variables_navier Module Reference

Define variables (time step, schemes, solvers, etc.) associated to the Navier-Stokes equations.

Variables
integer	navier_contact_line_model = navier_contact_line_model_none
	The contact line model.
logical	navier_has_slip_velocity = .false.
logical	velocity_is_enforced = .false.
logical	is_pressure_increment_matrix_not_invertible = .false.
	Boolean to check if pressure increment matrix is invertible.
integer	pressure_increment_invertible_matrix_method = penalization
	If matrix is not invertible, 2 methods can be used to solve the linear system.
integer	pressure_increment_penalized_cell = back_bottom_left_corner
	If matrix is not invertible, next integer sets the corner that will be penalized to 0.
Logical list to activate terms of the equation
logical	is_compressible = .false.
	Compressible flow.
logical	compressible_has_predict_density = .true.
logical	compressible_has_update_density_eos = .true.
logical	compressible_has_speed_of_sound_formulation = .false.
logical	is_boussinesq_approximation = .false.
	Boussinesq approximation.
logical	momentum_has_source_term = .false.
	Has momentum source term?
logical	pressure_has_source_term = .false.
	Has pressure source term.
logical	continuity_has_source_term = .false.
	Has continuity source term.
logical	momentum_has_linear_term = .false.
	Has momentum linear term?
logical	navier_has_nonlinear_momentum_term = .true.
	Has non linear momentum term?
logical	navier_has_stress_term = .true.
	Has stress (diffusion) term?
logical	navier_has_momentum_equation = .true.
	Has momentum equation.
logical	navier_has_div_u_advection_term = .true.
	Substract \( u \cdot div(u) \) for pure advection (incompressible flows)
logical	navier_has_brinkman_term = .false.
	Has Brinkman term?
logical	navier_has_carman_kozeny_term = .false.
	Has Carman-Kozeny term?
logical	navier_has_gravity_term = .false.
	Has gravity term?
logical	navier_has_surface_tension_term = .false.
	Has surface tension term?
logical	navier_has_grad_div_term = .false.
	Has \( \nabla(\nabla \cdot \mathbf{u}) \) term?
logical	navier_has_temporal_term = .true.
	Has temporal term?
logical	navier_has_immersed_boundaries = .false.
	Flag to enable immersed boundaries for the Navier-Stokes equation.
logical	navier_has_pressure_term = .true.
	Flag to disable pressure term.
logical	navier_has_viscous_term = .true.
	Flag to disable viscous term.
Immersed boundaries
integer, dimension(:), allocatable	navier_isd_target
	List of enabled immersed boundaries for the Νavier-Stokes equation.
integer	n_ibc_velocity = 0
	Number of immersed boundaries enabled for the Navier-Stokes equation.
logical	navier_ib_has_one_sided_inner_discretization
	One sided discretization close to immersed boundaries.
integer, dimension(:), allocatable	navier_ib_inner_discretization_order
Additional physical information
double precision, dimension(3)	gravity_vector = 0d0
	Gravity vector.
logical	navier_enable_driving_pressure = .false.
	Driving pressure (for single phase flows)
integer	navier_gravity_temporal_method = time_method_explicit
	Gravity temporal method,.
double precision	surface_tension_coeff = 0d0
	Surface tension.
integer	navier_surface_tension_temporal_method = time_method_implicit
	Surface tension temporal method,.
logical	navier_surface_tension_is_sharp = .false.
Variables associated to the time discretization
double precision	navier_time_step = 0d0
	Current Time step Current Time step.
double precision	navier_time_step_n = 0d0
	Previous time step.
integer	navier_time_order_discretization = time_order_1
	Time order discretization.
integer	navier_nonlinear_explicit_time_order_discretization = time_order_1
	Time order discretization for explicit schemes.
logical	navier_use_explicit_terms_accumulator = .false.
	A switch for when to use explicit accumulator.
Boundary condition variables
type(t_boundary_condition_face)	navier_boundary_condition
	Boundary condition.
type(t_boundary_condition)	pressure_increment_boundary_condition
type(t_boundary_condition)	pressure_boundary_condition
type(t_boundary_condition)	density_boundary_condition
Initializer
class(t_vector_initializer), pointer	velocity_initializer => null()
	Initial condition initializer.
class(t_scalar_initializer), pointer	density_initializer => null()
	density initializer
class(t_scalar_initializer), pointer	pressure_initializer => null()
	Pressure initializer.
class(t_scalar_initializer), pointer	pressure_source_term_initializer => null()
	Pressure source term initializer.
class(t_scalar_initializer), pointer	continuity_source_term_initializer => null()
	Continuity source term initializer.
class(t_face_bc_initializer), pointer	velocity_bc_initializer => null()
	Boundary conditions initializer.
class(t_cell_bc_initializer), pointer	density_bc_initializer => null()
	density Boundary conditions initializer
class(t_navier_ibc_initializer_item), dimension(:), allocatable	velocity_ibc_initializer
	Immersed boundary conditions.
class(t_vector_initializer), pointer	momentum_source_term_initializer => null()
	Source term initializer.
class(t_vector_initializer), pointer	momentum_linear_term_initializer => null()
	Linear term initializer.
Hydrostatic pressure initialization
