论文标题

模拟驱动的高级网格中的啤酒流体动力学优化

Simulation-Driven Optimization of High-Order Meshes in ALE Hydrodynamics

论文作者

Dobrev, Veselin, Knupp, Patrick, Kolev, Tzanio, Mittal, Ketan, Rieben, Robert, Tomov, Vladimir

论文摘要

在本文中,我们提出了用于高阶网格优化的工具,并在多物质任意的拉格朗日 - 欧拉(ALE)可压缩休克流体动力应用程序的背景下证明了它们的好处。网格优化过程是由使用优化网格(例如冲击位置,材料区域,已知误差估算等)提供的仿真提供的信息驱动的。这些仿真特征通常被离散地表示为Lagrangian网格上的有限元函数。输入的离散性质对于我们建议的算法的实际适用性至关重要,并将这项工作与严格需要分析信息的方法区分开来。我们的方法是基于节点通过KNUPP的目标矩阵优化范式(TMOP)的高阶扩展而进行的。所提出的公式是完全代数的,仅依赖于局部雅各布矩阵,因此它适用于所有类型的网格元素,分别为2D和3D,以及网格的任何顺序。我们讨论构建自适应靶矩阵并获得其衍生物,重建中间网格中离散数据的概念,可以改善全球网格质量的节点限制,同时保留依赖于空间的局部网格特征,并适当地归一化目标函数。适应性方法与自动啤酒触发器结合使用,这些触发器可以提供网格演化的鲁棒性并避免过度的重新映射程序。在高级啤酒应用程序中进行的几个模拟说明了新的高级TMOP技术的好处。

In this paper we propose tools for high-order mesh optimization and demonstrate their benefits in the context of multi-material Arbitrary Lagrangian-Eulerian (ALE) compressible shock hydrodynamic applications. The mesh optimization process is driven by information provided by the simulation which uses the optimized mesh, such as shock positions, material regions, known error estimates, etc. These simulation features are usually represented discretely, for instance, as finite element functions on the Lagrangian mesh. The discrete nature of the input is critical for the practical applicability of the algorithms we propose and distinguishes this work from approaches that strictly require analytical information. Our methods are based on node movement through a high-order extension of the Target-Matrix Optimization Paradigm (TMOP) of Knupp. The proposed formulation is fully algebraic and relies only on local Jacobian matrices, so it is applicable to all types of mesh elements, in 2D and 3D, and any order of the mesh. We discuss the notions of constructing adaptive target matrices and obtaining their derivatives, reconstructing discrete data in intermediate meshes, node limiting that enables improvement of global mesh quality while preserving space-dependent local mesh features, and appropriate normalization of the objective function. The adaptivity methods are combined with automatic ALE triggers that can provide robustness of the mesh evolution and avoid excessive remap procedures. The benefits of the new high-order TMOP technology are illustrated on several simulations performed in the high-order ALE application BLAST.

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