我正在尝试访问保存热方程解的 VTK 文件，但我不知道它在 Colab 中的保存位置。
from fenics import *
import time
T = 2.0 # final time
num_steps = 50 # number of time steps
dt = T / num_steps # time step size
# Create mesh and define function space
nx = ny = 30
mesh = RectangleMesh(Point(-2, -2), Point(2, 2), nx, ny)
V = FunctionSpace(mesh, 'P', 1)
# Define boundary condition
def boundary(x, on_boundary):
return on_boundary
bc = DirichletBC(V, Constant(0), boundary)
# Define initial value
u_0 = Expression('exp(-a*pow(x[0], …