Making the animation shown in an example

Question

In Flow past a dolphin
, what lines can I add to the example code to make the animation of temperature of water over time? (and save it as a movie)

Answer 1

Just dump the results to vtk or xdmf format at the end of each time step. Do animation in, e.g., Paraview. Add something like

f = File('dolfin.pvd')
def update(self):
    f << self.c_, self.t
Problem.update = update

update is the last thing called at the end of a time step.