当前位置: X-MOL 学术Math. Comput. Model. Dyn. Syst. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Smoothed particle hydrodynamics and modal reduction for efficient fluid–structure interaction
Mathematical and Computer Modelling of Dynamical Systems ( IF 1.9 ) Pub Date : 2018-07-04 , DOI: 10.1080/13873954.2018.1488739
Markus Schörgenhumer 1 , Alexander Humer 2
Affiliation  

ABSTRACT From wind turbines to capillary blood flow, problems of fluid–structure interaction occur across different scales of length and time. Owed to the multiple scales involved, the inherent complexity of coupled fluid and structural dynamics requires advanced numerical methods for the computational analysis. The proposed method relies on the coupling of modally reduced flexible multibody systems with fluids represented by the smoothed particle hydrodynamics method. A reduced-order basis is employed to describe small flexible deformation of a structural component relative to its large rigid body motion that is represented by a body-fixed frame. An efficient evaluation of the surface deformation of the bodies involved is a vital ingredient for the coupling. Conventional approaches suffer from the drawback of flexible deformation being represented in a body-fixed local frame. The generalized component mode synthesis, in which the total displacement is interpolated, mitigates this computational limitation. The linear relation between generalized coordinates and the total displacement allows the coupling forces to be evaluated within the parallel fluid framework. Only the reduced set of equations of motion is solved on the solid side using an implicit time integration scheme with possibly large time-steps, whereas the particle-based fluid simulation relies on a fast explicit scheme.

中文翻译:

平滑粒子流体动力学和模态简化,以实现高效的流固耦合

摘要 从风力涡轮机到毛细血管血流,流固耦合问题发生在不同的长度和时间尺度上。由于涉及多个尺度,耦合流体和结构动力学的固有复杂性需要先进的数值方法进行计算分析。所提出的方法依赖于模态简化柔性多体系统与光滑粒子流体动力学方法所代表的流体的耦合。降阶基础用于描述结构部件相对于其由车身固定框架表示的大刚体运动的小柔性变形。对相关物体表面变形的有效评估是耦合的重要组成部分。传统方法的缺点是在身体固定的局部框架中表示柔性变形。对总位移进行插值的广义分量模式合成减轻了这种计算限制。广义坐标和总位移之间的线性关系允许在平行流体框架内评估耦合力。仅使用具有可能大时间步长的隐式时间积分方案在固体侧求解简化的运动方程组,而基于粒子的流体模拟依赖于快速显式方案。广义坐标和总位移之间的线性关系允许在平行流体框架内评估耦合力。仅使用具有可能大时间步长的隐式时间积分方案在固体侧求解简化的运动方程组,而基于粒子的流体模拟依赖于快速显式方案。广义坐标和总位移之间的线性关系允许在平行流体框架内评估耦合力。仅使用具有可能大时间步长的隐式时间积分方案在固体侧求解简化的运动方程组,而基于粒子的流体模拟依赖于快速显式方案。
更新日期:2018-07-04
down
wechat
bug