Problem
**************

.. automodule:: freshkiss3d.problem

.. currentmodule:: freshkiss3d.problem

.. autoclass:: freshkiss3d.Problem
   :members:

.. note::
   The default ``numerical_parameters`` dictionary include the following keys and values:

   * ``'space_second_order':False``,                second order space scheme 
   * ``'ipres':False``,                             alternative pressure source terms formulation
   * ``'cfl_adjuster':0.9``,                        CFL coefficient
   * ``'beta':0.3333``,                             beta slope limiter coefficient (second order)
   * ``'velocity_correction':False``,               velocity corrections in reconstructions (second order)
   * ``'tracer_correction':True``,                  tracer corrections in reconstructions (second order)
   * ``'flux_type':1``,                             fluxes with chi1(1), chi1b(2) or chi2(3) kinetic functions
   * ``'implicit_exchanges':True``,                 implicit scheme for exchanges between layers
   * ``'implicit_vertical_viscosity':True``,        implicit scheme for vertical viscosity
   * ``'implicit_vertical_diffusivity':True``,      implicit scheme for vertical tracer diffusivity
   * ``'vertical_velocity_centered_scheme':False``, vertical velocity centered scheme

.. note::
   The default ``physical_parameters`` dictionary include the following keys and values:

   * ``'friction_law':'Navier'``
   * ``'friction_coeff':0.0``
   * ``'horizontal_viscosity':0.0``
   * ``'vertical_viscosity':0.0``
   * ``'variable_density':False``,                  variable density 
   * ``'variable_density_model':'boussinesq'``,     variable density model: 'boussinesq' or 'ns-fourier'
   * ``'user_defined_state_law'``:False,            user defined stat law (freshkiss3d/core/state_laws_user.pyx)
   * ``'ies1980_default_P0':1.``,                   default pressure in bar used in IES1980
   * ``'ies1980_default_T0':10.``,                  default temperature in °C used in IES1980
   * ``'ies1980_default_S0':0.``,                   default salinity in g/L used in IES1980
   * ``'nsf_diffusion':False``,                     thermal diffusion in NSF
   * ``'nsf_thermal_conductivity':0.6``,            thermal conductivity used in NSF diffusion 
   * ``'rho_suspension':1001``,

.. include:: generated/freshkiss3d.Problem.examples
.. raw:: html

    <div style='clear:both'></div>