semi-analytical-numerical-method

说明：  一个虎门大桥涡街的udf和fluent仿真教程，适合初学者(A fluent udf example)

计算流体力学软件FLUENT计算空气龄的udf文件(FLUENT CFD software udf file to calculate the air age )

这是一个数值计算Fortran程序，将矩阵进行奇异值分解，SVD.txt存放待分解的矩阵，u.dat,v.dat为分解后的左右矩阵，qiyizhi.dat和qiyizhi0.dat为得到的奇异值。(This is a numerical Fortran program matrix singular value decomposition, SVD.txt store to be factored matrix, u.dat, v.dat about decomposition of the matrix, qiyizhi.dat and singular value obtained qiyizhi0.dat .)

插值法： （1）拉格朗日插值 （2）牛顿插值 （3）分段线性插值 （4）Hermite 插值 （5）样条插值(Interpolation method: (1) Lagrange Interpolation (2) Newton interpolation (3) piecewise linear interpolation (4) Hermite interpolation (5) spline interpolation)

完成不带PML边界的2维声波介质波场正演(Forward modelling of the wave field in two-dimensional acoustic medium)

五点差分法(matlab)解椭圆型偏微分方程方程,分法,偏分,五点差分,椭圆型,偏微分方程(Five-point difference method (matlab) solutions of elliptic partial differential equations, sub-law, partial points, five-point difference, elliptic partial differential equations)

QR方法是一种变换方法，是计算一般矩阵(中小型矩阵)全部特征值问题的最有效方法之一.(QR method is a transformation method is the calculation of the general matrix (small and medium-sized matrix) eigenvalue problem for all of the most effective methods.)

随机加减法计算，可以用来检测加减法口算能力Random add and subtract calculation(Random add and subtract calculation)

说明：  解大规模线性方程组的预条件Gmres方法.系数矩阵可以非对称正定.(Solution of large-scale linear equations of the preconditioned GMRES method. Coefficient matrix can be non-symmetric positive definite.)

此函数通过两点的大地经纬度（Ja,Wa）和（Jb,Wb）计算两点间距离 Dis (this function through the 2:00 and Geodesy (Ja, Wa) and ( `, mg) calculated the distance between two points Dis)