计算混凝土温度场 有限元 fortran程序
时间: 2023-10-22 21:09:31 浏览: 76
以下是一个简单的Fortran程序,用于计算混凝土温度场的有限元模拟:
```
! 程序名称:混凝土温度场有限元模拟
! 作者:Your Name
! 日期:当前日期
program concrete_temperature
implicit none
! 声明变量
integer :: n_nodes, n_elements, i, j, k, node1, node2, node3, node4
real :: x, y, z, t, dt, conductivity, density, specific_heat, temp, residual
real, dimension(:,:), allocatable :: conductivity_matrix, capacity_matrix, temperature, temperature_new, force_vector, stiffness_matrix
! 输入参数
n_nodes = 100 ! 节点数
n_elements = 200 ! 单元数
dt = 1.0 ! 时间步长(秒)
conductivity = 1.0 ! 热导率
density = 1.0 ! 密度
specific_heat = 1.0 ! 比热容
! 动态分配内存
allocate(conductivity_matrix(n_nodes, n_nodes))
allocate(capacity_matrix(n_nodes, n_nodes))
allocate(temperature(n_nodes))
allocate(temperature_new(n_nodes))
allocate(force_vector(n_nodes))
allocate(stiffness_matrix(n_nodes, n_nodes))
! 初始化矩阵
conductivity_matrix = 0.0
capacity_matrix = 0.0
temperature = 0.0
temperature_new = 0.0
force_vector = 0.0
stiffness_matrix = 0.0
! 循环读取节点坐标和节点编号
do i = 1, n_nodes
read(*,*) x, y, z
! 存储节点坐标
! ...
end do
! 循环读取单元编号和节点编号
do i = 1, n_elements
read(*,*) j, node1, node2, node3, node4
! 存储单元信息
! ...
end do
! 循环计算初始温度场
do i = 1, n_nodes
temperature(i) = 20.0 ! 初始温度为20度
end do
! 循环计算刚度矩阵和载荷向量
do i = 1, n_elements
! 计算本地刚度矩阵和载荷向量
! ...
! 将本地矩阵和向量组装成全局矩阵和向量
! ...
end do
! 循环计算温度场
do k = 1, 1000 ! 迭代1000次
residual = 0.0
do i = 1, n_nodes
force_vector(i) = 0.0
do j = 1, n_nodes
force_vector(i) = force_vector(i) + conductivity_matrix(i,j)*temperature(j)
stiffness_matrix(i,j) = conductivity_matrix(i,j)/(dt*density*specific_heat) + capacity_matrix(i,j)/dt
end do
residual = residual + abs(force_vector(i) - stiffness_matrix(i,i)*temperature(i))
end do
if (residual < 1e-6) exit ! 如果残差小于1e-6,则退出迭代
call solve_linear_system(stiffness_matrix, force_vector, temperature_new) ! 解线性方程组
temperature = temperature_new ! 更新温度场
end do
! 输出结果
do i = 1, n_nodes
write(*,*) temperature(i)
end do
! 释放内存
deallocate(conductivity_matrix)
deallocate(capacity_matrix)
deallocate(temperature)
deallocate(temperature_new)
deallocate(force_vector)
deallocate(stiffness_matrix)
end program concrete_temperature
subroutine solve_linear_system(matrix, vector, solution)
! 解线性方程组
end subroutine solve_linear_system
```
这是一个基本的有限元程序,可以根据您的具体需求进行修改和优化。如果您需要更详细的帮助,请提供更多的信息,我会尽力帮助您。
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