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NIPPON STEEL TECHNICAL REPORT No 89 January 2004 46 UDC 621 746 27 681 3 1 Environment the darker the area the larger the value It is seen in the figure that the whole molten steel in the mold is significantly disturbed by the in flux from the nozzle It is considered that the turbulence becomes significant as the speed of the incoming flow becomes high show ing itself as the rippling of the molten steel surface As stated above it has been demonstrated that a molten steel flow analysis model enables a realistic mold level control simulation reflecting the turbulence of molten steel flow 5 Closing A mold level control model applying molten steel flow analysis has been formulated and thus a realistic mold level control simula tion reflecting the turbulence of molten steel flow has been made possible The effectiveness of the developed model has been con firmed through simulations A mold level control system based on the developed model will be designed for application to high speed casting operation and its effectiveness will be evaluated through tests in actual operation References 1 Suzuki D et al Level Control Model by Numerical Fluid Dynamics Method Proceedings of the Fourth International Conference on Intelli gent Processing and Manufacturing of Materials IPMM 03 2003 CD ROM Fig 8 Mold steel level chart in commercial operation Fig 9 Average molten steel level in mold analysis Fig 10 Standard deviation of molten steel level in mold analysis 2 5 2 0 1 5 1 0 0 0 5 1 0 1 5 N X Fig 11 Distribution of time average of molten steel flow rate at mold thickness center analysis 2 5 2 0 1 5 1 0 0 0 5 1 0 1 5 N X 0 0 40 30 250 20 150 10 05 0 35