GlobalFixedTimeStep.py

Go to the documentation of this file.

# This file is part of the ExaHyPE2 project. For conditions of distribution and 
# use, please see the copyright notice at www.peano-framework.org
from exahype2.solvers.PDETerms    import PDETerms
from exahype2.solvers.fv.SingleSweep import SingleSweep
 
import jinja2
 
from .kernels import create_compute_Riemann_kernel_for_MusclHancock
from .kernels import create_abstract_solver_declarations
from .kernels import create_abstract_solver_definitions
from .kernels import create_solver_declarations
from .kernels import create_solver_definitions
from .kernels import create_musclhancock_kernel_definitions
from .kernels import create_compute_Riemann_kernel_for_MUSCLHancock_dsl
 
from .kernels import SolverVariant
from .kernels import KernelVariant
 
from exahype2.solvers.fv.FixedTimeSteppingCodeSnippets import FixedTimeSteppingCodeSnippets
 
 
class GlobalFixedTimeStep( SingleSweep ):
  def __init__(self, 
    name, patch_size, unknowns, auxiliary_variables, min_volume_h, max_volume_h, normalised_time_step_size,
    flux=PDETerms.User_Defined_Implementation, 
    ncp=PDETerms.None_Implementation,
    eigenvalues=PDETerms.User_Defined_Implementation,
    boundary_conditions=PDETerms.User_Defined_Implementation,
    refinement_criterion=PDETerms.Empty_Implementation,
    initial_conditions=PDETerms.User_Defined_Implementation,
    source_term=PDETerms.None_Implementation,
    plot_grid_properties=False, pde_terms_without_state=False, 
    overlap=2, kernel_namespace="musclhancock"
  ):
    """
  
    time_step_size: Float
      This is the normalised time step size w.r.t. the coarsest admissible h value. If
      the code employs AMR on top of it and refines further, it will automatically 
      downscale the time step size accordingly. So hand in a valid time step size w.r.t.
      to max_volume_h.
  
    """
    super(GlobalFixedTimeStep,self).__init__(name, patch_size, overlap, unknowns, auxiliary_variables, min_volume_h, max_volume_h, plot_grid_properties, pde_terms_without_state, kernel_namespace="musclhancock") 
    
    self._normalised_time_step_size = normalised_time_step_size
 
    self._flux_implementation                 = PDETerms.None_Implementation
    self._ncp_implementation                  = PDETerms.None_Implementation
    self._eigenvalues_implementation          = PDETerms.None_Implementation
    self._source_term_implementation          = PDETerms.None_Implementation
    
    self._user_action_set_includes += """
#include "kernels/musclhancock.h"
"""
 
    self.set_implementation(flux=flux, 
      ncp=ncp, 
      eigenvalues=eigenvalues, 
      boundary_conditions=boundary_conditions, 
      refinement_criterion=refinement_criterion, 
      initial_conditions=initial_conditions, 
      source_term=source_term )
 
 
  def set_implementation(self,
    flux=None,ncp=None,
    eigenvalues=None,
    boundary_conditions=None,refinement_criterion=None,initial_conditions=None,source_term=None,
    memory_location         = None,
    use_split_loop          = False,
    additional_action_set_includes = "",
    additional_user_includes       = ""
  ):
    """
      If you pass in User_Defined, then the generator will create C++ stubs
      that you have to befill manually. If you pass in None_Implementation, it
      will create nop, i.e. no implementation or defaults. Any other string
      is copied 1:1 into the implementation. If you pass in None, then the
      set value so far won't be overwritten.
 
      Please note that not all options are supported by all solvers.
 
      This routine should be the very last invoked by the constructor.
    """
    if flux                 is not None:  self._flux_implementation                       = flux
    if ncp                  is not None:  self._ncp_implementation                        = ncp
    if eigenvalues          is not None:  self._eigenvalues_implementation                = eigenvalues
    if source_term          is not None:  self._source_term_implementation                = source_term
 
    create_musclhancock_kernel_definitions()
 
    #self._compute_kernel_call = create_compute_Riemann_kernel_for_MusclHancock(
    #  self._flux_implementation, self._ncp_implementation, self._source_term_implementation, 
    #  compute_max_eigenvalue_of_next_time_step=False,
    #  solver_variant = SolverVariant.WithVirtualFunctions,
    #  riemann_kernel_variant = RiemannKernelVariant.PatchWiseAoSHeap
    #)
 
    self._compute_kernel_call = create_compute_Riemann_kernel_for_MUSCLHancock_dsl(
      self._flux_implementation,
      self._ncp_implementation,
      self._source_term_implementation,
      compute_max_eigenvalue_of_next_time_step = False,
      solver_variant = SolverVariant.WithVirtualFunctions,
      kernel_variant = KernelVariant.PatchWiseAoS
    )
 
    self._compute_kernel_call_stateless = create_compute_Riemann_kernel_for_MUSCLHancock_dsl(
      self._flux_implementation,
      self._ncp_implementation,
      self._source_term_implementation,
      compute_max_eigenvalue_of_next_time_step = False,
      solver_variant = SolverVariant.Stateless,
      kernel_variant = KernelVariant.PatchWiseAoS
    )
 
    solver_code_snippets = FixedTimeSteppingCodeSnippets(self._normalised_time_step_size)
 
    self._abstract_solver_user_declarations  = create_abstract_solver_declarations(self._flux_implementation, self._ncp_implementation, self._eigenvalues_implementation, self._source_term_implementation, self._pde_terms_without_state)
    self._abstract_solver_user_declarations += solver_code_snippets.create_abstract_solver_user_declarations()
    self._abstract_solver_user_definitions   = create_abstract_solver_definitions(self._flux_implementation, self._ncp_implementation, self._eigenvalues_implementation, self._source_term_implementation, self._pde_terms_without_state)
    self._abstract_solver_user_definitions  += solver_code_snippets.create_abstract_solver_user_definitions()
 
    self._compute_time_step_size             = solver_code_snippets.create_compute_time_step_size()
    self._compute_new_time_step_size         = solver_code_snippets.create_compute_new_time_step_size()
 
    self._solver_user_declarations           = create_solver_declarations(self._flux_implementation, self._ncp_implementation, self._eigenvalues_implementation, self._source_term_implementation, self._pde_terms_without_state)
    self._solver_user_definitions            = create_solver_definitions(self._flux_implementation, self._ncp_implementation, self._eigenvalues_implementation, self._source_term_implementation, self._pde_terms_without_state)
 
    self._start_time_step_implementation     = solver_code_snippets.create_start_time_step_implementation()
    self._finish_time_step_implementation    = solver_code_snippets.create_finish_time_step_implementation()
    self._constructor_implementation         = solver_code_snippets.create_abstract_solver_constructor_statements()
 
    super(GlobalFixedTimeStep,self).set_implementation(boundary_conditions, refinement_criterion, initial_conditions, memory_location, use_split_loop, additional_action_set_includes, additional_user_includes)
 
  @property
  def user_action_set_includes(self):
    return super(GlobalFixedTimeStep, self).user_action_set_includes + """
#include "kernels/musclhancock.h"
"""