Using the interface Peclet number to select the maximum simulation interface width in phase-field solidification modelling

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• 作者：Y. Xie^a ; H.B. Dong^a ; ^{hd38@le.ac.uk} ; J.A. Dantzig^b ; ^c
• 关键词：Dendritic solidification ; Phase-field modelling ; Peclet number ; Steels
• 刊名：Computational Materials Science
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：70
• 期：Complete
• 页码：71-76
• 全文大小：398 K

文摘

This study investigates the use of interface Peclet number P = w/(D_l/V_tip), to determine the interface width (w) used in phase-field simulations, where D_l is the liquid diffusivity and V_tip is the tip velocity. The maximum simulation interface width (w_max) under varied growth conditions was analysed via convergence analysis and it was found that there is a limit of P for the maximum interface width at various velocities. Converged results can be obtained only when w < w_max = 0.075D_l/V_max where V_max is the maximum growth velocity during transient solidification. The effect of the inclusion of finite solid diffusivity on the P limit in selecting w_max was analysed, and little influence was observed.