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h-adaptivity and 'honest' GFEM for advection-dominated transport

机译:h-适应性和“诚实” GFEM用于对流主导的运输

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摘要

A standard two-dimensional Galerkin finite-element method (GFEM) code for coupled Navier-Stokes and energy equations is used with h-adaptive meshing based on a posteriori error estimation using the superconvergent patch recovery technique for solving a range of advection-dominated transport problems. It is demonstrated that such a method provides a highly effective, simple, and efficient way of dealing with the perennial problems in numerical modeling of advection-dominated transport, such as oscillations or wiggles with central difference-type discretizations (such as GFEM) and numerical ("false") diffusion when wiggle-suppressant schemes are used. Additionally, the auto-adaptive finite-element method provides a powerful means of achieving optimal solutions without having to pre-define a mesh, which may be either inadequate or too expensive. A number of benchmark problems are presented as application examples for this method before solving a problem of natural convection in an air-filled cavity with various orientations, for which experimental results are available. [References: 24]
机译:基于后验误差估计的标准二维Galerkin有限元方法(GFEM)代码用于Navier-Stokes和能量方程耦合,并使用超收敛斑片恢复技术基于后验误差估计,以求解对流占主导地位的输运问题。证明了这种方法提供了一种高效,简单和有效的方法来处理对流主导的输运过程中的多年生问题,例如具有中心差分类型离散化(例如GFEM)和数值的振荡或摆动。 (“假”)扩散,当使用摆动抑制方案时。此外,自适应有限元方法提供了一种强大的手段,可以实现最佳解决方案而不必预先定义网格,因为网格可能不够或太昂贵。在解决具有不同方向的充气腔中的自然对流问题之前,提出了许多基准问题作为该方法的应用实例,为此可获得实验结果。 [参考:24]

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