For the discretization of the time derivatives different schemes can
be used. An explicit first order Euler scheme, a second order
explicit Adams-Bashforth and a second order explicit Runge-Kutta
scheme can be employed for all time derivatives, for the time
discretization in equations () and (
) in addition
a Runge-Kutta-Method of third order is available. By default the
first order Euler-scheme is used, for information about how to apply
another method, please refer to section
.