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program
FFT A计权 倍频程分析 三分之一倍频程分析(F F T A w eight o c tave a n al o n e t hird o ctave)
- 2011-12-07 14:02:04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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Simpleequationstoachieve
说明: 利用该方程组求解一般的线性方程组,别且符合数学求解原理(Using the equations of linear equations in general, do not and in accordance with principles of mathematics to solve)
- 2010-04-22 10:38:10下载
- 积分:1
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lbm2d
基于D2Q9模型的LBM程序,用于计算方腔驱动流,对应何亚玲《格子Boltzmann方法的理论及应用》一书的源码(LBM D2Q9 model-based program used to calculate the square cavity driven flow, which corresponds He Yaling " Lattice Boltzmann Method Theory and Applications," a source book)
- 2021-03-12 21:19:24下载
- 积分:1
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maze
关于走迷宫算法的实现程序,完全采用C++语言实现,可以运行(Maze algorithm program, fully C++ language, you can run)
- 2012-07-31 22:21:04下载
- 积分:1
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vvuce
使用matlab实现智能预测控制算法,分数阶傅里叶变换计算方面,实现了图像的加水印,去噪,加噪声等功能。( Use matlab intelligent predictive control algorithm, Fractional Fourier transform computing, Realize image watermarking, de-noising, plus noise and other functions.)
- 2017-05-27 12:36:55下载
- 积分:1
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Riemann-problem
一维黎曼问题,计算流体力学,C和Frotran预言代码(Riemann problem)
- 2015-04-29 09:58:22下载
- 积分:1
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EMD-C
EMD分解C语言算法,内含EMD分解所需的三次样条插值C语言算法。(EMD decomposition algorithm C language, containing the decomposition EMD cubic spline interpolation algorithm C language.)
- 2021-02-03 01:10:00下载
- 积分:1
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3
用刷选法求出100之内的素数。并输出数有多少个。(100 prime number is calculated by the method of selection. And the output count how many.)
- 2013-09-11 19:40:35下载
- 积分:1
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fft
对机械中的振动信号进行傅立叶变换,作出频谱图进行分析。(Fourier transform of the vibration signal)
- 2009-10-19 19:01:34下载
- 积分:1