抄録
Calculation time reduction of finite difference solidification analysis by implicit-explicit FDM combines mingles implicit and explicit methods (hereafter called the hybrid method) was investigated. The hybrid method was proposed in 1991 to reduce the calculation time of finite difference heat analysis for transient heat transfer. This paper describes the application of the hybrid method to finite difference solidification analysis. Also, the relationship between calculation time reduction and calculation accuracy was investigated. In hybrid method applied FDM solidification analysis, estimated solidification time was found to always deviate from the full-explicit results while the estimated macro shrinkage porosity did not deviate that much. The preferned results of below 1.1% solidification time deviation from full explicit calculation were obtained in this case when time step magnification was between 2 and 4.
