薄壁门窗型材挤压的有限体积分步模拟

研究了有限体积分步求解方法,实现了各分步有限体积模拟系统的数据传递和信息继承.针对薄壁门窗型材制品壁薄且纵向尺寸大的特点,采用了有限体积分步模拟方法对其挤压成形进行了模拟,并与有限元模拟、有限体积一步模拟进行了对比.结果表明:1)有限元模拟往往会因为网格重划分问题造成模拟结果严重失真;2)有限体积法-步模拟又对计算机资源有较高要求,往往会因为内存不足造成计算无法进行下去;3)有限体积分步模拟方法模拟精度最高,可以很好地解决大尺寸薄壁型材制品挤压成形的数值模拟问题.

Simulation of thin-walled aluminum decoration part extrusion process with multi-stage finite volume method

The key technology for multi-stage finite volume method simulation was studied, and data transfer and information inheritance between successive stages were fulfilled. In accordance with the characteristics of an aluminum window part with thin wall and relatively large longitudinal dimension, its extrusion process is simulated with finite volume multi-stage simulation method, whose result is compared with those of finite element method and finite volume one step method. The simulation results reveal that the finite element method results in distorted product shape due to frequent mesh rezoning; computation with one step finite volume method needs too much computer memory; the multi-stage finite volume method can solve the memory-shortage problem in numerical simulation of large-dimensionally thin-walled aluminum profile parts and the highest accuracy is obtained.