搜索结果: 1-15 共查到“SPH”相关记录49条 . 查询时间(0.048 秒)
为研究鱼雷等近场水下爆炸时舰船防护液舱抗高速弹片侵彻的性能特性，基于SPH法构建高速弹片侵彻液舱数值模型，通过改变液舱宽度、外板厚度、有无液舱外板和弹片入射角度4个变量，分析弹片速度和冲击波压力的衰减效应。结果表明，液舱宽度和外板厚度的变化对弹片速度的衰减影响较小，但对冲击波压力的峰值和响应时间影响较大，而液舱外板和弹片入射角度对二者的影响都较大。
利用光滑粒子流体动力方法及有限单元法对弹丸侵彻土壤回收箱的过程进行了数值模拟，对弹丸在土壤中的弹道以及土壤受撞击后的运动和变形进行了分析，将侵彻深度与Young公式计算结果进行了比较，分析了误差产生的原因。结果表明：利用光滑粒子流体动力方法可以较好的模拟土壤受弹丸冲击过程土壤颗粒飞溅和变形的过程；弹丸在不同速度下的侵彻深度与Young公式计算结果较为接近；弹丸极低速度下仿真结果偏差较大；回收箱撞击...
利用光滑质点水动力学法(SPH方法)对正弦形消力池底板上的水跃现象进行数值建模，共模拟2种波形5种工况。将SPH方法的模拟值与已有文献的试验值作对比，验证数值模型及数值方法研究此类问题的可行性和适用性，并分析水面线、流速分布、跃长、共轭水深、消能率等水跃特性的变化规律。结果表明:SPH方法模拟结果与试验结果吻合度较高；水跃段流速分布不均匀、自由表面波动较大，且流层间存在相对运动从而形成旋滚，同等条...
基于自编SPH程序，模拟了球形弹丸超高速撞击薄板。将模拟结果与实验X照片、弹丸变形后的轴向径向尺寸等数据进行对比，定量研究了不同靶板厚度时弹丸内部应力波分布。结果表明，模拟结果与实验数据基本吻合。相同弹丸速度时，靶板越薄弹丸内部冲击波越容易被卸载，速度较低的弹丸后半部分未出现明显塑性变形。弹丸内部冲击波在弹丸后表面反射形成的拉伸波与冲击波相互作用，弹丸后半部分材料剥落，弹丸速度较大时甚至会使剩下的...
SPATIO-TEMPORAL PROCESS SIMULATION OF DAM-BREAK FLOOD BASED ON SPH
Smooth Particle Hydrodynamics GIS Dam-break Flood Spatio-temporal Process Simulation
2018/5/15
On the basis of introducing the SPH (Smooth Particle Hydrodynamics) simulation method, the key research problems were given solutions in this paper, which ere the spatial scale and temporal scale adap...
基于三维FEM-SPH转换算法的截齿冲击结核体仿真分析
结核体 FEM-SPH转换算法 剥落机理 数值仿真
2018/4/23
采用基于转换算法的FEM-SPH耦合方法，通过建立截齿冲击煤层及其内部结核体的三维模型，分析了截齿冲击位置对截齿载荷的影响，探讨了结核体尺寸与截齿载荷极值的关系，最后研究了结核体剥落的机理，结果表明:结核体尺寸和截齿冲击点是决定结核体剥落机理的主要因素，可以将其划分为旋转、压入、松动、截断、切削5种，且剥落载荷极值的大小顺序为截断>切削>压入>旋转>松动;当结核体几何中心点处于截齿截道上时，截齿的...
基于SPH-FEM耦合算法的埋地输气管道近场爆炸冲击动力响应
SPH-FEM耦合算法 输气管道 土中爆炸 动力学响应 数值模拟
2018/4/23
利用ANSYS/LS-DYNA和LS-PREPOST前后处理模块，建立基于光滑粒子流体力学-有限单元法（SPH-FEM）耦合的土中爆炸模型。结果表明，土中爆炸波峰值压力随比例爆距的衰减规律与经验曲线基本一致，且瞬时爆腔尺寸也和相关经验描述吻合较好，从而验证了方法的可行性与准确性。针对X80大口径高压输气管线在土中近场爆炸的冲击响应过程，建立管-土-炸药耦合模型，分析起爆后不同时刻爆腔形状的演变过程...
Password-based authenticated key exchange (PAKE) enables two users with shared low-entropy passwords to establish cryptographically strong session keys over insecure networks. At Asiacrypt 2009, Katz ...
Size–frequency distributions of fragments from SPH/N-body simulations of asteroid impacts: Comparison with observed asteroid families
Asteroids Collisional physics Impact processes
2015/12/25
We investigate the morphology of size–frequency distributions (SFDs) resulting from impacts into 100-km-diameter parent asteroids, represented by a suite of 161 SPH/N-body simulations conducted to stu...
Numerical simulation of lava flow using a GPU SPH model
GPGPU modeling HPC SPH hazard lava
2015/8/27
A smoothed particle hydrodynamics (SPH) method for lava-flow modeling was implemented on a graphical processing unit (GPU) using the compute unified device architecture (CUDA) developed by NVIDIA. Thi...
该文采用自编程序实现的FE-SPH 自适应耦合算法对长杆弹侵彻反应装甲的过程开展了数值模拟研究。为了实现反应装甲中的凝聚炸药在长杆弹冲击作用下的起爆过程,在FE-SPH 自适应耦合算法中嵌入了凝聚炸药的点火-增长模型。该文首先应用FE-SPH 自适应耦合算法对二维轴对称反应装甲冲击起爆模型进行了模拟分析,并以此验证了自适应FE-SPH 自适应耦合算法对此类问题模拟的可行性和有效性。其次,针对长杆弹...
Galaxy merger statistics and inferred bulge-to-disk ratios in cosmological SPH simulations
formation spiral elliptical
2014/12/24
We construct merger trees for galaxies identified in a cosmological hydrodynamic simulation and use them to characterize predicted merger rates as a function of redshift, galaxy mass, and merger mass ...
Accretion, feedback and galaxy bimodality: a comparison of the GalICS semi-analytic model and cosmological SPH simulations
cooling fl ows evolution
2014/12/23
We compare the galaxy population of a smoothed particle hydrodynamics (SPH) simulation to those predicted by the GalICS (Galaxies In Cosmological Simulations) N-body + semi-analytic model and a stripp...
Growth of galaxies in SPH simulations
Explore Galaxy formation. Smooth particle hydrodynamics The universe simulation Galactic gas Temperature history Galaxy star
2014/12/9
We explore the growth of galaxies formed in self-consistent Smoothed Particle Hydrodynamic (SPH) cosmological simulations. In the first Chapter, we examine the temperature history of gas accreted by f...
Efficient implementation of smo othed particle hydro dynamics (SPH) with plane sweep algorithm
Smoothed particle hydrodynamics Meshfree method Neighbour search Plane sweep algorithm Morton code Segment tree Quadtree Parallelization Dam break
2014/10/10
Neighbour search (NS) is the core of any implementations of smoothed particle hydrodynamics (SPH). In this paper, we present an efficient O( N log N) neighbour search method based on the plane sweep (...