Foam::RKCK45
4/5th Order Cash-Karp Runge-Kutta ODE solver.
References:
"A variable order Runge-Kutta method for initial value problems
with rapidly varying right-hand sides"
Cash, J.R.,
Karp, A.H.
ACM Transactions on Mathematical Software, vol. 16, 1990, pp. 201–222.
"Solving Ordinary Differential Equations I: Nonstiff Problems,
second edition",
Hairer, E.,
Nørsett, S.,
Wanner, G.,
Springer-Verlag, Berlin. 1993, ISBN 3-540-56670-8.
RKCK45.C