Numerical sirnulation of heat, mass and momentum transport behaviours in directionally solidifying alloy castings under electromagnetic fields using an extended Direct-SIMPLE scheme

作者：Xu DM^*; Bai YF; Guo JJ; Fu HZ

来源：International Journal for Numerical Methods in Fluids, 2004, 46(7): 767-791.

DOI：10.1002/fld.773

• extended Direct-SIMPLE scheme
• continuum model
• primitive variable form
• electromagnetic
• electro-magnetic/gravity-/solidification shrinkage-driven flow
• solidification transport phenomena
• directional solidification of shaped alloy castings

A Direct-SIMPLE scheme is further extended for numerical simulations of heat and species mass transfer, and liquid flow behaviours in solidification processes of shaped alloy castings under various electromagnetic (EM) fields, based on a binary continuum model (a solidification transport phenomena/ processes (STP)-based dendrite solidification model). Unlike in a SIMPLE scheme, no iterative computations are needed to achieve the final pressure and Velocity Corrections in the extended Direct-SIMPLE procedure, therefore extremely high computational efforts can be avoided. Using three different types of model alloys, pseudo-binary In718 base-4.85wt% Nb, gamma(TiAl)-55 at% Al and Al-4.5 v wt% Cu systems, sample computations for solving strongly coupled solidification transport phenomena in directionally solidifying shaped castings under static and harmonic EM-fields of different strengths are carried out, to demonstrate the feasibility and efficient calculation performance of the present model and numerical method!;.

• 出版日期2004-11-10
• 单位哈尔滨工业大学