sph代码学习，用来模拟流体

PISO程序用来计算流场，尤其对非稳态流场的计算非常有效。(PISO program used to calculate the flow field, especially for the calculation of unsteady flow field is very effective.)

1、用欧拉法、四阶龙格库塔法进行插值计算，求解微分方程。（压缩包内的两个小程序） 2、面向微分方程的仿真程序包。（压缩包内的大程序，ALL OF THE PROGRAM.for） 大程序中又增加了变长的龙格库塔运算方法。(1, using Euler, fourth-order Runge-Kutta method for interpolation, solving differential equations. (Compressed within the two small programs) 2, for the differential equation simulation package. (Compressed within a large program, ALL OF THE PROGRAM.for) large program has increased the longer the Runge-Kutta algorithms.)

abaqus在岩土工程中应用，第六章其中的一段源代码，(apply for geotectnical)

说明：  用Fortran语言编写的abaqus，Dflux热源子程序，路径为环形路径(Abaqus, Dflux heat source subroutine written in Fortran language, with a circular path)

重力勘探多次滑动平均方法。给出地址参数，建立网格模型，按网格进行滑动平均。得到平滑后的重力数据。可以去噪。(gravity window moving iteration)

弹性力学问题的边界元—姜弘道,用fortran语言编写的，实例详细(BEM elasticity problems- Jiang Hongdao with fortran language, detailed examples)

2维平面应变+各项同性+J2流动+自定义屈服强度等效塑性应变关系+欧拉后推径向返回(ABAQUS UMAT)

说明：  迭代计算算法，能够完成收敛分析，求解非线性方程根的一个很有效的方法。(Iterative algorithm can complete convergence analysis and solve the roots of non-linear equations.)

用fortran 70实现数值积分，并实例计算了三个函数，导出了积分值和误差(The numerical integration is realized by FORTRAN 70, and three functions are calculated with examples. The integral values and errors are derived.)

it s a sample of abaqus umat subroutine fortran code