Development of a New Simulation Method of Mold Filling and Solidification Based on the SIMPLER Algorithm

Mok, Jungbin; Hong, Chun Pyo; Lee, J.

doi:10.2355/isijinternational.43.1206

Cited by 4 publications

(2 citation statements)

References 8 publications

(17 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6][7][8][9][10] For example, the thermal-driven buoyancy flow (also called natural convection, thermal convection or non-isothermal flow in some papers) in tundish and ladle with large volume capacity of liquid steel has been widely studied. [11][12][13][14] It is thought that non-isothermal flow has an obvious influence on the temperature distribution and inclusion removal in tundish and ladle.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Thermal-driven Buoyancy Flow in the Steady Macro-solidification Process of a Continuous Slab Caster

Qiu

Peng

et al. 2004

ISIJ International

View full text Add to dashboard Cite

The role of thermal-driven buoyancy flow in the steady macro-solidification process of a continuous slab caster and its effect on the predicted flow and temperature distribution are discussed by combining the non-dimensional analysis and the predicted results obtained from a steady three-dimensional coupled fluid flow, heat transfer and macro-solidification model. Results show that the relative strength among the thermal-driven buoyancy flow, the forced flow caused by the SEN impinging jet and the fluid flow through the porous matrix of mushy-zone continuously changes. The strength of thermal-driven buoyancy flow in the mold and sub-mold zone of slab caster is dependent on the characteristic flow velocity, temperature difference and the porosity-permeability ratio relation. The convection flow caused by thermal buoyancy at liquidus temperature of steel can result in the occurrence of local turbulence. The obvious effect zone of the thermal buoyancy flow on the predicted flow and temperature is in the region where the forced flow has become inferior and the mushy porous flow does not play a dominant role.KEY WORDS: continuous slab caster; solidification; thermal-driven buoyancy flow; numerical simulation.liquid steel and solid steel is regarded as the constant value and Boussenisque's approximation is used to consider the thermal-driven buoyancy flow. 3) The low-Reynolds number k-e turbulent model of Lam and Bremhorst is utilized to consider the turbulent flow in the mold. Boundary ConditionsAll general initial and boundary conditions for simulation on a continuous slab caster have been noted in several references. 18,22) The specified coordinate and grid system for a given caster in the present study is shown in Fig. 1. The geometrical parameters and operating conditions of this caster are summarized in Table 1. The value of the Darcy coefficient is adopted in concert with the work of Seyedein et al. 18) and the values of various turbulent constants are assigned by the reference. 23)It is very difficult to determine the mold heat flux due to the existing gas gap between the mold and the shell. A simple local heat flux formulation obtained by the measurement of the mold water volume and water temperature difference between the inflow and the outflow of cooling water is employed, as given by: At the strand surface below the mold, the values of heat transfer flux from the strand surface to the environment are governed by combination of three heat-transfer mechanisms: conduction, convection and radiation. Therefore, it is very difficult to decide the combined heat-transfer coefficient and a trial and error study procedure is adopted, which can be simply outlined as follows: 1) the known spray cooling water volume obtained from the plant's database is inputted into the known empirical or semi-empirical formulations 24) to calculate the combined heat transfer coefficient in different segments of the caster; 2) the heat transfer coefficient is used as the boundary condition to obtain the calculated surface temperatu...

show abstract

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Thermal-driven Buoyancy Flow in the Steady Macro-solidification Process of a Continuous Slab Caster

Qiu

Peng

et al. 2004

ISIJ International

View full text Add to dashboard Cite

show abstract

“…Two or more phases separated by sharp interface share a single velocity field which is solved in an Eulerian framework. This method was primarily developed for modeling issues of stratified flow, slug flow, wave, splash, Kelvin-Helmholtz instability, and bubble/droplet formation, but metallurgists introduced it for the electro-slag remelting (ESR) [29,30], the mold filling and gas entrapment [31][32][33], the droplet dynamics in spraying coating process [34], and the formation of solidification shrinkage cavities [35].…”

mentioning

confidence: 99%

Volume-Averaged Modeling of Multiphase Flow Phenomena during Alloy Solidification

Ludwig

Kharicha

2019

Metals

View full text Add to dashboard Cite

The most recent developments and applications in volume-averaged modeling of solidification processes have been reviewed. Since the last reviews of this topic by Beckermann and co-workers [Applied Mech. Rev. 1993, p. 1; Annual Rev. Heat Transfer 1995, p. 115], major progress in this area has included i) the development of a mixed columnar-equiaxed solidification model; ii) further consideration of moving crystals and crystal dendritic morphology; and iii) the model applications to analyze the formation mechanisms of macrosegregation, as-cast structure, shrinkage cavity and porosity in different casting processes. The capacity of computer hardware is still a limiting factor. However, many calculation examples, as verified by the laboratory casting experiments, or even by the casting processes at a small industrial scale, show great application potential. Following the trend of developments in computer hardware (projection according to Moore’s law), a full 3D calculation of casting at the industry scale with the multiphase volume-averaged solidification models will become practically feasible in the foreseeable future.

show abstract

The mathematical model of solidification latent heat under high cooling rate

Yao

Xuena

Dai

et al. 2006

Heat Trans. Asian Res.

View full text Add to dashboard Cite

Treatment of solidification latent heat is a key point in solidification simulation by the finite difference method. When latent heat is dealt with in a traditional method of equivalent latent heat, it was found that heat was increased when casting with a high cooling rate, and then the simulation result was distorted. In this paper, a new method is proposed to deal with solidification latent heat. Moreover, a mathematical model was suggested, in which the latent heat can be dealt with accurately under high or normal cooling rates. By contrasting the simulation results from this new method with the traditional one, it was indicated that this new model can obtain more accurate simulation results than the traditional model under high or normal cooling rates.

show abstract

Development of a New Simulation Method of Mold Filling and Solidification Based on the SIMPLER Algorithm

Cited by 4 publications

References 8 publications

Numerical Analysis of Thermal-driven Buoyancy Flow in the Steady Macro-solidification Process of a Continuous Slab Caster

Numerical Analysis of Thermal-driven Buoyancy Flow in the Steady Macro-solidification Process of a Continuous Slab Caster

Volume-Averaged Modeling of Multiphase Flow Phenomena during Alloy Solidification

The mathematical model of solidification latent heat under high cooling rate

Contact Info

Product

Resources

About