I am follow the How to apply time varying boundary conditions coming from a function?
I test this with two def, one is exp(t), another one is a long equation, but except t, all other letters are defined, which are numbers.
blast=Constant((Po*(1-t/t1)*exp(-b*((t-t2)/t1)))/E)
def blast_func(t):
return (Po*(1-t/t1)*exp(-b*((t-t2)/t1)))/E
pexp=Constant(exp(t))
def complicate_func(t):
return exp(t)
a = u*v*dx + dt*dt*c*c*inner(grad(u), grad(v))*dx
L = 2*u1*v*dx - u0*v*dx + pexp*v*ds
bc = DirichletBC(V, 0, rightbound)
#A, b = assemble_system(a, L, bc)
u=Function(V)
vtkfile1=File('wave/u.pvd')
vtkfile2=File('wave/v.pvd')
while t <= T:
A, b = assemble_system(a, L, bc)
solve(A, u.vector(), b)
velocity = (u - u0) / dt
u0.assign(u1)
u1.assign(u)
t += dt
pexp.assign(complicate_func(t))
blast.assign(blast_func(t))
vtkfile1<<(u,t)
vtkfile2 << (project(velocity, V), t)
