def test_majorant(self, problem_params):
# Define the project path
# --------------------------------------------------------------------------------------------------------------#
project_path = postprocess.get_project_path()
# Check if it does exist and create folder for the results
# --------------------------------------------------------------------------------------------------------------#
results_folder_name = postprocess.construct_result_folder_name(
self.dim, test_num, problem_params)
postprocess.create_results_folder(results_folder_name)
# --------------------------------------------------------------------------------------------------------------#
# Define problem data
# --------------------------------------------------------------------------------------------------------------#
# Define the mesh based on the domain geometry
# --------------------------------------------------------------------------------------------------------------#
# Function to generate the mesh
mesh = self.construct_mesh(test_params["nx0"], test_params["nx1"],
test_params["nx2"], test_params["res"],
project_path)
"""
# Plot and save the initial mesh
if self.dim == 2:
postprocess.plot_mesh(mesh, project_path + results_folder_name + 'initial-mesh')
elif self.dim == 3:
postprocess.plot_mesh_3d(mesh, project_path + results_folder_name + 'initial-mesh')
"""
# Get boundary facets function
facet_funcs = FacetFunction('size_t', mesh)
facet_funcs.set_all(0)
# Calculate the estimate for Freidrichs constant based on the domain
C_FD = problem.calculate_CF_of_domain(domain, self.dim)
# Define functional spaces based on the mesh
# --------------------------------------------------------------------------------------------------------------#
V, VV, V_exact, VV_exact, H_div = problem.functional_spaces(
mesh, problem_params, self.dim)
# Define problem data functions
# --------------------------------------------------------------------------------------------------------------#
f, sq_f, phi, grad_phi, u_e, grad_u_e, sq_grad_u_e = self.convert_problem_data_to_expressions(
)
#f, A, invA, adjA, lmbd, a, uD, u_e, grad_u_e = self.convert_problem_data_to_expressions(mesh, test_params)
# Majorant parameter
delta = 1.0
# Output to console the problem data
problem.output_problem_characteristics(
self.test_num, self.u_expr, self.grad_u_expr, self.f_expr,
self.A_expr, self.lambda_expr, self.a_expr,
self.uD_expr, self.domain, self.T, self.dim, mesh.num_cells(),
mesh.num_vertices(), test_params["nt"],
test_params["v_approx_order"], test_params["flux_approx_order"],
delta)
# Run the solver with a posteriori error control
# --------------------------------------------------------------------------------------------------------------#
t0_problem = time.clock()
self.solve_problem_nd_t(
mesh,
V,
VV,
V_exact,
VV_exact,
H_div,
f,
sq_f,
phi,
grad_phi,
u_e,
grad_u_e,
sq_grad_u_e,
u_e,
self.u0_boundary, # Dirichlet boundary condition
self.dim,
self.T,
self.domain,
C_FD,
delta,
self.test_num,
test_params,
project_path,
results_folder_name)
t1_problem = time.clock()
print "time = ", t1_problem - t0_problem
def solve_problem_nd_t(self, mesh, V, VV, V_exact, VV_exact, H_div, f,
sq_f, phi, grad_phi, u_e, grad_u_e, sq_grad_u_e,
u_0, u0_boundary, dim, t_T, domain, C_FD, delta,
test_num, problem_params, project_path,
results_folder):
# Define the value of the time-step
nt = problem_params["nt"]
tau = float(t_T / nt)
eps_k = problem_params['total_accuracy'] / nt
# Initialize times
t_k = 0 # t_k
t_kp1 = tau # t_{k + 1}
t_km1 = -tau # t_{k - 1}
# Initialize the time integration scheme
order = 4 # time integration order 2, 3, 4
quadrature = integrators.TimeIntegrator(order, t_k, t_kp1)
# Allocate the space for the arrays
ed_k, et_k, e_incr_k, error_k, m0_k, md_k, mf_k, maj_incr_k, majorant_k, beta_k, i_eff_maj_k = \
estimates.allocate_space_for_error_and_majorant(nt)
h_max_k = postprocess.allocate_array(nt)
h_min_k = postprocess.allocate_array(nt)
error_d_k = postprocess.allocate_array(nt)
majorant_d_k = postprocess.allocate_array(nt)
vd_k = postprocess.allocate_array(nt)
vt_k = postprocess.allocate_array(nt)
v_norm_incr_k = postprocess.allocate_array(nt)
v_norm_k = postprocess.allocate_array(nt)
rel_error_k = postprocess.allocate_array(nt)
rel_majorant_k = postprocess.allocate_array(nt)
