Title£º Prediction of mushy zone permeability of Al-4.5wt.%Cu alloy during solidification by phase field model and CFD simulation
Author£º Long-fei Li1, *Rui-jie Zhang1, Shi-jie Hu1, Dan Zhang1, Shi-di Yang2, Chang-sheng Wang3, and Hai-tao Jiang1
Address£º 1. University of Science and Technology Beijing, Beijing 100083, China 2. Sanying Precision Instruments Company Limited, Tianjin 300399, China 3. University of Shanghai for Science and Technology, Shanghai 200093, China
Key words£º phase field model; mushy zone; computational fluid dynamics; permeability; solidification
CLC Nmuber£º TG146.21/TP391.9
Document Code£º A
Article ID£º 1672-6421(2019)05-313-06

Liquid permeability of the mushy zone is important for porosity formation during the solidification process. In order to investigate the permeability of the mushy zone, an integrated model was developed by combining the phase field model and computational fluid dynamics (CFD) model. The three-dimensional multigrain dendrite morphology was obtained by using the phase field model. Subsequently, the computer-aided design (CAD) geometry and mesh were generated based on calculated dendrite morphologies. Finally, the permeability of the dendritic mushy zone was obtained by solving the Navier-Stokes and continuity equations in ANSYS Fluent software. As an example, the dendritic mushy zone permeability of Al-4.5wt%Cu alloy and its relationship with the solid fractions were studied in detail. The predicted permeability data can be input to the solidification model on a greater length scale for macro segregation and porosity simulations.