结构物入水冲击动力学问题的DSPH计算方法和试验研究

项目名称： 结构物入水冲击动力学问题的DSPH计算方法和试验研究

项目编号： No.11272266

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 徐绯

作者单位： 西北工业大学

项目金额： 78万元

中文摘要： 本文以大型飞机水上迫降、航天飞行器水上回收等重大工程问题为研究背景，拟建立一套较完整的以DSPH计算为主、试验为辅的分析方法，研究结构物入水的冲击动力学响应规律，并给出冲击过程中结构物减速、入水砰击力、结构物表面压力分布等力学参数，为结构物入水的安全性评估提供理论与技术支撑。拟开展三方面的研究工作：（1）在课题组针对弹靶侵彻问题中固/固不连续界面的DSPH方法研究和自编分析软件的基础上，将其推广应用到流固耦合界面问题，着力提高计算的精度和稳定性；（2）建立结构物入水试验测试系统，开展楔形体入水的试验研究，验证算法及其软件的有效性；（3）开展不同尺寸缩比模型入水冲击动响应规律的数值计算研究，结合模型入水试验，探索壳体结构入水冲击动力学缩比模型的相似性问题。

中文关键词： DSPH算法；FPM算法；入水试验；流固耦合；并行计算

英文摘要： This proposal comes from the complex event of crash landings on water in modern aerospace vehicles. The objective of this project is to setup a platform to evaluate the crashworthy concepts prior to expensive testing programs, and the global research focus is on developing efficient simulation tools, particularly using the DSPH (Discontinuous Smoothing Particle Hydrodynamic) method. Through numerical modelling with experimental testing, a better understanding of the dynamics behavior of the event can be gained and thus lead to the development of efficient computational tools. The aim of the computational tool is to extend our self-developed discontinous SPH （DSPH）codes to describe the fluid-structure interaction,which has been previously applied in presenting the interfaces between two solid materials under imapct loading. The numerical accuracy and the stability for DSPH method in sloving the fluid solid coupling interface would be the main issues. The effect of the DSPH code on simulating the dynamic response of rigid wedges will be validated by the corresponding water entry tests. Then several scaled models of a typical shell structure will be investigated by the DSPH computational tool to analysis the dynamic similarities among them. Experiments will be conducted on the rigid wedges and different scaled

英文关键词： DSPH；FPM；water entry experiment；FSI；parallel computing