank since it limits the liquid in the off area.…”

Section: Comparison Of Drainage Timementioning

confidence: 99%

“…Hence, when the air-core is formed, the interface between liquid and gas is better resolved. Son et al [5] have studied the grid resolution with three different grid systems. In the coarse (21x20x200) and medium (84x20x200) grid system, the air-core is not reproduced.…”

Section: Introductionmentioning

confidence: 99%

Benchmark on the Dynamics of Liquid Draining Inside a Tank

Sakri

Ali²,

Zaki³

2019

E3S Web Conf.

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Immense information and details observation of flow physics inside a draining tank can be achieved by adopting reliable numerical simulations. Yet the accuracy of numerical results has been always debatable and it is mainly affected by the grid convergence error and computational modeling approaches. Hence, this study is divided into two stages. In the first stage, this paper determines a systematic method of refining a computational grid for a liquid draining inside a tank using OpenFOAM software. The sensitivity of the computed flow field on different mesh resolutions is also examined. In order to study the effect of grid dependency, three different grid refinements are investigated: fine, medium and coarse grids. By using a form of Richardson extrapolation and Grid Convergence Index (GCI), the level of grid independence is attained. In this paper, a monotonic convergence criteria is reached when the fine grid has the GCI value below 10% for each parameter. In the second stage, different computational modeling approaches (DNS, RANS k-ε, RANS k-ω and LES turbulence models) are investigated using the finer grid from the first stage. The results for the draining time and flow visualization of the generation of an air-core are in a good agreement with the available published data. The Direct Numerical Simulation (DNS) seems most reasonably satisfactory for VOF studies relating air-core compared to other different turbulence modeling approaches.

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Numerical study of 3-D air core phenomenon during liquid draining

Cited by 25 publications

References 26 publications

Physical and Mathematical Simulation of Surface‐Free Vortex Formation and Vortex Prevention Design during the End of Casting in Tundish

Physical and Mathematical Simulation of Surface‐Free Vortex Formation and Vortex Prevention Design during the End of Casting in Tundish

A Simulation Study on Reverse Jet During Air-core Vortex Formation

Benchmark on the Dynamics of Liquid Draining Inside a Tank

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