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arXiv 2108.03757math.NAcs.DScs.NA
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任意域中的可伸缩自适应PDE求解器

Scalable adaptive PDE solvers in arbitrary domains

Kumar Saurabh, Masado Ishii, Milinda Fernando, Boshun Gao, Kendrick Tan, Ming-Chen Hsu, Adarsh Krishnamurthy, Hari Sundar, Baskar Ganapathysubramanian

摘要:

高效、准确地模拟任意定义的几何中或周围的偏微分方程(PDE),特别是具有高水平的自适应性,对于不同的应用领域具有重要意义。上述过程中的一个关键瓶颈是快速构建一个“好的”自适应加细网格。在这项工作中,我们提出了一种有效的新的基于八叉树的自适应离散化途径的方法,能够雕刻出任意形状的空白区域从父域:流体模拟复杂的对象周围的基本要求。分割对象会产生一个$\textit{incomplete}$八叉树。我们开发了高效的自顶向下和自底向上遍历方法来执行有限元计算$\textit{incomplete}$八叉树。我们验证的框架(a)显示适当的收敛分析和(b)计算阻力系数流过一个球体的雷诺数($\mathcal{O}(1-10^6)$)范围广泛,包括阻力危机制度。最后,我们将该框架部署在当前项目的现实几何图形上,以评估COVID-19在教室中的传播风险。

英文摘要:

Efficiently and accurately simulating partial differential equations (PDEs) in and around arbitrarily defined geometries, especially with high levels of adaptivity, has significant implications for different application domains. A key bottleneck in the above process is the fast construction of a `good' adaptively-refined mesh. In this work, we present an efficient novel octree-based adaptive discretization approach capable of carving out arbitrarily shaped void regions from the parent domain: an essential requirement for fluid simulations around complex objects. Carving out objects produces an $\textit{incomplete}$ octree. We develop efficient top-down and bottom-up traversal methods to perform finite element computations on $\textit{incomplete}$ octrees. We validate the framework by (a) showing appropriate convergence analysis and (b) computing the drag coefficient for flow past a sphere for a wide range of Reynolds numbers ($\mathcal{O}(1-10^6)$) encompassing the drag crisis regime. Finally, we deploy the framework on a realistic geometry on a current project to evaluate COVID-19 transmission risk in classrooms.

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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