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이병서(Byoung Seo Lee),이주명(Ju Myoung Lee),이준식(Joon Sik Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
A computer program for unstructured grid system is developed, which can describe unsteady fluid flow and heat transfer by the fractional step method and SIMPLE method. The governing equations are discretised based upon the finite concept method, a kind of finite volume method. The validity of the program is established in comparison with the benchmark solutions, which shows good agreements with both two methods. The present study reports difference in computational time depending on two different methods and flow types.
정재동(Jae Dong Chung),이주명(Ju Myoung Lee),이준식(Joon Sik Lee) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.3
This paper presents a numerical analysis on the solidification characteristics in twin-roll strip casting. Unstructured fixed-grid system was employed to deal with phase change. Melting of pure gallium was analyzed to confirm the validity of present program in both structure and unstructured grid system. An algorithm for simultaneous calculation of the temperature in the roll and the molten metal pool was developed. The flow field in the pool and heat transfer features between pool and roll were showed. The effect of process parameters was also studied. Since the geometry of the molten metal pool significantly deforms along the casting direction, unstructured grid system is more efficient. The unstructured grid system gives almost the same accuracy, even though the number of grids is only 60% of the structured one.