FENG Xuanyan, YAN Zhenguo, ZHU Huajun, et al. Study on the convergence criterion of linear iteration in inexact Newton methods[J]. 2023, 41(12): 28-36.
FENG Xuanyan, YAN Zhenguo, ZHU Huajun, et al. Study on the convergence criterion of linear iteration in inexact Newton methods[J]. 2023, 41(12): 28-36.DOI: 10.7638/kqdlxxb-2023.0001.
Study on the convergence criterion of linear iteration in inexact Newton methods
Newton-like iteration methods are usually used for implicit time stepping to solve large scale nonlinear systems. Each of the nonlinear iterative step requires solving large linear equations composed of a Jacobian matrix of the nonlinear system
and the error of solving such linear equations can have a significant impact on the convergence of the nonlinear system. However
the convergence criterion of the linear iteration is less studied when the Jacobian matrix error exists in the Newton method. Aiming at the above problem
this work first presents the Newton iterative formula with both the Jacobian matrix error and the linear iteration error
and verifies the significant influence of the Jacobian matrix error on the iteration through numerical tests. Then
two different types of linear iterative convergence criteria are tested numerically
and the produced over-solving problem is investigated at the presence of Jacobian matrix error. Finally
a new convergence criterion of the linear iteration is developed based on two of the previous convergence criteria. Numerical tests suggest that the proposed method is effective to relieve over-solving problems
thus improves the computational efficiency.
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