A fast and robust hybrid method for block‐structured mesh deformation with emphasis on FSI‐LES applications
A fast and robust hybrid method for block‐structured mesh deformation with emphasis on FSI‐LES applications
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DOI：
10.1002/nme.5465
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发表时间：
2017-07
影响因子：
2.9
通讯作者：
Shuvam Sen;G. De Nayer;M. Breuer
中科院分区：
文献类型：
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作者：
Shuvam Sen;G. De Nayer;M. Breuer
本文介绍了一种基于大涡模拟（LES）的流固耦合（FSI）问题模拟中块结构网格变形的有效方法。所提出的混合方法结合了逆距离加权（IDW）插值与超限插值（TFI）的简单性和低计算量的优点，同时保持边界层的网格质量。这是对目前使用的最先进技术的改进。为了达到这一目标，在第一步中，三个基本的网格变形方法（TFI，IDW和径向基函数）进行了研究的基础上，几个不同的复杂性的测试情况下，不仅分析他们的能力，而且他们的计算成本。这不仅可以指出每种方法的优点，而且还可以说明它们的缺点。基于不同方法的这些特定属性，建议采用一种混合方法，将整个网格变形分为两个步骤：首先，块结构网格的块边界的移动，其次，网格每个块的变形。这两个步骤都依赖于不同的方法，这使得可以为每个步骤制定出最合适的方法，从而在所实现的网格质量和所需的计算工作量之间实现合理的折衷。最后，一个混合IDW-TFI方法建议，最适合耦合FSI-LES应用程序的特定要求。然后将该混合程序应用于真实的FSI-LES案例。版权所有© 2016约翰威利父子有限公司.
The present work introduces an efficient technique for the deformation of block‐structured grids occurring in simulations of fluid–structure interaction (FSI) problems relying on large‐eddy simulation (LES). The proposed hybrid approach combines the advantages of the inverse distance weighting (IDW) interpolation with the simplicity and low computational effort of transfinite interpolation (TFI), while preserving the mesh quality in boundary layers. It is an improvement over the state‐of‐the‐art currently in use. To reach this objective, in a first step, three elementary mesh deformation methods (TFI, IDW, and radial basis functions) are investigated based on several test cases of different complexities analyzing not only their capabilities but also their computational costs. That not only allows to point out the advantages of each method but also demonstrates their drawbacks. Based on these specific properties of the different methods, a hybrid methodology is suggested that splits the entire grid deformation into two steps: first, the movement of the block‐boundaries of the block‐structured grid and second, the deformation of each block of the grid. Both steps rely on different methodologies, which allows to work out the most appropriate method for each step leading to a reasonable compromise between the grid quality achieved and the computational effort required. Finally, a hybrid IDW‐TFI methodology is suggested that best fits to the specific requirements of coupled FSI‐LES applications. This hybrid procedure is then applied to a real‐life FSI‐LES case. Copyright © 2016 John Wiley & Sons, Ltd.