Surface = Expression('- x[0] * tan(alpha)',
alpha=alpha,
element=model.Q.ufl_element())
Bed = Expression('- x[0] * tan(alpha) - 1000.0',
alpha=alpha,
element=model.Q.ufl_element())
Beta2 = Expression('1000 + 1000 * sin(2*pi*x[0]/L) * sin(2*pi*x[1]/L)',
alpha=alpha,
L=L,
element=model.Q.ufl_element())
model.set_geometry(Surface, Bed, deform=True)
model.set_parameters(IceParameters())
model.initialize_variables()
nonlin_solver_params = default_nonlin_solver_params()
nonlin_solver_params['newton_solver']['linear_solver'] = 'mumps'
config = {
'mode': 'steady',
'output_path': './results_stokes_L' + str(L) + '/',
'wall_markers': [],
'periodic_boundary_conditions': True,
't_start': None,
't_end': None,
'time_step': None,
'log': True,
'coupled': {
'on': False,
'inner_tol': 0.0,
'max_iter': 2
Surface = dbm.get_spline_expression('h')
Bed = dbm.get_spline_expression('b')
SurfaceTemperature = dsr.get_spline_expression('T')
BasalHeatFlux = dfm.get_spline_expression('q_geo')
adot = dsr.get_spline_expression('adot')
U_observed = dmg.get_spline_expression('v_mag')
model = model.Model()
model.set_geometry(Surface, Bed)
model.set_mesh(mesh, flat_mesh=flat_mesh, deform=True)
model.set_parameters(pc.IceParameters())
model.initialize_variables()
# specifify non-linear solver parameters :
nonlin_solver_params = default_nonlin_solver_params()
nonlin_solver_params['newton_solver']['relaxation_parameter'] = 0.7
nonlin_solver_params['newton_solver']['relative_tolerance'] = 1e-3
nonlin_solver_params['newton_solver']['absolute_tolerance'] = 1e2
nonlin_solver_params['newton_solver']['maximum_iterations'] = 20
nonlin_solver_params['newton_solver']['error_on_nonconvergence'] = False
nonlin_solver_params['newton_solver']['linear_solver'] = 'mumps'
nonlin_solver_params['newton_solver']['preconditioner'] = 'default'
parameters['form_compiler']['quadrature_degree'] = 2
config = { 'mode' : 'steady',
't_start' : None,
't_end' : None,
'time_step' : None,
'output_path' : out_dir,
'wall_markers' : [],
'wall_markers' : [],
'periodic_boundary_conditions' : True,
't_start' : None,
't_end' : None,
'time_step' : None,
'log' : True,
'coupled' :
{
'on' : False,
'inner_tol' : 0.0,
'max_iter' : 1
},
'velocity' :
{
'on' : True,
'newton_params' : default_nonlin_solver_params(),
'viscosity_mode' : 'isothermal',
'b_linear' : None,
'use_T0' : False,
'T0' : None,
'A0' : 1e-16,
'beta2' : Beta2(),
'r' : 0.0,
'E' : 1,
'approximation' : 'fo',
'boundaries' : None
},
'enthalpy' :
{
'on' : False,
'use_surface_climate' : False,
