ref_out << u_ref
ranks << mesh_rank
error_total, error_pointwise = compute_errors(u_n, u_ref, V)
error_out << error_pointwise
# set t_1 = t_0 + dt, this gives u_D^1
u_D.t = t + dt(0) # call dt(0) to evaluate FEniCS Constant. Todo: is there a better way?
f.t = t + dt(0)
flux = Function(V_g)
flux.rename("Flux", "")
while precice.is_coupling_ongoing():
if precice.is_action_required(precice.action_write_iteration_checkpoint()): # write checkpoint
precice.store_checkpoint(u_n, t, n)
read_data = precice.read_data()
if problem is ProblemType.DIRICHLET and (domain_part is DomainPart.CIRCULAR or domain_part is DomainPart.RECTANGLE):
# We have to data for an arbitrary point that is not on the circle, to obtain exact solution.
# See https://github.com/precice/fenics-adapter/issues/113 for details.
read_data[(0, 0)] = u_D(0, 0)
# Update the coupling expression with the new read data
precice.update_coupling_expression(coupling_expression, read_data)
dt.assign(np.min([fenics_dt, precice_dt]))
# Compute solution u^n+1, use bcs u_D^n+1, u^n and coupling bcs
solve(a == L, u_np1, bcs)
mesh_rank.rename("myRank", "")
# Generating output files
solution_out = File("output/%s.pvd" % precice.get_participant_name())
ranks = File("output/ranks%s.pvd" % precice.get_participant_name())
# output solution and reference solution at t=0, n=0
n = 0
print('output u^%d and u_ref^%d' % (n, n))
solution_out << u_n
ranks << mesh_rank
while precice.is_coupling_ongoing():
# write checkpoint
if precice.is_action_required(precice.action_write_iteration_checkpoint()):
precice.store_checkpoint(u_n, t, n)
read_data = precice.read_data()
# Update the coupling expression with the new read data
precice.update_coupling_expression(volume_term, read_data)
f.assign(interpolate(volume_term, V))
dt_inv.assign(1 / dt)
# Compute solution u^n+1, use bcs u^n and coupling bcs
a, L = lhs(F), rhs(F)
solve(a == L, u_np1, bc)
# Write data to preCICE according to which problem is being solved