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1.
设计了基于液氮的低温冷冻治疗系统,并进行动物组织实验研究,得到组织关键测温点的温度变化;并对冷冻过程进行数值模拟,将实验结果与模拟冷冻结果进行对比,根据二者的差异对数值模拟中采用的组织热物性参数进行修正,使模拟结果更接近于实际冷冻过程.  相似文献   

2.
本文以阿尔法磁谱仪中的配电系统为研究对象,阐述了利用热管解决配电系统局部温度过高的热控问题。通过数值模拟,采用体点散热问题的仿生优化方法,获得了高导热性的热管在母板中的人工构造,构建了一种有效的热控系统。数值模拟和实验结果对比验证了数值模拟模型的可靠性和仿生优化方法的可行性,也说明了热管在均温和传热方面的优良作用。  相似文献   

3.
螺旋线型微秒级高压长脉冲产生器数值模拟   总被引:1,自引:1,他引:0       下载免费PDF全文
 探索了采用CST软件和PSpice软件进行加速器场分布数值模拟的方法,利用该方法可方便地获取设备内部动态场分布图及动态电压变化规律。针对螺旋线型μs级高压长脉冲产生器系统建立了数值模拟模型,给出了详细的模拟步骤及结果。分析表明,利用场分布模拟方法获取的电压变化规律与电路模拟方法获取的结果是一致的。基于CST模拟方法,可以给出螺旋线及主开关等电气结构的瞬态电场分布,场强增强点主要出现在螺旋带的外沿及金属电极连接处,在介质支撑内部也有较高的场强分布。  相似文献   

4.
对同轴法射线相衬成像进行数值模拟计算,可用于特定对象检测方法的可行性分析或检测参数优化。为此,分析了同轴法射线相衬成像系统数值模拟计算的原理及其实现方法,并针对圆形物体、长条形物体进行了相衬成像实验的数值模拟计算。对照计算结果进行分析可知:对物体平面进行离散化的尺寸很大程度上影响到数值模拟计算结果的准确程度,究其原因在于对物体平面进行离散化时决定了成像系统光学传递函数离散化的准确程度;为保证数值模拟结果的准确性,应使数值计算中光学传递函数取值点连续、不存在明显的失真;保证数值模拟结果准确所需的光学传递函数的离散化尺寸不是固定的,而是应与检测对象的大小相匹配。  相似文献   

5.
赵振华  张胜海  杨华  谭建峰  张丹 《光子学报》2014,40(10):1459-1463
从理论上分析了电光双稳态系统的稳定性,通过图解方式研究了各不动点的稳定性.用数值求解的方法,确定了分岔点的具体位置,分析了该系统是经过倍周期分岔和阵发混沌途径产生混沌.数值模拟由系统状态随参量变化的分岔图和最大李雅普诺夫指数随参量的变化关系,表明本文的理论分析结果是完全自洽的.  相似文献   

6.
电光双稳态系统的混沌特性分析   总被引:1,自引:0,他引:1  
赵振华  张胜海  杨华  谭建峰  张丹 《光子学报》2011,(10):1464-1468
从理论上分析了电光双稳态系统的稳定性,通过图解方式研究了各不动点的稳定性.用数值求解的方法,确定了分岔点的具体位置,分析了该系统是经过倍周期分岔和阵发混沌途径产生混沌.数值模拟由系统状态随参量变化的分岔图和最大李雅普诺夫指数随参量的变化关系,表明本文的理论分析结果是完全自洽的.  相似文献   

7.
本文对安装有引射器的回路系统从强制循环到自然循环的过渡特性进行了实验研究和数值模拟,实验结果表明,在过渡过程中、当加热功率超过某一限度,系统内将发生密度波型汽液两相流动不稳定性,危及设备的安全运行。数值模拟采用汽液两相热力学非平衡模型以考虑过冷沸腾对流动不稳定性的影响,使用迭代解法求解差分方程,数值模拟结果与实验结果相当一致。  相似文献   

8.
在格点QCD的框架下,讨论了计算强子的形状因子的过程中,有限体积效应对所得结果的影响,并且给出了计算连续动量空间上形状因子数值的内插算法。本文以π介子的形状因子为例,介绍了从格点QCD中得到的三点关联函数出发计算π介子的形状因子的方法,并说明有限体积效应使得计算结果只能在分立动量上给出。本文探讨了一种保持旋转对称性的内插算法和一种对于傅立叶变换进行连续化的内插算法,基于分立的形状因子取值给出了连续动量空间上的形状因子,并且提供了模型模拟的结果与真实格点系统上的数值结果。本文提出的内插算法及数值模拟的结论不依赖于特定的格点系综,具有一定程度的普适性,能够推广到对于其他格点系统的有限体积效应的处理,同时为格点系统尺度的选取提供了有价值的参考。  相似文献   

9.
高功率LED用微喷冷却系统的分析和优化   总被引:2,自引:0,他引:2  
对一种高功率LED散热用封闭微喷射流系统开展了初步的实验测试,测试结果和简单的数学分析表明实验用微喷系统有较大的改进空间.为了改进该系统,利用数值模拟开展微喷结构优化.首先将模拟结果与实验结果进行比较,证明了该模拟模型的可行性.然后通过该数值模型对包括实验用微喷结构在内的二种结构形式的微喷系统开展了模拟分析,寻找到一种较为合理的散热系统结构形式.结果表明:采用流体单进双出的结构形式可使得射流更均匀,与现有方式相比,该冷却系统作用下的芯片最高温度可降低23 K之多.  相似文献   

