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arXiv 2203.03115math.DS
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不变流形的参数化有限元逼近

Finite Element Approximation of Invariant Manifolds by the Parameterization Method

Jorge Gonzalez, J. D Mireles-James, Necibe Tuncer

摘要:

将不变流形的参数化方法与椭圆型偏微分方程的有限元法相结合,得到了非线性抛物型偏微分方程不稳定平衡解的不变流形的高阶近似计算框架.参数化方法提供了一个无穷小不变方程的不变流形,我们解决了通过一个幂级数的animator。一个幂匹配的论点导致一个递归系统的线性椭圆偏微分方程-所谓的同调方程-其解决方案是幂级数系数的参数化。使用有限元近似,将同调方程递归地求解到任何期望的阶。最终结果是流形的图表映射的多项式展开,其系数在适当的有限元空间中。我们实现了各种示例问题的方法,具有多项式和非多项式非线性,非凸二维多边形域(不一定简单连接),莫尔斯指数1和2的平衡解。我们实现了后验误差指标,提供了数值证据,支持索赔的流形计算准确。

英文摘要:

We combine the parameterization method for invariant manifolds with the finite element method for elliptic PDEs,to obtain a new computational framework for high order approximation of invariant manifolds attached to unstable equilibrium solutions of nonlinear parabolic PDEs. The parameterization method provides an infinitesimal invariance equation for the invariant manifold, which we solve via a power series ansatz. A power matching argument leads to a recursive system of linear elliptic PDEs -- the so-called homological equations -- whose solutions are the power series coefficients of the parameterization. The homological equations are solved recursively to any desired order using finite element approximation. The end result is a polynomial expansion for a chart map of the manifold, with coefficients in an appropriate finite element space. We implement the method for a variety of example problems having both polynomial and non-polynomial nonlinearities, on non-convex two-dimensional polygonal domains (not necessary simply connected), for equilibrium solutions with Morse indices one and two. We implement a-posteriori error indicators which provide numerical evidence in support of the claim that the manifolds are computed accurately.

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