2-Dimensional FEM modeling of macrosegregation in the directional solidification with mesh adaptation  

作　　者：Weitao LIU Changchuan XIE Michel Bellet Hervé Combeau 

机构地区：[1]Beijing Metallurgical Technology Research Institute, CCTEC Engineering Corporation Limited, Beijing 100081, China [2]School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China [3]Ecole des Mines de Paris, Sophia Antipolis, 06904, France and Ecole des Mines de Nancy, Nancy, 54042,France

出　　处：《Acta Metallurgica Sinica(English Letters)》2009年第3期233-240,共8页金属学报（英文版）

摘　　要：In order to improve the prediction accuracy of macrosegregation channel, an algorithm for dynamic remeshing is proposed. The basic idea is to generate fine elements near the liquidus isotherm. The norm of the gradient of solid fraction is used for piloting the remeshing in the mushy zone; whereas, the objective mesh size in the liquid is considered as a function of the distance to the liquidus isotherm. The efficiency of mesh adaptation is demonstrated by prediction of macrosegregation channel in a case of unidirectional solidification.In order to improve the prediction accuracy of macrosegregation channel, an algorithm for dynamic remeshing is proposed. The basic idea is to generate fine elements near the liquidus isotherm. The norm of the gradient of solid fraction is used for piloting the remeshing in the mushy zone; whereas, the objective mesh size in the liquid is considered as a function of the distance to the liquidus isotherm. The efficiency of mesh adaptation is demonstrated by prediction of macrosegregation channel in a case of unidirectional solidification.

关 键 词：FRECKLE SOLIDIFICATION Modeling Adaptive remeshing 

分 类 号：TF771.2[冶金工程—钢铁冶金] TQ336.1[化学工程—橡胶工业]