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arXiv 2201.09546math.NAcs.NA
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浅水双曲型方程的嵌入域缩减基模型及其移动边界法

Embedded domain Reduced Basis Models for the shallow water hyperbolic equations with the Shifted Boundary Method

Xianyi Zeng, Giovanni Stabile, Efthymios N. Karatzas, Guglielmo Scovazzi, Gianluigi Rozza

摘要:

本文考虑了浅水双曲问题的全离散嵌入有限元逼近及其降阶模型。我们的方法是基于一个固定的背景网格和嵌入式减少的基础上。空间离散的移动边界方法与显式预测/多校正时间积分相结合,在时间上集成的数值解的浅水方程,无论是全阶和降阶模式。为了改善解流形的近似,也为在离线阶段期间未测试的几何形状,快照已经通过在减少的基础计算之前的插值程序进行了预处理。几何参数化的形状与不同的大小和位置的方法进行了测试。

英文摘要:

We consider fully discrete embedded finite element approximations for a shallow water hyperbolic problem and its reduced-order model. Our approach is based on a fixed background mesh and an embedded reduced basis. The Shifted Boundary Method for spatial discretization is combined with an explicit predictor/multi-corrector time integration to integrate in time the numerical solutions to the shallow water equations, both for the full and reduced-order model. In order to improve the approximation of the solution manifold also for geometries that are untested during the offline stage, the snapshots have been pre-processed by means of an interpolation procedure that precedes the reduced basis computation. The methodology is tested on geometrically parametrized shapes with varying size and position.

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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