Robustness and efficiency aspects for computational fluid structure interaction
Robustness and efficiency aspects for computational fluid structure interaction
复制标题
计算流体结构相互作用的鲁棒性和效率
DOI：
10.1007/3-540-31768-6_9
复制
发表时间：
2006
影响因子：
2.8
通讯作者：
E. Ramm
中科院分区：
文献类型：
--
作者：
M. Neumann;Sunil R. Tiyyagura;W. Wall;E. Ramm
对于大规模 CFD 和流固耦合 (FSI) 问题的数值模拟，算法的效率和鲁棒性是两个关键要求。在本文中，我们想描述一个非常简单的概念，以显着提高向量计算机上任意非结构化有限元网格的元素计算性能。通过将计算上相似的元素分组在一起，可以控制最内层循环的长度和向量长度。此外，还将研究不同编程语言和不同阵列管理技术的效果。 CFD 数值模拟将显示矢量计算机以及其他架构上整体求解时间的改进。特别是对于 FSI 模拟，算法的稳健性也非常重要。对于不可压缩粘性流和非线性柔性结构的瞬态相互作用，常用的顺序交错耦合方案表现出弱不稳定性。作为解决此问题的最佳方法，应调用迭代来保证整个流体-结构界面的运动学和动态连续性。为了确保这些迭代子结构方案的效率，提出了两种鲁棒且与问题无关的加速方法。
For the numerical simulation of large scale CFD and fluid-structure interaction (FSI) problems efficiency and robustness of the algorithms are two key requirements. In this paper we would like to describe a very simple concept to increase significantly the performance of the element calculation of an arbitrary unstructured finite element mesh on vector computers. By grouping computationally similar elements together the length of the innermost loops and the vector length can be controlled. In addition the effect of different programming languages and different array management techniques will be investigated. A numerical CFD simulation will show the improvement in the overall time-to-solution on vector computers as well as on other architectures. Especially for FSI simulations also the robustness of the algorithm is very important. For the transient interaction of incompressible viscous flows and nonlinear flexible structures commonly used sequential staggered coupling schemes exhibit weak instabilities. As best remedy to this problem subiterations should be invoked to guarantee kinematic and dynamic continuity across the fluid-structure interface. To ensure the efficiency of these iterative substructuring schemes two robust and problem-independent acceleration methods are proposed.