A NESTED NEWTON-TYPE ALGORITHM FOR FINITE VOLUME METHODS SOLVING RICHARDS' EQUATION IN MIXED FORM

被引:74
|
作者
Casulli, Vincenzo [1 ]
Zanolli, Paola [2 ]
机构
[1] Univ Trent, Dept Civil & Environm Engn, Lab Appl Math, I-38050 Trento, Italy
[2] Univ Trent, Dept Math, I-38050 Trento, Italy
关键词
Richards' equation; variably saturated flow; finite volume; mildly nonlinear systems; Jordan decomposition; nested iterations; VARIABLY SATURATED FLOW; CONSERVATIVE NUMERICAL-SOLUTION; POROUS-MEDIA; UNSATURATED FLOW; SOILS;
D O I
10.1137/100786320
中图分类号
O29 [应用数学];
学科分类号
070104 ;
摘要
A finite volume discretization of the mixed form of Richards' equation leads to a nonlinear numerical model which yields exact local and global mass conservation. The resulting nonlinear system requires sophisticated numerical strategies, especially in a variable saturated flow regime. In this paper a nested, Newton-type algorithm for the discretized Richards' equation is proposed and analyzed. With a judicious choice of the initial guess, the quadratic convergence rate is obtained for any time step size and for all flow regimes.
引用
收藏
页码:2255 / 2273
页数:19
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