primal_problem_time = postprocess.allocate_array(nt)
majorant_minimization_time = postprocess.allocate_array(nt)
majorant_reconstruction_time = postprocess.allocate_array(nt)
# Initialize the approximation and flux on the t = t_k
v_k = interpolate(phi, V)
y_k = interpolate(grad_phi, H_div)
v_k1 = Function(V)
# Initialize the counter
k = 0
error = 1e8
while k + 1 <= nt:
t0_problem = tic()
# Update the time integration for the quadratures
print "\n-----------------------------------------"
print "Time interval [%f, %f]:" % (t_k, t_kp1)
print "------------------------------------------\n"
quadrature.update(t_k, t_kp1)
#while error > eps_k:
if k == 0 or problem_params[
'solving_strategy_tag'] == "with-refinement":
# Define unknown function and test function
u = TrialFunction(V) # unknown function
v = TestFunction(V) # test function for the variational form
# Define stiffness and mass matrices based on the functional space
K, M = problem.construct_stiffness_and_mass_matrices(u, v, dim)
# Define BC
bc = DirichletBC(V, u_0, u0_boundary)
# Update right hand side f_{k}
f.t = t_k
f_k = interpolate(f, V)
# Update right hand side f_{k + 1}
f.t = t_kp1
f_k1 = interpolate(f, V)
# Update boundary condition
u_0.t = t_kp1
# Update the exact solution at t_{k + 1}
u_e.t = t_kp1
u_k1 = interpolate(u_e, V_exact)
v_k1 = problem.get_next_step_solution(
v_k, v_k1, K, tau, M, f_k, f_k1, bc,
problem_params['time_discretization_tag'])
# u_0.t = t_kp1
# v_k1 = interpolate(u_e, V)
'''
if (problem_params['solving_strategy_tag'] == 'without-refinement' and k == 0) or \
problem_params['solving_strategy_tag'] == 'with-refinement':
postprocess.plot_solution(v_k1, mesh, dim, project_path + results_folder + 'u-%d' % (k + 1))
'''
grad_v_k = problem.Grad(v_k, dim)
grad_v_k1 = problem.Grad(v_k1, dim)
# Define y_1 as a derivative with respect to x_i = x_0 = x[0]
y_k1 = project(grad_v_k1, H_div)
# Check the exact flux (test)
# grad_phi.t = t_kp1
# y_k1 = project(grad_phi, H_div)
v_norm_incr_k, vd_k, vt_k = estimates.v_norm_nd_t(
k, v_norm_incr_k, vd_k, vt_k, v_k, v_k1, V_exact, VV_exact,
mesh, dim, tau, delta)
#v_norm_incr_k, vd_k, vt_k = estimates.v_norm_nd_t(k, v_norm_incr_k, vd_k, vt_k,
# v_k1, grad_v_k, grad_v_k1,
# V_exact, VV_exact,
# mesh, dim, tau, delta)
# Calculate error components
e_incr_k, ed_k, et_k, ed_var = estimates.error_norm_nd_t(
k, e_incr_k, ed_k, et_k, grad_u_e, sq_grad_u_e, quadrature,
u_k1, v_k1, grad_v_k, grad_v_k1, V_exact, VV_exact, mesh, dim,
tau, delta)
# Calculate majorant components
maj_incr_k, m0_k, md_k, mf_k, beta_k, y_k1, md_var, mf_var = \
estimates.majorant_nd_t(k, maj_incr_k, m0_k, md_k, mf_k, beta_k, e_incr_k[k], ed_k[k], et_k[k],
f, sq_f, phi, quadrature,
v_k, v_k1, grad_v_k, grad_v_k1, V_exact,
y_k, y_k1, H_div,
mesh, tau, delta, dim, domain, C_FD,
majorant_reconstruction_time, majorant_minimization_time)
e_distr, md_distr, maj_distr = estimates.error_majorant_distribution_nd(
mesh, dim, ed_var, md_var, mf_var, V_exact)
e_distr, md_distr, maj_distr = estimates.majorant_distribution_DG0(
mesh, ed_var, md_var, mf_var)
# Document indicator perpormance
h_max_k[k] = mesh.hmax()
h_min_k[k] = mesh.hmin()
init_data_info = postprocess.construct_result_tag(
test_num, problem_params["nx0"], problem_params["nx1"],
problem_params["nx2"], nt, k + 1)
# Update the overall error from time interval [0, t_k]
error_k, majorant_k, i_eff_maj_k, rel_error_k, rel_majorant_k = \
estimates.add_increment_of_error_and_majorant(k, e_incr_k, maj_incr_k, error_k, et_k, majorant_k,
i_eff_maj_k,
v_norm_incr_k, v_norm_k, vt_k, rel_error_k, rel_majorant_k)
postprocess.output_time_layer_result_error_and_majorant(
t_k, t_kp1, rel_error_k[k], rel_majorant_k[k], i_eff_maj_k[k])
error = error_k[k]
# Define the solving strategy (refine or not refine)
if problem_params['solving_strategy_tag'] == "with-refinement":
if dim == 2 and problem_params[
'refinement_criteria_tag'] == "majorant":
postprocess.plot_carpet_2d(
mesh, project(ed_var, V_exact), project_path +
results_folder + 'carpet-error' + init_data_info)
postprocess.plot_carpet_2d(
mesh, project(md_var, V_exact), project_path +
results_folder + 'carpet-majorant' + init_data_info)
# Refine mesh
mesh = self.execute_refinement_strategy(
problem_params, mesh, e_distr, md_distr, maj_distr,
error_k, majorant_k, i_eff_maj_k, error_d_k, majorant_d_k,
