Scale-Adaptive Simulation of Transient Two-Phase Flow in Continuous-Casting Mold

Journal Article · Fri Feb 15 04:00:00 EST 2019 · Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science

DOI:https://doi.org/10.1007/S11663-018-1443-0· OSTI ID:22933604

Liu, Zhongqiu ^[1]; Vakhrushev, Alexander; Wu, Menghuai; Kharicha, Abdellah ^[2]; Ludwig, Andreas ^[3]; Li, Baokuan ^[1]

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1. Northeastern University, School of Metallurgy (China)
2. Montanuniversität Leoben, Christian Doppler Laboratory for Advanced Process Simulation of Solidification and Melting (Austria)
3. Montanuniversität Leoben, Chair of Simulation and Modeling of Metallurgical Processes Department of Metallurgy (Austria)

Scale-adaptive simulation (SAS) of the transient gas–liquid two-phase flow in a laboratory-scale continuous-casting mold is presented. The main objective is to investigate the applicability of the scale-adaptive unsteady Reynolds-averaged Navier–Stokes turbulent model (URANS SAS) for predicting the transient multiscale turbulent structures in a two-phase flow. Good quantitative agreements with the experimental data and the large eddy simulation (LES) results are obtained both for the time-averaged velocity field and for the transient turbulent characteristics. The introduction of the von Karman length-scale into the turbulence-scale equation allows the SAS model to dynamically adjust to the resolved turbulent structures. The LES-like pulsating behavior of the air gas and the large-scale liquid eddy magnitudes in the unsteady regions of flow field are captured by the SAS model. The classical − 5/3 law of power spectrum density (PSD) of the axial velocity is kept properly for the single-phase turbulent flow. For two-phase flow, the decay of PSD is too steep at the high-frequency region; the predicted PSD obtained with SAS is damped stronger than that estimated by LES. The SAS model offers an attractive alternative to the existing LES approach or to the other hybrid RANS/LES models for strongly unsteady flows.

• OSTI ID: 22933604
• Journal Information: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science, Journal Name: Metallurgical and Materials Transactions. B, Process Metallurgy and Materials Processing Science Journal Issue: 1 Vol. 50; ISSN MTBSEO; ISSN 1073-5615
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
AIR
CASTING MOLDS
EXPERIMENTAL DATA
LARGE-EDDY SIMULATION
LIQUIDS
NAVIER-STOKES EQUATIONS
REYNOLDS NUMBER
SPECTRAL DENSITY
TURBULENT FLOW
TWO-PHASE FLOW
UNSTEADY FLOW