15.21. Acoustic wave

# define ACOUSTIC

CPP options:

# undef  MPI
# define NBQ
# ifdef NBQ
#  undef  NBQ_PRECISE
#  define NBQ_PERF
# endif
# undef  UV_VIS2
# define SOLVE3D
# define NEW_S_COORD
# define ANA_GRID
# define ANA_INITIAL
# define ANA_SMFLUX
# define ANA_STFLUX
# define ANA_SRFLUX
# define ANA_BTFLUX
# define NO_FRCFILE