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```python |
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#1 Loading functions and modules |
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from fenics import * |
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import matplotlib.pyplot as plt |
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T = 2.0 |
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num_steps = 20 |
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dt = T/num_steps |
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rho = 7500 |
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Cp = 500 |
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k = 50 |
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alpha = k/(rho*Cp) |
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``` |
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```python |
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#2 Create mesh and define function space |
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nx = 0.008 |
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ny = 0.003 |
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mesh = RectangleMesh(Point(0,0),Point(nx,ny),30, 30,'left') |
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V = FunctionSpace(mesh, 'Lagrange', 1) #Lagrange are triangular elements |
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plot(mesh) |
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plt.show() |
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``` |
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 |
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```python |
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# Boundary conditions |
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u0 = Constant(100) |
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def boundary(x, on_boundary): |
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return on_boundary |
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bc = DirichletBC(V,u0, boundary) |
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``` |
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```python |
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u_n = project(1, V) |
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u = TrialFunction(V) |
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v = TestFunction(V) |
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f = Constant(0.0) |
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F = u*v*dx + alpha*dt*dot(grad(u), grad(v))*dx-u_n*v*dx |
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a, L = lhs(F), rhs(F) |
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``` |
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Calling FFC just-in-time (JIT) compiler, this may take some time. |
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```python |
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u = Function(V) |
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t = 0 |
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for n in range(num_steps): |
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t += dt |
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#u0.t = t |
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solve(a == L, u, bc) |
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c = plot(u,) |
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plt.colorbar(c) |
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plt.show() |
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u_n.assign(u) |
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``` |
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Calling FFC just-in-time (JIT) compiler, this may take some time. |
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 |
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 |
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```python |
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1E-7 |
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``` |
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1e-07 |
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```python |
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1e2 |
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``` |
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100.0 |
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```python |
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1E-7+1e2 |
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``` |
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100.0000001 |
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```python |
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``` |