h_max_k, h_min_k, t_T, k, nt, project_path, results_folder,
init_data_info)
# num_cells = mesh.num_cells()
# num_vertices = mesh.num_vertices()
# results_info = postprocess.construct_result_tag(test_num, nt, nx0, nx1, nx2, k+1, num_cells, num_vertices, dim)
# Update functional spaces, BC, and stiffness/mass matrices
V, VV, V_exact, VV_exact, H_div = problem.functional_spaces(
mesh, problem_params, dim)
# Update functions
#v_k1.set_allow_extrapolation(True)
#y_k1.set_allow_extrapolation(True)
v_k.assign(interpolate(v_k1, V))
#v_k.assign(project(v_k1, V))
#v_k.assign(v_k1)
y_k.assign(interpolate(y_k1, H_div))
v_k1 = Function(V)
else:
# Document results
postprocess.document_results_without_refinement(
mesh, e_distr, md_distr, error_k, majorant_k, i_eff_maj_k,
error_d_k, majorant_d_k, h_max_k, h_min_k, t_T, k, nt,
project_path, results_folder, init_data_info)
# Update functions
v_k.assign(v_k1)
y_k.assign(y_k1)
# Update time layer
t_kp1 += tau
t_km1 += tau
t_k += tau
k += 1
def solve_problem_nd_t(self, mesh, boundary_facets, ds, dS, V, VV, V_exact,
VV_exact, H_div, u_e, grad_ue, f, A, invA, adjA,
min_eig_A, lmbd, a, u0, uD, uN, C_FD, C_Ntr, delta,
gamma, project_path, results_folder, test_params):
# Define the number of refinements
ref_num = test_params['number_of_refinements']
ref_num_array = postprocess.allocate_array(ref_num)
h_max_array = postprocess.allocate_array(ref_num)
h_min_array = postprocess.allocate_array(ref_num)
DOFs = postprocess.allocate_array(ref_num)
numcells_array = postprocess.allocate_array(ref_num)
numverts_array = postprocess.allocate_array(ref_num)
e_H1_array = postprocess.allocate_array(ref_num)
e_L2_array = postprocess.allocate_array(ref_num)
e_total_array = postprocess.allocate_array(ref_num)
maj_array = postprocess.allocate_array(ref_num)
maj_II_array = postprocess.allocate_array(ref_num)
min_array = postprocess.allocate_array(ref_num)
i_eff_maj_array = postprocess.allocate_array(ref_num)
i_eff_maj_II_array = postprocess.allocate_array(ref_num)
i_eff_min_array = postprocess.allocate_array(ref_num)
rel_error_k = postprocess.allocate_array(ref_num)
rel_majorant_k = postprocess.allocate_array(ref_num)
e_L_array = postprocess.allocate_array(ref_num)
e_id_array = postprocess.allocate_array(ref_num)
# Initialize the variables before the loop
maj = 10e8
i = 0
while i <= ref_num - 1:
print(" ")
print(
"%-----------------------------------------------------------------------------------------------------------%"
)
print " Refinement cycle # %d : DOFs = %d" % (
i, len(V.dofmap().dofs()))
print(
"%-----------------------------------------------------------------------------------------------------------%"
)
print(" ")
# Compute approximate solution, its error and majorant
u, delta_stab = problem.solve_convection_reaction_diffusion(
V, c_H, eps, f, A, min_eig_A, lmbd,
problem.interpolate_vector_function(a, dim, V_exact,
VV_exact), u0, uD, uN,
mesh, boundary_facets, self.dim, self.test_num, test_params)
#u = problem.solve_parabolic_problem(V, c_H, eps, f, A, u0, uD, mesh, boundary_facets, dim, test_num)
# In case of explicitely unknown exact solution, calculate it with high order order polynomials
if test_params['solution_tag'] == "reference-solution":
# Compute reference solution with high order polynomials
u_e, delta_stab_e = problem.solve_convection_reaction_diffusion(
V_exact, c_H, eps, f, A, min_eig_A, lmbd,
problem.interpolate_vector_function(
a, dim, V_exact, VV_exact), u0, uD, uN, mesh,
boundary_facets, self.dim, self.test_num, test_params)
#u_e = problem.solve_parabolic_problem(V_exact, c_H, eps, f, u0, uD, mesh, boundary_facets, dim, test_num)
#'''
if test_params["PLOT"] == True and ref_num <= 3:
# Plot approximate solution
postprocess.plot_function_3d(
mesh, u, project_path + results_folder + 'u-%d' % i)
#postprocess.plot_function_3d(mesh, u_e, project_path + results_folder + 'ue-%d' % i)
#postprocess.plot_function(u_e, mesh, dim, project_path + results_folder + 'u-ref-%d' % i)
#postprocess.plot_function_3d(mesh, f, project_path + results_folder + 'ue-ref-%d' % i)
#postprocess.plot_function(u, mesh, dim, project_path + results_folder + 'u-%d' % i)
#'''
# Calculate error
e, val_e, val_grad_e, val_delta_e, e_T, val_e_L, val_e_id, \
var_e, var_delta_e, var_grad_e = estimates.error_norm(u, u_e, A, lmbd,
