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

Weitao Liu (1, 2) , Changchuan Xie (3) , Michel Bellet (2) , Hervé Combeau (4)

1 Beijing Metallurgical Technology Research Institute
2 CEMEF - Centre de Mise en Forme des Matériaux
3 School of Metallurgical and Ecological Engineering
4 LSG2M - Laboratoire de Science et Génie des Matériaux et de Métallurgie

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.

Mots clés: Modeling; Adaptive remeshing; Freckle; Solidification

Domaines: Matériaux

Weitao Liu, Changchuan Xie, Michel Bellet, Hervé Combeau. 2-Dimensional FEM modeling of macrosegregation in the directional solidification with mesh adaptation. Acta Metallurgica Sinica, 2009, 22 (3), pp.233-240. ⟨10.1016/S1006-7191(08)60094-0⟩. ⟨hal-00509211⟩