JFNK方法迭代过程与物理约束
Iteration Process of JFNK Method and Physical Constraints
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摘要: 对Jacobian-free Newton-Krylov(JFNK)方法迭代过程进行分析,通过在迭代过程中吸收物理约束信息,对JFNK方法进行改进.改进后的JFNK方法迭代过程中的迭代序列总是满足物理约束,克服了迭代过程中可能出现的非物理现象.采用改进之后的算法求解二维三温能量方程,可以保证在迭代过程中不会出现负温度问题,使JFNK方法的健壮性得到提高.Abstract: Jacobian.free Newton-Krylov(JFNK) method is analyzed and improved by using physical constraints in iteration. Consequently.physical constraints are always satisfied in iteration process of the improved JFNK method.Non。physical phenomenon is avoided.In particular.there is no negative temperature as the method is used for 2-D 3-T energy equations.Robustness of JFNK method is improved.
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