problem.interpolate_vector_function(a, dim, V_exact, VV_exact),
f, c_H,
test_params["v_approx_order"],
mesh, T, dim, V, V_exact)
# Define the error for the majorant
error = (2 - delta) * val_grad_e + 2 * val_delta_e + c_H * e_T
error_II = (2 - delta) * val_grad_e + 2 * val_delta_e + (
1 - 1 / gamma) * c_H * e_T
if test_params["error_estimates"] == True:
# Calculate majorant
#y_ = project(A * NablaGrad(u_e, dim), V)
#y = project(A * NablaGrad(u, dim), H_div)
#y = project(A * NablaGrad(interpolate(u_e, V_exact), dim), H_div)
y = project(A * NablaGrad(u, dim), H_div)
"""
if test_params['solution_tag'] == 'predefined-solution':
y = project(A * NablaGrad(u, dim), H_div)
elif test_params['solution_tag'] == 'reference-solution':
y = project(A * NablaGrad(interpolate(u_e, V_exact), dim), H_div)
"""
#print ' y - y_ = ', assemble(inner(y - y_, y - y_) * dx)
#y = interpolate(problem.Grad(u, dim), H_div)
MAJORANT_OPTIMIZE = 1
#y = project(problem.Grad(u_e, dim), H_div)
#MAJORANT_OPTIMIZE = 1
# Calculate majorant
maj, y, beta, md, mf, var_m_d, var_m_f_w_opt, \
majorant_reconstruction_time, majorant_minimization_time = \
estimates.majorant_nd(u, V_exact, y, H_div,
f, A, invA, min_eig_A, c_H, eps, lmbd, a,
u0, error, mesh, C_FD, dim, test_params)
i_eff_maj = sqrt(maj / error)
maj_array[i] = maj
i_eff_maj_array[i] = i_eff_maj
#w = project(u_e - interpolate(u, W), W)
# Calculate majorant
#maj_II, beta, majorant_reconstruction_time, majorant_minimization_time = \
# estimates.majorant_II_nd(u, V_exact, w, W, y, f, u0, error_II, gamma, T, mesh, C_FD, dim, v_deg, MAJORANT_OPTIMIZE)
#i_eff_maj_II = sqrt(maj_II / error)
# Construct error and majorant distribution
#e_distr, m_distr, maj_distr = estimates.majorant_distribution_using_DG0(e, rd, rf, A, invA, beta, C_FD, mesh, dim)
# , mf_distr, maj_distr, ed, md = \
ed_distr, md_distr, maj_distr = \
estimates.error_majorant_distribution_nd(mesh, dim, V,
var_grad_e, var_delta_e,
var_m_d, var_m_f_w_opt, beta, C_FD)
#min, phi = estimates.minorant(u, mesh, V_exact, u_0, boundary, f, dim, error)
#i_eff_min = sqrt(min / error)
#estimates.output_result_minorant(min, min/error)
min = 0.0
i_eff_min = 0.0
#residual_CG0_distr, e_DWR_CG0_distr, J_e_CG0_distr = estimates.get_indicators_CG0(e, sqrt(error), V, V_exact, f, u0, boundary, u, u_e,
# mesh, dim)
#eta_distr_, E_DWR_distr_, J_e_distr_, m_d_distr_, m_df_distr_ = \
# majorants.compare_error_indicators(mesh, V, V_exact, V_exact, f, u0, boundary, u, interpolate(u_e, V_exact), y, beta, test_num)
# Update the arrays of data with respect to the refinement cycle
ref_num_array[i] = i
e_H1_array[i] = sqrt(val_grad_e)
e_L2_array[i] = sqrt(val_e)
e_total_array[i] = sqrt(error)
e_L_array[i] = sqrt(val_e_L)
e_id_array[i] = sqrt(val_e_id)
maj_array[i] = sqrt(maj)
i_eff_maj_array[i] = sqrt(maj / error)
maj_array[i] = sqrt(maj)
i_eff_min_array[i] = sqrt(min / error)
h_max_array[i] = mesh.hmax()
h_min_array[i] = mesh.hmin()
DOFs[i] = len(V.dofmap().dofs())
num_cells = mesh.num_cells()
num_verts = mesh.num_vertices()
numcells_array[i] = num_cells
numverts_array[i] = num_verts
# Output the results of upper bound reconstructions
estimates.output_result_error_and_majorant(sqrt(error), sqrt(maj),
sqrt(maj / error))
# Construct the tag with problem information
results_info = postprocess.construct_result_tag(
test_num, i, test_params["nx0"], test_params["nx1"],
test_params["nx2"], num_cells, num_verts)
# Plot and document mesh on the current refinement iteration
postprocess.document_results(mesh, test_params, project_path,
results_folder, results_info,
ed_distr, md_distr, maj_distr, error,
maj, i_eff_maj, min, i_eff_min,
h_max_array, h_min_array)
# Refine mesh
#mesh = self.execute_refiniment_strategy(mesh, test_params, e_distr, m_distr)
mesh = self.execute_refiniment_strategy(mesh, test_params,
ed_distr, md_distr)
# Update functional spaces, BC, and stiffness/mass matrices
V, VV, V_exact, VV_exact, H_div = problem.functional_spaces(
mesh, test_params, dim)
# Update boundary faces
boundary_facets, ds, dS = self.construct_boundary_faces(mesh)
i = i + 1
decay_result_folder = postprocess.create_decay_tag(
test_params, project_path, results_folder, results_info)
postprocess.document_errors_decay(float(dim), test_params,
decay_result_folder, DOFs[0:i],
h_min_array[0:i], e_H1_array[0:i],
e_L2_array[0:i], maj_array[0:i],
