PDP放电特性二维流体数值模拟的加速方法

Speeding up method in 2D fluid numerical simulation of PDP discharge characteristics

针对PDP气体放电的流体模型,采用指数方法(Scharfetter-Gummel)和电场半隐格式对新型荫罩式PDP显示单元结构的放电过程进行数值模拟.研究时间步长和空间网格大小的变化对模拟结果的影响和对计算速度的改进,结果表明利用半隐格式求解电场可以大大提高时间步长,同时可以在电场变化不显著的方向上粗分网格,从而达到既保证计算精度又提高计算速度的目的.针对新型荫罩式PDP显示单元结构的实例计算结果表明,使用半隐格式求解电场可使计算速度提高80倍左右.同时根据放电单元的结构和放电空间的电场分布,在电场变化不显著的方向粗分网格从5μm增大到20μm,可使计算时间比原来减少80%左右.

The discharge characteristics in a display cell of the novel Shadow-Mask plasma display panel （SM-PDP） are simulated by the fluid model. The exponential expression of Scharfetter-Gummel is adopted and a semi-implicit scheme to the electric field is applied to solve the fluid equation. The influence of the time step and the mesh size to the simulation results and the calculation speed is discussed. The results indicate that the calculation speed is greatly improved by the semi-implicit scheme to increase the time step and increasing the mesh size at the direction where the electric field does not change markedly. For the SM-PDP cell structure, the calculation speed with the novelmethod is 80 times faster than those with the conventional way. The mesh size is increased from 5μm to 20μm at the direction where the electric field does not change markedly, so the calculation time can be decreased by about 80% compared with that of the conventional mesh size.