10.
付海翔  曹力 《计算物理》1999,16(5):481-488
在某些条件下共同驱动随机系统的乘法噪声和加法噪声可以相互关联,相关噪声驱动的随机微分系统具有独特的性质,而数值模拟是研究这类系统一种强有力的方法。研究相关噪声驱动系统的数值模拟算法,分别就白噪声情形和色噪声情形作了讨论,得到了一种一阶数值模拟算法,并与已有文献的解析结果进行了对比。  相似文献   

11.
We describe the construction of a high performance parallel computer composed of PC components, presentsome physical results for light hadron and hybrid meson masses from lattice QCD. We also show that the smearingtechnique is very useful for improving the spectrum calculations.  相似文献   

12.
We continue our investigation of stochastic lattice gases as a (highly parallel) means of simulating given PDEs, in this case Burgers' equation in one dimension. The lattice dynamics consists of stochastic unidirectional particle displacement, and our attention is turned toward the reliability of the model, i.e., its ability to reproduce the unique physical solution of Burgers' equation. Lattice gas results are discussed and compared against finite-difference calculations and exact solutions in examples which include shocks and rarefaction waves.  相似文献   

13.
彭浩  单鸣雷  朱昌平  姚澄 《计算物理》2018,35(5):554-562
格子Boltzmann方法伪势模型算法中的格点间计算未完全局部化,因此在并行计算时需要更多次的全局内存读写、使用更多数量的寄存器和线程同步操作,从而导致GPU并行计算效率下降.本文针对伪势模型并行计算的局限性,基于三维十五速格子结构的多松弛时间伪势模型,以气液相分离为算例,通过合并访问的方式提高全局内存的读写效率;并提出一种"定向转移"算法,提高格子边界格点获取邻居格点数据的效率;最后探索不同资源分配中各种因素对计算效率的影响,总结最优资源分配的方法.  相似文献   

14.
A parallel algorithm for the enumeration of isolated connected clusters on a regular lattice is presented. The algorithm has been implemented on 17 RISC-based workstations to calculate the perimeter polynomials for the plane triangular lattice up to clustersizes=21. New data for perimeter polynomials Ds up toD 21, total number of clustersg s up tog 22, and coefficientsb r in the low-density series expansion of the mean cluster size up tob 21 are given.  相似文献   

15.
《Physics letters. A》2006,349(6):439-445
In this Letter we give a new integrable four-field lattice hierarchy, associated to a new discrete spectral problem. We obtain our hierarchy as the compatibility condition of this spectral problem and an associated equation, constructed herein, for the time-evolution of eigenfunctions. We consider reductions of our hierarchy, which also of course admit discrete zero curvature representations, in detail. We find that our hierarchy includes many well-known integrable hierarchies as special cases, including the Toda lattice hierarchy, the modified Toda lattice hierarchy, the relativistic Toda lattice hierarchy, and the Volterra lattice hierarchy. We also obtain here a new integrable two-field lattice hierarchy, to which we give the name of Suris lattice hierarchy, since the first equation of this hierarchy has previously been given by Suris. The Hamiltonian structure of the Suris lattice hierarchy is obtained by means of a trace identity formula.  相似文献   

16.
R. Ramakumar  A.N. Das 《Physica A》2011,390(2):208-213
We present a theoretical study of Bose-Einstein condensation in highly anisotropic harmonic traps. The bosons are considered to be moving in an optical lattice in an overall anisotropic harmonic confining potential. We find that two-step condensation occurs for lattice bosons at much reduced harmonic potential anisotropy when compared to the case of an ideal Bose gas in an anisotropic harmonic confinement. We also show that when the bosons are in an isotropic harmonic confinement but with highly anisotropic hopping in the optical lattice, two-step condensation does not occur. We interpret some of our results using single boson density of energy states corresponding to the potentials faced by the bosons.  相似文献   

17.
The conformal charge is an important quantity which characterizes the nature of the two-dimensional phase transition. We report a first attempt to use a new numerical method to calculate the conformal charge. In this paper, we apply our method to the 2-dimensional, 4, continuous-spin Ising model. By varying the parameters in the Hamiltonian, one can change continuously from the known Gaussian limit to the Ising limit. It is well known that the critical points for these two systems are not in the same universality class. We study this behavior for the Gaussian model, the single-well 4 model, the border model, and the double-well 4 model for a large lattice. Our results, while giving a good general picture, are not so far sufficient to differentiate whether the non-Gaussian cases studied belong to the Ising model universality class or not. Further studies of other lattice sizes should serve to improve greatly our conclusions.  相似文献   

18.
19.
The Lorentz lattice gas is studied from the perspective of computational complexity theory. It is shown that using massive parallelism, particle trajectories can be simulated in a time that scales logarithmically in the length of the trajectory. This result characterizes the logical depth of the Lorentz lattice gas and allows us to compare it to other models in statistical physics.  相似文献   

20.
B.R.A. Nijboer 《Physica A》1984,125(1):275-279
Consider N layers of a NaCl-type ionic lattice such that in every layer one has an infinite square lattice of positive and negative unit point charges. We present formulae in which the electrostatic potential in an arbitrary field point is expressed as a sum of two rapidly converging lattice sums. For N→∞ we obtain formulae applicable for a semi-infinite lattice.  相似文献   

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