min_array[0:i], i_eff_maj_array[0:i],
e_L_array[0:i], e_id_array[0:i])
def test_estimates(self, test_params):
# Define the project path
# --------------------------------------------------------------------------------------------------------------#
project_path = postprocess.get_project_path()
# Check if it does exist and create folder for the results
# --------------------------------------------------------------------------------------------------------------#
results_folder_name = postprocess.construct_result_folder_name(
self.dim, test_num, test_params)
postprocess.create_results_folder(results_folder_name, test_params)
# --------------------------------------------------------------------------------------------------------------#
# Define problem data
# --------------------------------------------------------------------------------------------------------------#
# Define the mesh based on the domain geometry
# --------------------------------------------------------------------------------------------------------------#
mesh = self.construct_mesh(test_params["nx0"], test_params["nx1"],
test_params["nx2"], test_params["nt"],
test_params["res"], project_path)
if test_params["PLOT"] == True:
# Plot and save the initial mesh
file_name = project_path + results_folder_name + 'initial-mesh'
if self.dim == 2: postprocess.plot_mesh(mesh, file_name)
elif self.dim == 3: postprocess.plot_mesh_3d(mesh, file_name)
boundary_facets, ds, dS = self.construct_boundary_faces(mesh)
# Calculate the estimate for Freidrichs constant based on the domain
C_FD = problem.calculate_CF_of_domain(domain, self.dim - 1)
C_Ntr = problem.calculate_trace_constant(self.test_num)
# Define functional spaces based on the mesh
#--------------------------------------------------------------------------------------------------------------#
V, VV, V_exact, VV_exact, H_div = \
problem.functional_spaces(mesh, test_params, self.dim)
# Define problem data functions
#--------------------------------------------------------------------------------------------------------------#
f, A, invA, adjA, lmbd, a, uD, uN, u0, u_e, grad_u_e = self.convert_problem_data_to_expressions(
mesh, test_params)
# Majorant parameters
delta = 1
# gamma = 1.5
# gamma = 2
gamma = 1
# Output to console the problem data
problem.output_problem_characteristics(self.test_num, self.u_expr,
self.grad_u_expr, self.f_expr,
self.domain, self.dim,
mesh.num_cells(),
mesh.num_vertices(),
test_params["v_approx_order"])
t0_problem = time.clock()
self.solve_problem_nd_t(mesh, boundary_facets, ds, dS, V, VV, V_exact,
VV_exact, H_div, u_e, grad_u_e, f, A, invA,
adjA, self.min_eig_A, lmbd, a, u0, uD, uN,
C_FD, C_Ntr, delta, gamma, project_path,
results_folder_name, test_params)
t1_problem = time.clock()
print("time = %d s" % (t1_problem - t0_problem))
def solve_problem_nd_t(self, mesh, boundary_facets, ds, dS, V, V_exact,
VV_exact, H_div, u_e, f, A, invA, adjA, min_eig_A,
lmbd, a, eps_curr, uD, uN, C_FD, C_Ntr,
project_path, results_folder, test_params):
# Define the number of refinements
ref_num = test_params['number_of_refinements'] + 20
# Define arrays with data collected on the refinement steps
ref_num_array = postprocess.allocate_array(ref_num + 1)
h_max_array = postprocess.allocate_array(ref_num + 1)
h_min_array = postprocess.allocate_array(ref_num + 1)
dofs_array = postprocess.allocate_array(ref_num + 1)
numcells_array = postprocess.allocate_array(ref_num + 1)
numverts_array = postprocess.allocate_array(ref_num + 1)
e_array = postprocess.allocate_array(ref_num + 1)
e_l2_array = postprocess.allocate_array(ref_num + 1)
e_linf_array = postprocess.allocate_array(ref_num + 1)
e_min_array = postprocess.allocate_array(ref_num + 1)
maj_array = postprocess.allocate_array(ref_num + 1)
min_array = postprocess.allocate_array(ref_num + 1)
i_eff_maj_array = postprocess.allocate_array(ref_num + 1)
i_eff_min_array = postprocess.allocate_array(ref_num + 1)
# Initialize the variables before the loop
maj = 10e8
i = 0
h_min = 10e8
# TO DO: Calculate the reference solution on the refined mesh
'''
if test_params['solution_tag'] == "reference-solution":
mesh_ref = self.construct_mesh(2 ** ref_num * test_params["nx0"],
2 ** ref_num * test_params["nx1"],
2 ** ref_num * test_params["nx2"],
2 ** ref_num * test_params["res"], project_path)
