基于ANCF和SPH的柔性降落伞流固耦合动力学仿真
Fluid-solid coupled dynamic simulations of flexible parachute based on ANCF and SPH
李庆军 1鲁媛媛 2徐方暖 3王博3
作者信息
- 1. 中山大学 航空航天学院,深圳 518107
- 2. 北京空间机电研究所,北京 100094
- 3. 西北工业大学 工程力学系,西安 710072;西北工业大学 深圳研究院,深圳 518057
- 折叠
摘要
针对降落伞在展开后下降过程中,降落伞与空气流场之间的柔性结构流固耦合动力学问题,鉴于绝对节点坐标方法(ANCF)在描述柔性结构大变形问题时,克服了传统有限元建模方法带来的弹性变形与刚性变形强耦合问题,本文基于ANCF建立柔性伞绳和伞衣的力学模型.同时,考虑到光滑粒子流方法(SPH)在流场极大变形时,能够自然地捕获快速移动的界面和自由表面,本文采用SPH模拟空气流场,通过弹簧-阻尼模型描述流体粒子和柔性结构之间的耦合效应,对大柔性降落伞进行流固耦合动力学仿真研究.通过数值试验发现:随着流场速度的增大,降落伞有效面积平均值虽然只出现小幅下降,但随时间变化的幅度显著增加.本文研究结果将为柔性降落伞设计提供理论支撑.
Abstract
For the dynamic problem of the coupled fluid-structure between the parachute and air flow,and compared with the classic method,the Absolute Nodal Coordinate Formulation(ANCF)can overcome the strong coupling prob-lem of elastic deformation and rigid deformation.In this paper,the method of ANCF is used to build up a mechanical model of flexible parachute rope and canopy.In addition,as the method of Smoothed Particle Hydrodynamics(SPH)can capture the fast-moving interface and free surface when the flow field is greatly deformed,SPH is adopted to simu-late the air flow field.The coupling effect between fluid particles and flexible structures is described through the spring-damping model.Fluid-structure coupling dynamics is then conducted to investigate the dynamic behaviours of the flex-ible parachute.Through the numerical examples,it is found that with the increase of the speed of the fluid,the effec-tive projected area of the parachute is decreased slightly,whereas the variation amplitude of the effective projected area is increased significantly.The findings of this paper are useful for the design of flexible parachutes.
关键词
降落伞/流固耦合/绝对节点坐标方法/光滑粒子流方法/动力学Key words
parachute/fluid-structure coupling/absolute node coordinate formulation/smoothed particle hydrody-namics/dynamic引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据