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timestepper.cpp
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Wed, Oct 2, 13:12
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Fri, Oct 4, 13:12 (2 d)
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rSPECMICP SpecMiCP / ReactMiCP
timestepper.cpp
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#include "timestepper.hpp"
#include "reactive_transport_solver_structs.hpp"
namespace
specmicp
{
namespace
reactmicp
{
namespace
solver
{
scalar_t
Timestepper
::
next_timestep
(
scalar_t
dt_done
,
ReactiveTransportReturnCode
return_code
,
index_t
nb_iterations
)
{
if
(
return_code
<=
ReactiveTransportReturnCode
::
NotConvergedYet
)
{
return
get_options
().
decrease_failure
*
dt_done
;
}
// previous timestep is correct
m_total
+=
dt_done
;
m_average
.
add_point
(
nb_iterations
);
scalar_t
proposed_dt
=
dt_done
;
// If the error is minimized we increase the timestep
if
(
return_code
==
ReactiveTransportReturnCode
::
ErrorMinimized
)
{
proposed_dt
*=
get_options
().
increase_error_minimization
;
}
else
// Increase or decrease the timestep to reach the number of iteration target range
{
if
(
m_average
.
current_value
()
<=
get_options
().
iteration_lower_target
)
{
proposed_dt
*=
get_options
().
increase_factor
;
}
else
if
(
m_average
.
current_value
()
>
get_options
().
iteration_upper_target
)
{
proposed_dt
*=
get_options
().
decrease_factor
;
}
}
// Check that the total target is not exceeded
if
(
m_total
+
proposed_dt
>
m_total_target
)
{
proposed_dt
=
m_total_target
-
m_total
;
}
// Check that the timestep is inside the bounds
if
(
proposed_dt
<
get_options
().
lower_bound
)
{
proposed_dt
=
get_options
().
lower_bound
;
}
else
if
(
proposed_dt
>
get_options
().
upper_bound
)
{
proposed_dt
=
get_options
().
upper_bound
;
}
return
proposed_dt
;
}
}
// end namespace solver
}
// end namespace reactmicp
}
// end namespace specmicp
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