非牛顿流体注射充模过程的谱分析与二维模拟

为计算热塑性材料在薄的中心开口的圆盘注射充模过程的温度场，速度场和压力场，利用切比雪夫配置法和快速富立叶变换，提出了快速收敛和稳定的计算模型，计算结果和实验结果非常吻合，本文考虑了熔体的非牛顿性和过程的非等温性、非定常性以及计算区域的非定常性，对充模过程各时刻都进行了数值分析；对于时间方向的积分采用Ｃｒａｎｋ－Ｎｉｃｏｌｓｏｎ格式，空间方向的积分采用谱方法［１］。

SPECTRAL ANALYSIS AND TWO -DIMENSIONAL SIMULATION OF THE INJECTION OF THE INJECTION MOLD-FILLING PROCESS FOR A NON-NEWTONIAN FLUID

The C hebyshev collocat ion met hod and Fast Fourier Transform ( FFT)is employed for computing the temperature,pressure, and velocity fields in a flat thin center-fed disk-cavity for the flow of thermoplastic materials. The cavity-filling process is treatedas a transient and non-isothermal flow of a non-Newtonian flnid with moving bonndary Inthe nnmerical scheme the spatial discretization is spectral but the temporal discretizationuses covent ional Crank-Nicolson finite-difference,Goo d agreement is obtained between thecomputed resuts and experimental observations.