Simulations for the explosion and granular impact problems using the SPH method

smoothed particle hydrodynamics;parallel programming;landmine detonations;underwater explosions;granular impacts

Chen, Jianyuaffiliation1:Faculty of Engineering ; advisor:Fue-Sang, Lien ; Fue-Sang, Lien ;

University of Waterloo

关键词: underwater explosions;    landmine detonations;    smoothed particle hydrodynamics;    granular impacts;    Doctoral Thesis;    parallel programming;   

Others  :  https://uwspace.uwaterloo.ca/bitstream/10012/14844/1/Chen_Jianyu.pdf

瑞士|英语

来源: UWSPACE Waterloo Institutional Repository

【 摘 要 】

Simulations of explosions and granular impacts are challenging tasks to tackle usingconventional mesh-based methods. In this thesis, a mesh-free technique called smoothedparticle hydrodynamics (SPH) in conjunction with the Open-MP and CUDA parallel pro-gramming interfaces is introduced to tackle three-dimensional (3D) problems with largedeformations.Chapter 1 gives an introduction of the SPH method and a literature review of the the-oretical improvement of SPH, landmine detonations, underwater explosions, and granularimpacts. A research outline of the thesis is also presented at the end of this chapter. Thebasic ideas of the SPH method and some techniques which are relevant to improve theaccuracy and stability of SPH, including the artificial viscosity, artificial stress, boundaryimplementation, neighboring particles search, and kernel gradient correction, are describedin Chapter 2. In order to solve the governing equations, an elaboration of the constitutivemodels to update the stress tensor of soil and solid and the equation of states (EOSs) isgiven in Chapter 3.The simulations of the detonation and granular impact problems using the SPH methodare thoroughly presented in chapters 4-7. In Chapter 4, in order to tackle 3D problemswith large number of particles, the in-house SPH code is parallelized by the Open-MPprogramming interface. The parallel efficiency is tested by the 3D shaped charge detonation.The simulations of the 2D soil explosion and its effects on structures are investigated inChapter 5. Based on the parallelization of the SPH code and the simulation of 2D soilexplosion, the physical process of the 3D landmine detonation is studied further. Thesimulations of the 3D underwater explosion within cylindrical rigid and aluminium (Al)tubes including cavitation phenomenon are presented in Chapter 6. The simulations of the3D granular impacts using GPU acceleration are presented in Chapter 7. The numericalresults of SPH are compared against the experimental and other available numerical data, andit is shown that the SPH method is capable of predicting landmine detonations, underwaterexplosions, and granular impacts.The conclusions, novelties, and future plan of SPH research are summarized in Chapter8.