常微分方程的不变变分格式
Invariant Variational Schemes for Ordinary Differential Equations
摘要：
我们提出了一种新的算法方法来构造不变的变分格式的常微分方程系统，这是一个变分原理的欧拉-拉格朗日方程。该方法是基于标准的，非不变的离散拉格朗日泛函使用等变活动标架的不变性。不变变分格式由相应的不变离散拉格朗日泛函的欧拉-拉格朗日方程给出。我们展示了这种一般的方法，通过构建不变的变分方案的常微分方程，保持变分和发散对称性的相关连续拉格朗日。Noether定理自动地意味着所得到的格式是完全保守的。进行了数值模拟，并表明这些不变的变分方案优于标准的数值离散。
英文摘要：
We propose a novel algorithmic method for constructing invariant variational schemes of systems of ordinary differential equations that are the Euler-Lagrange equations of a variational principle. The method is based on the invariantization of standard, non-invariant discrete Lagrangian functionals using equivariant moving frames. The invariant variational schemes are given by the Euler-Lagrange equations of the corresponding invariantized discrete Lagrangian functionals. We showcase this general method by constructing invariant variational schemes of ordinary differential equations that preserve variational and divergence symmetries of the associated continuous Lagrangians. Noether's theorem automatically implies that the resulting schemes are exactly conservative. Numerical simulations are carried out and show that these invariant variational schemes outperform standard numerical discretizations.
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