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数值计算方法 二版-ppt(吕同富)
说明: 数值分析第二版吕富同ppt
数值分析学习的参考资料(Numerical Analysis
Reference materials for numerical analysis learning)
- 2020-05-02 11:25:22下载
- 积分:1
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Abaqus-Usdfld
有限元计算软件Abaqus USDFLD子程序在复合材料中强度分析中的应用。(Finite element analysis software Abaqus USDFLD subroutine in the composite material strength analysis applications.)
- 2016-07-03 21:22:32下载
- 积分:1
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preCG
预处理CG算法,在进行共轭梯度法之前先对系数矩阵进行预处理,再进行迭代(pretreatment congruent gradient)
- 2020-08-07 23:08:38下载
- 积分:1
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Euler_DG_Quadrilateral_2D
自己写了一个二维Euler方程的间断有限元程序
上次发了一个三角形单元的程序 因为不是曲边单元 所以在圆柱后面容易形成涡
现在把程序改为曲边四边形单元了 没有涡出现
单元是8节点四边形单元 节点编号顺序是 1 5 2 6 3 7 4 8 也就是四个角点依次
是1 2 3 4 然后是边的中点编号 5 6 7 8.
时间推进采用 Runge-Kutta 方法
数值通量采用全局Lax-Friedrichs通量
仍然不能捕捉激波 因为没有做重构或者加人工粘性 等这个做出来了 再发一次。
程序没有进行优化 比如说内存的消耗没有优化 比如直边单元的边界积分仍然采
用了曲边的积分方法 增加了计算量 比如面积分、线积分都是采用的是Gauss-
Legendre-Lobatto积分 积分精度会比一般的Gauss-Legendre积分精度低一阶 等
等问题。 二维的 纯属交流性质 就没有考虑这些问题 ^_^
如果物面全部是直边 那么只要改变一个参数N 就可以获得不同的计算精度 且具
有谱精度 因为单元的节点是Gauss-Legendre-Lobatto积分点。 其实就是谱元法
(物面是曲边的情况我不清楚是不是也可以通过提高基函数的阶数 也就是增加N
来提高计算精度)(Wrote a two-dimensional Euler equations with discontinuous finite element program
Last made a triangular element of the program, not curved edge unit is so easy to form a vortex in the cylinder behind the
Program to curved edge quadrilateral element vortices appear
Unit is the order of 8-node quadrilateral element node number is 15,263,748 which is the four corners of the points in turn
Is 1234 and then the side of the midpoint of the number 5678.
Time promote the use of Runge-Kutta method
Numerical flux of the overall situation of Lax-Friedrichs, flux
Still can not capture the shock wave did not do the reconstruction or artificial viscosity do it Zaifayici.
The program is not optimized for example, memory consumption is not optimized such as straight-edge boundary integral of the unit is still mining
Integral method to increase the amount of computation such as surface integral with a curved edge, the line integral using the Gauss-
The Legendr)
- 2021-01-29 12:58:40下载
- 积分:1
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bifurcation and LE
计算非线性系统的分叉图和李雅普诺夫指数,用于判断系统的混沌状态,独立的两个文件(a tool to calculate bifurcation and Lyapunov exponent)
- 2018-05-28 22:25:00下载
- 积分:1
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matlab_bgl
说明: 基本图论函数库,应用matlab程序,实现路径规划问题(The MatlabBGL library fills a hole in Matlab s suite of algorithms. Namely, it provides a rich set of algorithms to work with graphs, as in graph theory graphs. The MatlabBGL package uses Matlab s native sparse matrix type as a graph and provides algorithms that work)
- 2009-08-19 10:19:04下载
- 积分:1
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CV
说明: 在CV模型下的卡尔曼滤波算法MATLAB程序(CV model in the Kalman filter algorithm MATLAB program)
- 2009-01-14 11:30:00下载
- 积分:1
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Matrix
采用随机数产生2到10阶的随机矩阵,并实现了矩阵的相关运算,比如:加减,乘除,求逆,求行列式(Using random Numbers generated random matrix from 2 to 10 order , and achieving relative to the implementation of the matrix operations, such as: add and subtract, multiple and divided, inverse and determinant)
- 2013-07-17 06:40:04下载
- 积分:1
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gmres
gmres 方法。视图求解线性方程组A*x=b的解x。nXn的稀疏矩阵A必须是方程且应是大型稀疏矩阵。列向量b的长度必须为n。(gmres method. View solving linear equations A* x = b the solution x. nXn sparse matrix A must be equation and should be large sparse matrix. The length of the column vector b must be to n.)
- 2013-09-13 16:29:56下载
- 积分:1
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dlzd
本程序是用节点导纳矩阵计算三相短路电流
输入数据--形成节点阻抗矩阵--选择故障点---计算短路电流----计算个节点电压---计算指定支路的电流(this procedure is used node admittance matrix calculation of three-phase short-circuit current input data-- forming node impedance matrix-- election Optional fault--- calculation of short-circuit current-voltage computing nodes designated calculated slip road--- Electricity)
- 2006-06-08 17:38:48下载
- 积分:1