液态金属充型过程流动与传热数值模拟

根据有限差分法原理,对液态金属充型过程中同时发生的流动与传热过程,用在微小时间段内独立的流动与传热过程近似表示.结合温场数值模拟与流场数值模拟技术,开发铸件成形过程流动场与温度场耦合的数值模拟软件,并利用该软件对标准实验铸件充型过程进行耦合分析.研究结果表明:该方法不需要求解用能量平衡法建立的,考虑了流动对传热影响的复杂方程,有利于提高流动与传热耦合数值模拟的计算速度;自主开发的金属液态成形工艺分析系统的"耦合"计算功能是有效的,且计算精度较高.

Numerical Simulation on Fluid Flow and Heat Transfer during Mold Filling of Liquid Metal

Based on the theory of finite differential method,during tiny time spacing,concurrent fluid flow process and heat transfer process during mold filling of liquid metal may be approximately represented as independent fluid flow process and independent heat transfer process.A numerical simulation software about the coupling of temperature field and flow field for casting forming process has been developed by combining the temperature simulation and flow simulation,and the coupling analysis of the filling process for benchmark test casting is given using the software.The research results have shown that in this method there is no need to solve the complicated equations by considering the influence of flow on heat transfer and modelled by the law of conservation of energy,which will be beneficial for enhancing the computational speed about the numerical simulation of the coupling of flow and heat transfer.