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颗粒流的动力学模型和实验研究进展 总被引:14,自引:3,他引:14
首先叙述了颗粒流研究的背景和基本概念,接着概述了颗粒流动力学研究的三种基本数学力学模型:颗粒动理论(kinetic theory)模型、摩擦塑性模型和离散元模拟模型.介绍了它们的基本原理,并分析了各个模型的优缺点和适用范围.随之,对颗粒流的实验研究情况作了简要的介绍,列举了研究中几种常用的试验方法和观测手段,以及观测到的一些典型现象.最后,我们简述了颗粒流研究的主要困难,并提出了某些有待解决的研究课题. 相似文献
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两种高分辨率数值方法计算波前有非均匀流的变截面管内激波传播规律的比较 总被引:1,自引:0,他引:1
本文采用两种对间断解具有高分辨率的数值方法基于推广Riemann问题解的二阶Godunov型有限差分法和分裂算子的随机选取法,计算了微波在波前有非均匀定常流的一维变截面管道中的传播和波后流场特征,得到一致结果,用数值模拟方法揭示了这类运动的一些特殊规律。对比两种方法的计算过程和结果,可以看出,二阶Godunov型方法明显优于随机选取法。 相似文献
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吴清松 《应用数学和力学(英文版)》1989,(10)
In this paper,on the basis of experimental data of two kinds of chemical explosions,the piston-pushing model of spherical blast-waves and the second-order Godunov-type scheme of finite difference methods with high identification to discontinuity are used to the numerical reconstruction of part of an actual hemispherical blast-wave flow field by properly adjusting the moving bounary conditions of a piston.This method is simple and reliable.It is suitable to the evaluation of effects of the blast-wave flow field away from the explosion center. 相似文献
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This paper studies the force network properties of marginally and deeply jammed packings of frictionless soft particlesfrom the perspective of complex network theory. We generate zero-temperature granular packings at different pressures by minimizing the inter-particle potential energy. The force networks are constructed as nodes representing particles and links representing normal forces between the particles. Deeply jammed solids show remarkably different behavior from marginally jammed solids in their degree distribution, strength distribution, degree correlation, and clustering coefficient. Bimodal and multi-modal distributions emerge when the system enters the deep jamming region. The results also show that small and large particles can show different correlation behavior in this simple system. 相似文献
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In this paper, we carry out an analysis of the structural properties of the solutions to the speed gradient (SG) traffic flow
model. Under the condition that the relaxation effect can be neglected, it is shown that a 1-shock or a 1-rarefaction is associated
with the first characteristic, but on the other hand, a contact discontinuity rather than a 2-shock or a 2-rarefaction is
associated with the second characteristic. Since the existence of a 2-shock or 2-rarefaction violates the physical mechanism
of the traffic flow, the SG model is more reasonable. If the relaxation effect cannot be neglected, it is somewhat difficult
to carry out the analytical analysis and the numerical simulation results should be obtained.
The project supported by the National Natural Science Foundation of China (10272101) 相似文献
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IntroductionRecentlytheauthorspresentedanewdynamicsmodelfortrafficflow[1].Themodelcomprisesacontinuumequationandadynamicsequation k/ t+ (ku) / x=0 ,( 1 ) u t+u u x=ue(k) -uT +a u x,( 2 )wherekistrafficdensity ;uismeanspeed ;x ,tarespaceandtimecoordinatesrespectively .Tisrel… 相似文献
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A bidisperse granular mixture in a slightly tilted compartmentalized chamber is experimentally found to show size segregation when vertically vibrated.A surface slope develops and large particles congregate to the lower side.Particles right upon the upper tip of the dividing wall behave in a competitive way,i.e.,they can go to either compartment depending on the force exerted on them. 相似文献
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