Abstract
There have been few experimental and numerical studies on damping effects in fluid-structure interaction (FSI) problems. Therefore, a comprehensive experimental study was conducted to investigate such effects. In experiments, a water column in a container was released and hit a rubber plate. It continued its motion until hitting a downstream wall where pressure transducers had been placed. The experiments were repeated using rubber plates with different thickness and material properties. Free-surface profiles, displacements of the rubber plates, and pressures were recorded. In addition, a numerical model was developed to simulate the violent interaction between the fluid and the elastic structure. Smoothed particle hydrodynamics (SPH) and finite element method (FEM) were used to model the fluid and the structure. Contact mechanics was used to model the coupling mechanism. The obtained numerical results were in agreement with the experimental data. We found that damping is a less important parameter in the FSI problem considered.
摘要
目的
1. 通过全面的实验研究考察阻尼在流固耦合(FSI)问题中的影响作用;2. 提出一套光滑粒子流体动力学(SPH)和有限元方法(FEM)相结合的耦合算法,并对流固耦合系统进行数值模拟。
创新点
1. 通过一系列实验研究惯性驱动问题中阻尼的影响并使用本文提出的数值方法进行验证;2. 该数值方法能够在不解耦的情况下对完整系统进行求解。
方法
1. 构建数值模型模拟流体和弹性结构之间的强烈相互作用;2. 利用SPH 和FEM对流体和结构分别进行模型化;3. 采用接触力学对系统中的流固耦合机理进行建模。
结论
1. 基于SPH-FEM 耦合的FSI 模型可成功模拟自由液面形状、橡胶板的位移以及容器壁上的压强;2. 模拟结果显示,在连续相互作用的惯性驱动问题中阻尼并不是必要的考虑因素。
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Demir, A., Dincer, A.E., Bozkus, Z. et al. Numerical and experimental investigation of damping in a dam-break problem with fluid-structure interaction. J. Zhejiang Univ. Sci. A 20, 258–271 (2019). https://doi.org/10.1631/jzus.A1800520
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DOI: https://doi.org/10.1631/jzus.A1800520
Key words
- Damping
- Fluid-structure interaction (FSI)
- Smoothed particle hydrodynamics (SPH)
- Contact mechanics
- Dam-break