基于LS-DYNA的SPH-FEM火箭橇垂直水戽斗流固耦合仿真研究

张宁; 董龙雷; 吕水燕; 刘洋; 付良

doi:10.7643/ issn.1672-9242.2025.11.001

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装备环境工程 ›› 2025, Vol. 22 ›› Issue (11) : 1-9. DOI: 10.7643/ issn.1672-9242.2025.11.001

武器装备

基于LS-DYNA的SPH-FEM火箭橇垂直水戽斗流固耦合仿真研究

张宁^1,2, 董龙雷¹, 吕水燕², 刘洋², 付良²

作者信息 +

SPH-FEM Coupled Fluid-structure Interaction Simulation of Vertical Water Brake in Rocket Sled via LS-DYNA

ZHANG Ning^1,2, DONG Longlei¹, LYU Shuiyan², LIU Yang², FU Liang²

Author information +

文章历史 +

摘要

目的更准确地得出火箭橇垂直水戽斗在超音速条件下,对不同水层的完整刹车过程的力学响应特性。方法采用HyperMesh划分高质量的有限元网格,基于LS-DYNA,采用FEM模拟垂直水戽斗的有限元模型,采用无网格的SPH粒子模拟长柱形水域粒子在刹车时的飞散过程,对火箭橇垂直水戽斗与水层之间的交互行为进行数值模拟仿真,得出垂直水戽斗在运动过程中的最大应力点,以及应力变化的全过程时域响应和不同工况下戽斗刹车力的理论-仿真误差特性,并结合火箭橇垂直水戽斗刹车试验数据结果,验证不同工况下戽斗刹车力的仿实误差特性的结果。结果通过数据分析可以发现,仿真结果的平均误差和最大误差分别为6%和10%。结论结合理论推导、模拟仿真与试验测试,验证了基于LS-DYNA的SPH-FEM流固耦合的数值模拟方法能有效预测火箭橇垂直水戽斗完整刹车过程中的力学响应。

Abstract

The work aims to accurately simulate the mechanical response characteristics of a vertical water brake under supersonic conditions during the complete deceleration process across different water layers. HyperMesh was used to generate high-quality finite element meshes and FEM in LS-DYNA was employed to model the vertical water brake structure, while the meshless SPH method was adopted to simulate the splashing dynamics of the cylindrical water column during braking. Through this coupled SPH-FEM numerical approach, the FSI between the vertical water brake and the water layer was analyzed, including the maximum stress points of the water brake during motion, time-domain responses of stress variations throughout the process and theoretical-simulation error characteristics of braking force under different working conditions. Experimental data from rocket sled tests were further used to validate the simulated braking force errors across scenarios. Data analysis revealed that the average error and maximum error of the simulation results were 6% and 10% respectively, leading to a conclusion with clear engineering guiding value. By combining theoretical derivation, simulation, and experimental testing, the effectiveness of the SPH-FEM fluid-structure interaction numerical simulation method based on LS-DYNA in predicting the mechanical response during the complete braking process of the vertical water brake for rocket sleds is verified.

导出引用

张宁, 董龙雷, 吕水燕, 刘洋, 付良. 基于LS-DYNA的SPH-FEM火箭橇垂直水戽斗流固耦合仿真研究[J]. 装备环境工程. 2025, 22(11): 1-9 https://doi.org/10.7643/ issn.1672-9242.2025.11.001

ZHANG Ning, DONG Longlei, LYU Shuiyan, LIU Yang, FU Liang. SPH-FEM Coupled Fluid-structure Interaction Simulation of Vertical Water Brake in Rocket Sled via LS-DYNA[J]. Equipment Environmental Engineering. 2025, 22(11): 1-9 https://doi.org/10.7643/ issn.1672-9242.2025.11.001

中图分类号： TJ03

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