Towards a Fluid-Structure Interaction solver for Problems with Large Deformations within the Open-Source SU2 Suite
Towards a Fluid-Structure Interaction solver for Problems with Large Deformations within the Open-Source SU2 Suite
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DOI：
10.2514/6.2016-0205
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发表时间：
2016-01
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影响因子：
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通讯作者：
R. Sánchez;R. Palacios;T. Economon;H. Kline;J. Alonso;F. Palacios
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作者：
R. Sánchez;R. Palacios;T. Economon;H. Kline;J. Alonso;F. Palacios
本文介绍了一种新的框架内的开源代码SU2的流固耦合（FSI）建模。SU2已开发用于解决偏微分方程（PDE）描述的复杂多物理问题，重点是涉及气动外形优化的问题。由于其模块化，代码提供了一个适当的基础设施，在几个学科的物理问题的解决方案。这项工作为SU2提供了新的工具，扩展了其在结构分析和FSI领域的能力。重点将放在几何非线性变形固体在低速外部流。一个有限元（FE）结构求解器，能够处理几何和材料的非线性在静态和动态设置，已建成的框架内的SU2旁边现有的求解器。在原有的面向对象的C++架构，一个新的结构，符合CFD求解器已经开发。这些新的功能将作为未来发展的FE为基础的战略，为解决偏微分方程。结构解算器已与SU2中的原始流体解算器使用分区方法耦合。代码的结构被完全改写，以允许跨多个区域和物理问题进行分析，目前仅限于涉及流体和结构分析的问题。松耦合和强耦合两种策略均可用于求解耦合流固耦合问题。最后，通过研究低雷诺数下刚性正方形与柔性悬臂梁的行为来评估实现的有效性。所获得的结果证明了这些新发展的能力，并进一步解决了这个基准问题背后的物理。
This paper describes a new framework for Fluid-Structure Interaction (FSI) modelling within the open-source code SU2. SU2 has been developed to solve complex, multi-physics problems described by Partial Differential Equations (PDEs), with an emphasis on problems involving aerodynamic shape optimization. Due to its modularity, the code provides an appropriate infrastructure for the solution of physical problems in several disciplines. This work provides SU2 with new tools that expand its capabilities in the fields of structural analysis and FSI. The focus will be on geometrically-nonlinear deformable solids in low-speed external flows. A Finite Element (FE) structural solver, able to deal with geometrical and material non-linearities in a static and a dynamic setting, has been built within the framework of SU2 alongside the existing solvers. Following the original object-oriented architecture in C++, a new structure compliant with the CFD solver has been developed. These new features will serve as a basis for future developments of FE-based strategies for the solution of PDEs. The structural solver has been coupled with the original fluid solver in SU2 using a partitioned approach. The structure of the code was fully recast to allow analysis across multiple zones and physical problems, currently limited to problems involving fluid and structural analysis. Both looselyand strongly-coupled strategies are available for the solution of the coupled FSI problem. Finally, the validity of the implementations is assessed by studying the behavior of a rigid square with a flexible cantilever at low Reynolds number. The results obtained demonstrate the capabilities of these new developments and further address the physics behind this benchmark problem.