# Update functional spaces, BC, and stiffness/mass matrices
V_ref, VV_ref, V_ref_exact, VV_ref_exact, H_ref_div = problem.functional_spaces(mesh_ref,
test_params["v_approx_order"],
test_params["flux_approx_order"],
dim)
boundary_facets_ref, ds = self.construct_boundary_faces(mesh_ref)
u_e, delta = problem.solve_convection_reaction_diffusion(V_ref_exact, f, A, min_eig_A, lmbd,
problem.interpolate_vector_function(a, dim, V_ref_exact, VV_ref_exact),
self.boundary, uD, uN,
mesh_ref, boundary_facets_ref,
dim, test_num)
'''
while h_min > eps_curr: # (i <= ref_num and maj > test_params['accuracy_level']) or
print(" ")
print(
"%-----------------------------------------------------------------------------------------------------------%"
)
print " Refinement cycle # %d : DOFs = %d" % (
i, len(V.dofmap().dofs()))
print(
"%-----------------------------------------------------------------------------------------------------------%"
)
print(" ")
# Compute approximate solution u and stabilization parameter (in case of the convection dominated problem)
u, delta = problem.solve_convection_reaction_diffusion(
V, f, A, min_eig_A, lmbd,
problem.interpolate_vector_function(a, dim, V_exact, VV_exact),
self.boundary, uD, uN, mesh, boundary_facets, self.dim,
self.test_num, test_params)
# In case of explicitely unknown exact solution, calculate it with high order order polynomials
if test_params['solution_tag'] == "reference-solution":
# Compute reference solution with high order polynomials
u_e, delta = problem.solve_convection_reaction_diffusion(
V_exact, f, A, min_eig_A, lmbd,
problem.interpolate_vector_function(
a, dim, V_exact,
VV_exact), self.boundary, uD, uN, mesh,
boundary_facets, self.dim, self.test_num, test_params)
if test_params["PLOT"] == True:
#plot(u, interactive=True)
# Plot approximate solution
postprocess.plot_function(
u, mesh, dim, project_path + results_folder + 'u-%d' % i)
# Calculate error
grad_e, e_l2, e_linf, delta_e, lambda_e, a_e, var_grad_e, var_lmbd_diva_e, var_lmbd_e, var_a_e = \
estimates.error_norm(u, u_e, lmbd, A, invA,
a,
problem.interpolate_vector_function(a, dim, V_exact, VV_exact),
V, V_exact, mesh, dim)
# Define the error for the majorant
error = grad_e + delta_e
# Define the error for the minorant
if test_params[
"pde_tag"] == "reaction-diffusion-pde" or test_params[
"pde_tag"] == "diffusion-pde":
error_min = grad_e + delta_e
elif test_params[
"pde_tag"] == "reaction-convection-diffusion-pde" or test_params[
"pde_tag"] == "convection-diffusion-pde":
error_min = grad_e + lambda_e + a_e
if test_params["error_estimates"] == True:
# L2-projection of grad u to Hdiv space
y = project(A * Grad(u, dim), H_div)
# Test for the correctness of the code and the majorant for the y = A dot \grad u
# y = interpolate(A * Grad(u, dim), H_div)
#y = project(A * Grad(u_e, dim), H_div)
# Contruct the majorant
maj, y, beta, md, mf, var_m_d, var_m_f_w_opt, \
majorant_reconstruction_time, majorant_minimization_time = \
estimates.majorant_nd(u, y, H_div, f, A, invA, min_eig_A, eps, a, lmbd, error, mesh, dim, C_FD, C_Ntr, test_params)
# Output the results of upper bound reconstructions
estimates.output_result_error_and_majorant(
sqrt(error), sqrt(maj), sqrt(maj / error))
# Construct error and majorant distribution
ed_distr, delta_e_distr, e_distr, md_distr, mf_distr, maj_distr, ed, md = \
estimates.error_majorant_distribution_nd(mesh, dim, V_exact,
var_grad_e, var_lmbd_diva_e, var_m_d, var_m_f_w_opt, beta)
# Calculate the smoothness parameter
#smoothness_distr = problem.smoothness_distribution(u, mesh, dim)
#print "smoothness ", smoothness_distr
#smooth_criterion = problem.SmoothnessCriterion(v=interpolate(u, V_exact), mesh=mesh,
# expression_degree=test_params["expression_degree"])
#smoothness_vals = project(smooth_criterion, FunctionSpace(mesh, "DG", 0))
#print "smoothness_vals:", smoothness_vals.vector().array()
# Calculate minorant
min, phi = estimates.minorant(u_e, u, mesh, ds, V_exact, uN,
self.boundary, f, A, lmbd, a,
dim, test_params)
# Output the results of lower bound reconstructions
estimates.output_result_minorant(sqrt(error_min), sqrt(min),
sqrt(min / error_min))
maj_array[i] = sqrt(maj)
i_eff_maj_array[i] = sqrt(maj / error)
min_array[i] = sqrt(min)
i_eff_min_array[i] = sqrt(min / error_min)
if test_params["pde_tag"] == "reaction-convection-diffusion-pde" \
