摘要
中心差分格式选用粗网格离散土壤水盐运移方程中的对流项时,数值解容易发生数值振荡.采用一种三阶精度的离散格式———QUICK格式可以有效地降低数值振荡这一“伪物理”现象.引用几个数值模型,通过与解析解的比较说明了QUICK格式对提高模拟结果准确性具有较好的作用,为分析一维土壤水分垂直运动问题离散格式的稳定性提供科学依据.
The central differencing scheme often leads to unstable numerical results in condition of coarse net. Several numerical models were discussed, including QUICK scheme. QUICK scheme, a discrete scheme of third order accuracy, can be descended effectively the fake physical phenomena. Some numerical results are presented to illustrate the discussion. It will offer basis for analyzing the stability of discrete scheme in one-dimensional problems of vertical transportation between soil water and salt.
出处
《农业科学研究》
2006年第2期70-73,共4页
Journal of Agricultural Sciences
基金
国家民委研究项目(2002127)
宁夏高教科技基金项目(2005153-62)
关键词
QUICK格式
土壤水盐
对流项
有限体积法
QUICK scheme
soil water and salt
convection terms
finite volume method
