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arXiv 2007.08924math.NAcs.NA
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六步BDF方法的能量技术

The energy technique for the six-step BDF method

Georgios Akrivis, Minghua Chen, Fan Yu, Zhi Zhou

摘要:

结合Grenander-Szegö定理,我们观察到一个比Nevanlinna-Odeh乘子的基本要求(即乘子各分量的绝对值之和严格小于$1$)更宽松的乘子正性条件,使得能量技术适用于具有自伴椭圆部分的抛物型方程的BDF方法的稳定性分析.这对于不存在Nevanlinna-Odeh乘子的六步BDF方法特别有用。我们在六步BDF方法中引入了满足正性的乘子,并证明了该方法对抛物型方程的稳定性。

英文摘要:

In combination with the Grenander--Szegö theorem, we observe that a relaxed positivity condition on multipliers, milder than the basic %fundamental requirement of the Nevanlinna--Odeh multipliers that the sum of the absolute values of their components is strictly less than $1$, makes the energy technique applicable to the stability analysis of BDF methods for parabolic equations with selfadjoint elliptic part. This is particularly useful for the six-step BDF method for which no Nevanlinna--Odeh multiplier exists. We introduce multipliers satisfying the positivity property for the six-step BDF method and establish stability of the method for parabolic equations.

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