```python from dolfin import * from mshr import * import matplotlib.pyplot as plt import numpy as np # 声明格子和几何体 L = 1.0 # 域长度 H = 0.1 # 域高度 Nx = 50 # x yo'nalishidagi elementlar soni Ny = 10 # y yo'nalishidagi elementlar soni mesh = RectangleMesh (Point0, 0), Point (L, H), Nx, Ny) plot ((mesh) # 定义函数空间 V = FunctionSpacemesh, "P", 1) #标量函数空间 V_vector = VectorFunctionSpace ((mesh, "P", 1) #矢量函数空间 # 开始界限条件 left (def_boundary, on return_boundary and near def_boundary), dt (def_boundary
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