The model described in this document is the three-dimensional, hydrostatic primitive-equation Regional Ocean Modeling System. It is a free-surface, finite-difference circulation model, formulated in a vertical terrain-following sigma-coordinate. The horizontal discretization is by an orthogonal curvilinear Arakawa-C grid. (taken from He and Wilkin 2006)
Perfect restart uses multiple time steps in order to calculate the derivatives (unlike a single time step initialization)
For new solutions, or to use analytical initial conditions, must set NRREC == 0
(in addition to compiling with #define ANA_INITIAL
in the cpp header file.
To restart, if you used #define ANA_INITIAL
then you need to recompile with #undef ANA_INITIAL
.