首页> 美国卫生研究院文献>other >Multigrid Methods for A Mixed Finite Element Method of The Darcy-Forchheimer Model
【2h】

Multigrid Methods for A Mixed Finite Element Method of The Darcy-Forchheimer Model

机译:Darcy-Forchheimer模型的混合有限元方法的多重网格方法

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务,本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文,但由于OA文献来源多样且变更频繁,仍可能出现获取不到、文献不完整或与标题不符等情况,如果获取不到我们将提供退款服务。请知悉。

摘要

An efficient nonlinear multigrid method for a mixed finite element method of the Darcy-Forchheimer model is constructed in this paper. A Peaceman-Rachford type iteration is used as a smoother to decouple the nonlinearity from the divergence constraint. The nonlinear equation can be solved element-wise with a closed formulae. The linear saddle point system for the constraint is reduced into a symmetric positive definite system of Poisson type. Furthermore an empirical choice of the parameter used in the splitting is proposed and the resulting multigrid method is robust to the so-called Forchheimer number which controls the strength of the nonlinearity. By comparing the number of iterations and CPU time of different solvers in several numerical experiments, our multigrid method is shown to convergent with a rate independent of the mesh size and the Forchheimer number and with a nearly linear computational cost.
机译:构造了一种有效的非线性多重网格方法,用于Darcy-Forchheimer模型的混合有限元方法。使用Peaceman-Rachford类型的迭代作为平滑器将非线性与发散约束解耦。非线性方程可以用封闭公式逐元素求解。用于约束的线性鞍点系统被简化为泊松型对称正定系统。此外,提出了在分割中使用的参数的经验选择,并且所得的多重网格方法对于控制非线性强度的所谓的Forchheimer数是鲁棒的。通过在几个数值实验中比较不同求解器的迭代次数和CPU时间,我们证明了多网格方法收敛的速率与网格大小和Forchheimer数无关,并且具有近似线性的计算成本。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号