or test_params["pde_tag"] == "convection-diffusion-pde":
e_min_array[i] = sqrt(error_min)
else:
e_min_array[i] = e_array[i]
'''
#tag = 'E-DWR-'
#tag = 'eta-'
#tag = 'error-'
#tag = 'm-d-'
#tag = 'm-df-'
eta_distr, E_DWR_distr, J_e_distr, m_d_distr, m_df_distr = \
compare_error_indicators(mesh, V, V_star, V_e, f, u_0, boundary, u,
interpolate(u_e, V_e), interpolate(grad_u_e, VV_e),
y, beta, test_num, tag)
cells_num = mesh.num_cells()
N_array[i] = cells_num
e_array[i] = sum(J_e_distr)
if tag == 'eta-':
distr = eta_distr
elif tag == 'E-DWR-':
distr = E_DWR_distr
elif tag == 'error-':
distr = J_e_distr
elif tag == 'm-d-':
distr = m_d_distr
elif tag == 'm-df-':
distr = m_df_distr
'''
'''
md_CG0_distr, mdf_CG0_distr, e_CGO_distr = estimates.majorant_distribution_DG0(mesh, f, lmbd, A, invA, u, e_form, y, beta, C_FD, dim)
residual_CG0_distr, e_DWR_CG0_distr, J_e_CG0_distr = estimates.get_indicators_CG0(mesh, V, V_exact, f, A, adjA, lmbd, u_0, boundary, u, u_e,
e_form, sqrt(e_d), dim)
# Plot histograms with obtained indicators
postprocess.plot_histogram(mesh, J_e_CG0_distr, residual_CG0_distr,
project_path + results_folder + 'je-residual-distr-hist' + results_info)
postprocess.plot_histogram(mesh, J_e_CG0_distr, e_DWR_CG0_distr,
project_path + results_folder + 'je-edwr-distr-hist' + results_info)
# Plot histograms with obtained indicators from majorant
postprocess.plot_histogram(mesh, J_e_CG0_distr, md_CG0_distr,
project_path + results_folder + 'je-md-distr-hist' + results_info)
postprocess.plot_histogram(mesh, J_e_CG0_distr, mdf_CG0_distr,
project_path + results_folder + 'je-mdf-distr-hist' + results_info)
'''
# Update the arrays of data with respect to the refinement cycle
ref_num_array[i] = i + 1
e_array[i] = sqrt(error)
e_l2_array[i] = e_l2
e_linf_array[i] = e_linf
h_max_array[i] = mesh.hmax()
h_min_array[i] = mesh.hmin()
h_min = mesh.hmin()
print "hmax = ", mesh.hmax()
print "hmin = ", mesh.hmin()
num_cells = mesh.num_cells()
num_vertices = mesh.num_vertices()
num_dofs = len(V.dofmap().dofs())
numcells_array[i] = num_cells
numverts_array[i] = num_vertices
dofs_array[i] = num_dofs
# Construct the tag with problem information
results_info = postprocess.construct_result_tag(
test_num, i, test_params["nx0"], test_params["nx1"],
test_params["nx2"], num_cells, num_vertices)
# Plot histogram with the error and majorant distribution
#postprocess.plot_histogram(mesh, ed_distr, md_distr,
# project_path + results_folder + 'e-maj-distr-hist' + results_info)
#postprocess.plot_histogram_smoothness(mesh, mf_distr, 'k',
# project_path + results_folder + 'mf-distr-hist' + results_info)
#postprocess.plot_histogram_smoothness(mesh, smoothness_distr, 'b',
# project_path + results_folder + 'smoothness-distr-hist' + results_info)
# For the refinement accept the last one change the mesh-dependent values like spaces and mesh functions
if ref_num > 0 and i + 1 <= ref_num:
# If the error estimates are constructed, then the mesh refinement can vary: uniform or adaptive
if test_params["error_estimates"] == True:
# Refine mesh
mesh, mat_file_tag = self.execute_refinement_strategy(
test_params, mesh, e_distr, md_distr, project_path,
results_folder, results_info)
# Save the results in mat-file
postprocess.save_results_to_mat_file(
ed_distr, md_distr, e_array, maj_array,
i_eff_maj_array, e_min_array, min_array, mat_file_tag)
if i + 1 == ref_num:
postprocess.save_mesh_to_xml_file(
mesh, project_path + results_folder, results_info)
# If the refiniment strategy is adaptive, that plot the changes in the mesh, majorant, and the error
if test_params['refinement_tag'] == "adaptive":
if test_params["PLOT"] == True:
# Plot result mesh
if dim == 2:
postprocess.plot_mesh(
mesh, project_path + results_folder +
'mesh' + results_info)
# Plot 'carpets with colored elements' dependent on the error and the majorant
#postprocess.plot_carpet_2d(mesh, ed,
# project_path + results_folder + 'carpet-error' + results_info)
#postprocess.plot_carpet_2d(mesh, md,
# project_path + results_folder + 'carpet-majorant' + results_info)
elif dim == 3:
postprocess.plot_mesh_3d(
mesh, project_path + results_folder +
'initial-mesh')
# If the error estimates aren't constructed, the mesh refinement is uniform
else:
mesh = refine(mesh)
