m_af_advance::subr_feuler Interface Reference

Interface for a generic forward Euler scheme for time integration. More...

Private Member Functions
subroutine	subr_feuler (tree, dt, dt_stiff, dt_lim, time, s_deriv, n_prev, s_prev, w_prev, s_out, i_step, n_steps)

Detailed Description

Interface for a generic forward Euler scheme for time integration.

This method should advance the solution over a time dt. The method assumes that several copies are stored for the variables to be integrated. It should then operate on these different copies, which correspond to temporal states. In this way, higher-order time integration schemes can be constructed.

The meaning of the temporal states is as follows. For an equation y' = f(y), the method should perform: y_out = sum(w_prev * y_prev) + dt * f(y_deriv).

If the index of the variable y is i, then the index of y_out is i+s_out, etc.

In case of IMEX schemes, the time step dt_stiff (which is then not always equal to dt) should be used for stiff terms. The equation to be solved should be interpreted as:

d/dt y = F0(y) + F1(y)

where F0 is the non-stiff part and F1 is the stiff part

Definition at line 73 of file m_af_advance.f90.

Constructor & Destructor Documentation

subr_feuler()

subroutine m_af_advance::subr_feuler::subr_feuler ( type(af_t), intent(inout)  tree, real(dp), intent(in)  dt, real(dp), intent(in)  dt_stiff, real(dp), intent(inout)  dt_lim, real(dp), intent(in)  time, integer, intent(in)  s_deriv, integer, intent(in)  n_prev, integer, dimension(n_prev), intent(in)  s_prev, real(dp), dimension(n_prev), intent(in)  w_prev, integer, intent(in)  s_out, integer, intent(in)  i_step, integer, intent(in)  n_steps  )

private

Parameters

[in]	dt	Time step for regular terms
[in]	dt_stiff	Time step for stiff terms (IMEX)
[in,out]	dt_lim	Computed time step limit
[in]	time	Current time
[in]	s_deriv	State to compute derivatives from
[in]	n_prev	Number of previous states
[in]	s_prev	Previous states
[in]	w_prev	Weights of previous states
[in]	s_out	Output state
[in]	i_step	Step of the integrator
[in]	n_steps	Total number of steps

Definition at line 73 of file m_af_advance.f90.