logical	navier_has_hydrostatic_pressure_initialization = .false.
	Flag to enable the initialization of hydrostatic pressure.
double precision	navier_hydrostatic_solver_tolerance = 1d-15
	Tolerance of the hydrostatic pressure solver.
integer	navier_hydrostatic_solver_max_iter = 100
	Maximum number of iterations of the hydrostatic pressure solver.
Conservative inertia method
logical	is_navier_momentum_preserving_method = .false.
	Enable conservative method.
integer	navier_momentum_preserving_method_prediction = navier_momentum_preserving_method_prediction_on_cells
Velocity pressure coupling method
logical	navier_is_disable_velocity_pressure_method = .false.
	Disable velocity pressure method?
integer	navier_velocity_pressure_method = incremental_pressure_correction
	Velocity pressure method choice.
logical	is_pressure_increment_poisson_dodd_approximation = .false.
	Pressure increment poisson approximation method choice (Dodd and/or Frantzis)
logical	is_pressure_increment_poisson_frantzis_approximation = .false.
logical	is_pressure_increment_poisson_equation_bc_time_dependent = .false.
	Boundary condition types for the pressure increment Poisson equation are constant (values can change)
integer	poisson_approximation_iteration_start = 5
	Number of time iterations to skip.
logical	navier_do_project_initial_velocity = .false.
	Initial velocity projection.
integer	pressure_scheme = cell_centered_o2_diffusion_scheme
	Implicit associated scheme.
integer	pressure_advection_scheme = pressure_advection_scheme_uncentered_o2
	Pressure advection scheme (compressible flow only)
integer	density_advection_scheme = density_advection_scheme_weno5
	density advection scheme (compressible flow only)
logical	subtract_mean_pressure_to_pressure = .false.
	Substract integrale of pressure to pressure field.
integer	navier_diffusion_term_discretization_type = implicit_discretization
	Diffusion term discretization type (implicit or explicit)
integer	navier_diffusion_term_scheme = navier_diffusion_o2_centered_scheme
	Diffusion term scheme.
integer	navier_diffusion_explicit_time_order_discretization = time_order_1
	Time order discretization for explicit schemes.
Variables associated to the discretization of the advection term
integer	navier_nonlinear_term_discretization_type = implicit_discretization
	Nonlinear term discretization type (implicit or explicit)
integer	navier_nonlinear_term_scheme = navier_nonlinear_centered_o2_scheme
	Nonlinear term scheme.
integer	navier_nonlinear_term_splitting_scheme = navier_lie_trotter_splitting
	Nonlinear term: Splitting Method for Lax-Wendroff TVD Superbee.
double precision, dimension(3)	navier_splitting_time_coeff = 1d0
	Operator splitting method time step modifier.
logical	is_navier_specify_nonlinear_term_scheme_tsf = .false.
	Specify a CFL factor for explicit sub iterations (tsf stand for temporal_stability_factor)
double precision	navier_nonlinear_term_scheme_temporal_stability_factor = -1d0
	CFL used for explicit sub iterations (if is_navier_specify_nonlinear_term_scheme_temporal_stability_factor, otherwise, using default values)
logical	navier_nonlinear_term_dir_split = .false.
	Advection term: directional splitting option.
logical	is_navier_fully_explicit = .false.
	Fully explicit.
type(t_fv_flux), parameter	default_navier_nonlinear_explicit_flux = default_flux_godunov
	Fluxes type The default explicit nonlinear term flux.
type(t_fv_flux)	navier_nonlinear_explicit_flux = default_navier_nonlinear_explicit_flux
	Fluxes type The effective explicit nonlinear term flux.
Miscellaneous variables
logical	navier_has_ghost_boundary_cells = .false.
	Ghost boundary cell choice.
logical	pressure_has_ghost_boundary_cells = .false.
type(t_face_stencil)	navier_stencil
	Stencils.
type(t_cell_stencil)	pressure_stencil
integer	navier_enforced_stencil = -1
	Enforced stencil.
integer	pressure_increment_enforced_stencil = -1
logical	pressure_has_imposed_value = .false.
	Has imposed value (pressure)?
logical	pressure_has_imposed_value_reference_value = .false.
double precision, dimension(3)	pressure_imposed_point = [0d0, 0d0, COORD_Z_2D]
	Imposed value.
double precision	pressure_imposed_value = huge(0d0)
Linear system solver variables
type(t_face_ls_map)	navier_ls_map
	Mapping variables.
type(t_ls_map)	pressure_ls_map
class(t_linear_solver), allocatable	momentum_solver
	Linear system solver.
class(t_linear_solver), allocatable	pressure_solver
class(t_linear_solver), allocatable	ibc_velocity_extrapolation_solver
	Solver for the extrapolation step of the Navier-Stokes resolution.
Global divergence
double precision	l2_divergence
	Divergence after correction.
double precision	linf_divergence
double precision	prediction_l2_divergence
	Predicted divergence (before correction)
double precision	prediction_linf_divergence
Refined velocity method
integer	ui_refined_grid_velocity_method
	Refined grid method for the velocity interpolation/reconstruction.

Variable Documentation

navier_gravity_temporal_method

integer variables_navier::navier_gravity_temporal_method = time_method_explicit

See also

enum_time_method_discretization

navier_surface_tension_temporal_method

integer variables_navier::navier_surface_tension_temporal_method = time_method_implicit

See also

enum_time_method_discretization