传热学第四版例题4-4数值算法计算器

我只是负责把代码从VB和C++翻译到python而已…

#!/usr/bin/env python
# -*- coding=gb2312 -*-

from __future__ import division #python除法纠正
from math import pi #导入圆周率π

print "传热学 例题4-4 数值算法计算器"
print

Theta= [] #定义θn数组
k = int(raw_input("请输入r2/r1的值（2，3，4）："))
N = int(raw_input("请输入节点数N的值："))
m = int(raw_input("请输入参数m的值："))

DeltaR = 1/(N-1) #定义ΔR

for i in range(1,N+1):
    Theta.append(1) #将θn的初值全部取为1

print
print "初值条件设为1。"
print

for j in range(1,10000): #不设定稳定条件，直接算10000次
    for i in range(1,N-1):
        Rn = 1/(k-1)+i/(N-1) #定义Rn数
        #迭代运算θ
        Theta[i] = (2*Rn+DeltaR)/(4*Rn*(1+(DeltaR**2)*(m**2)))*Theta[i+1]+(2*Rn-DeltaR)/(4*Rn*(1+(DeltaR**2)*(m**2)))*Theta[i-1]
    #因为python的数组Theta[0]是第一个，所以需要多算一个Theta[N-2]
    Theta[N-2] = (2*Rn+DeltaR)/(4*Rn*(1+(DeltaR**2)*(m**2)))*Theta[N-1]+(2*Rn-DeltaR)/(4*Rn*(1+(DeltaR**2)*(m**2)))*Theta[N-3]
    Theta[N-1] = Theta[N-2]

print

def main(): #定义肋效率计算函数
    s1 = 0
    s2 = 0
    for i in range(1,N+1):
        R = 1/(k-1)+i/(N-1)
        s1 = s1+R*DeltaR*Theta[i-1]*4*pi
        s2 = s2+R*DeltaR*4*pi
    Fi = s1/s2
    print  "解得肋效率为：",Fi

main()

print

if len(raw_input("按回车键退出或直接关闭窗口…")) == 0:
    exit()