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arXiv 2302.02680math.NAcs.NA
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曲面网格下一类具有Ventcel边界条件的扩散方程的数值研究

Numerical study of a diffusion equation with Ventcel boundary condition using curved meshes

Fabien Caubet, Joyce Ghantous, Charles Pierre

摘要:

本文对一个在区域边界上含有二阶项的扩散问题进行了数值研究(Laplace-Beltrami算子)称为\textit{Ventcel problem}。研究了Ventcel问题的变分形式,导致有限元离散。重点是诉诸高阶曲面网格的物理域的离散。计算误差进行了调查,无论是在条款几何误差和有限元近似误差,分别与网格度$r\ge 1$和有限元度$k\ge 1$相关。我们领导的数值实验,使我们能够制定一个猜想的\textit{a priori}误差估计取决于两个参数$r$和$k$。此外,这些误差估计依赖于一个功能\textit{lift}的定义与适应的边界上的属性移动数值解上定义的计算域的物理。

英文摘要:

In this work is provided a numerical study of a diffusion problem involving a second order term on the domain boundary (the Laplace-Beltrami operator) referred to as the \textit{Ventcel problem}.A variational formulation of the Ventcel problem is studied, leading to a finite element discretization.The focus is on the resort to high order curved meshes for the discretization of the physical domain.The computational errors are investigated both in terms of geometrical error and of finite element approximation error, respectively associated to the mesh degree $r\ge 1$ and to the finite element degree $k\ge 1$. The numerical experiments we led allow us to formulate a conjecture on the \textit{a priori} error estimates depending on the two parameters $r$ and $k$. In addition, these error estimates rely on the definition of a functional \textit{lift} with adapted properties on the boundary to move numerical solutions defined on the computational domain to the physical one.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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