# Update functional spaces, BC, and stiffness/mass matrices
V, VV, V_exact, VV_exact, H_div = problem.functional_spaces(
mesh, test_params, dim)
if test_params[
'material_tag'] == "material-changing": # over the domain
# Define A if it is changing
A = problem.construct_from_mesh_functions(
dim, self.A_expr, mesh)
boundary_facets, ds, dS = self.construct_boundary_faces(mesh)
# Define the value of the maj for the loop criteria
if test_params["error_estimates"] == True:
maj = maj_array[i]
else:
maj = e_array[i]
# Update the refinement number
i += 1
# Output the results
decay_result_folder = postprocess.create_decay_tag(
test_params, project_path, results_folder, results_info)
postprocess.document_errors_decay(float(self.dim), test_params,
decay_result_folder, dofs_array[0:i],
h_min_array[0:i], e_array[0:i],
e_l2_array[0:i], e_linf_array[0:i],
e_min_array[0:i], maj_array[0:i],
min_array[0:i])
return mesh, V, VV, V_exact, VV_exact, H_div, boundary_facets, ds, dS
def test_estimates(self, test_params):
# Define the project path
# --------------------------------------------------------------------------------------------------------------#
project_path = postprocess.get_project_path()
# Check if it does exist and create folder for the results
# --------------------------------------------------------------------------------------------------------------#
results_folder_name = postprocess.construct_result_folder_name(
self.dim, test_num, test_params)
postprocess.create_results_folder(results_folder_name, test_params)
# --------------------------------------------------------------------------------------------------------------#
# Define problem data
# --------------------------------------------------------------------------------------------------------------#
# Define the mesh based on the domain geometry
# --------------------------------------------------------------------------------------------------------------#
mesh = self.construct_mesh(test_params["nx0"], test_params["nx1"],
test_params["nx2"], test_params["res"],
project_path)
if test_params["PLOT"] == True:
# Plot and save the initial mesh
if self.dim == 2:
postprocess.plot_mesh(
mesh, project_path + results_folder_name + 'initial-mesh')
elif self.dim == 3:
postprocess.plot_mesh_3d(
mesh, project_path + results_folder_name + 'initial-mesh')
boundary_facets, ds, dS = self.construct_boundary_faces(mesh)
# Calculate the estimate for Freidrichs constant based on the domain
C_FD = problem.calculate_CF_of_domain(domain, self.dim)
C_Ntr = self.calculate_trace_constant()
# Define functional spaces based on the mesh
#--------------------------------------------------------------------------------------------------------------#
V, VV, V_exact, VV_exact, H_div = \
problem.functional_spaces(mesh, test_params, self.dim)
# Define problem data functions
eps = 1e0 # initialize the eps
#--------------------------------------------------------------------------------------------------------------#
f, A, invA, adjA, min_eig_A, lmbd, a, uD, uN, u_e, grad_u_e = self.convert_problem_data_to_expressions(
mesh, test_params, eps)
# Output to console the problem data
problem.output_problem_characteristics(
self.test_num, self.u_expr, self.grad_u_expr, self.f_expr,
self.A_expr, self.lambda_expr, self.a_expr,
self.uD_expr, self.domain, self.dim, mesh.num_cells(),
mesh.num_vertices(), test_params["v_approx_order"],
test_params["flux_approx_order"])
# Run the solver with a posteriori error control
# --------------------------------------------------------------------------------------------------------------#
t0_problem = time.clock()
while eps > self.eps:
mesh, V, VV, V_exact, VV_exact, H_div, boundary_facets, ds, dS \
= self.solve_problem_nd_t(mesh, boundary_facets, ds, dS,
V, V_exact, VV_exact, H_div,
u_e, f, A, invA, adjA, min_eig_A, lmbd, a, eps,
uD, uN,
C_FD, C_Ntr,
project_path, results_folder_name, test_params)
test_params['number_of_refinements'] = test_params[
'number_of_refinements'] + 2
#test_params['percentage_value'] = test_params['percentage_value'] + 0.1
eps = 1e-1 * eps
f, A, invA, adjA, min_eig_A, lmbd, a, uD, uN, u_e, grad_u_e = self.convert_problem_data_to_expressions(
mesh, test_params, eps)
print "\n\nmin_eig_A = ", min_eig_A
print "\n\nupdated eps = ", eps
print "\n\n"
t1_problem = time.clock()
print("time = %d" % (t1_problem - t0_problem))