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LARGE EDDY SIMULATIONS OF TRANSIENT TURBULENT FLOW DURING CONTINUOUS SLAB CASTING OF STEEL

Quan Yuan
Department of Mechanical and Industrial Engineering University of Illinois at Urbana-Champaign 1206 W Green Street, Urbana, IL 61801 USA

Surya P. Vanka
Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, 1206 W Green Street, Urbana, IL, 61801, USA

Brian G. Thomas
Department of Mechanical Science and Engineering, University of Illinois at Urbana Champaign, Urbana, IL 61801, USA; Colorado School of Mines, Golden, CO 80401, USA

Resumo

Three LES computations are presented which simulate the turbulent flow in the liquid-pool during continuous casting of steel. LES is first compared with PIV measurements on a O.4-scale water model to gauge the accuracy. It is then applied to a steel caster and its corresponding water model. The velocity fields in the liquid-pool are quantified with instantaneous, mean and rms values. Transient asymmetries are found both across the top surface and in the lower recirculation zone between the left and right halves, which is an important feature of this flow. Interaction between the two halves is found to be an important cause of the asymmetries. Half-pool simulations inherently miss the asymmetry and the consequent oscillations. This work also quantifies the difference between flow in the steel caster and constructed water models of the process. Finally the top surface liquid level and its fluctuations are predicted and compared with plant data.