  We compute the stationary profiles of a coherent beam of Bose condensed atoms
propagating through a guide. Special emphasis is put on the effect of an
obstacle present on the trajectory of the beam. The obstacle considered (such
as a bend in the guide, or a laser field perpendicular to the beam) results in
a repulsive or an attractive potential acting on the condensate. Different
behaviors are observed when varying the beam velocity (with respect to the
speed of sound), the size of the obstacle (relative to the healing length) and
the intensity and sign of the potential. The existence of bound states of the
condensate is also considered.
