  Transport of an inertial particle advected by a two-dimensional steady
laminar flow is numerically investigated in the presences of a constant force
and a periodic potential. Within particular parameter regimes this system
exhibits absolute negative mobility, which means that the particle can travel
in a direction opposite to the constant force. It is found that the profile of
the periodic potential plays an important role in the nonlinear response
regime. Absolute negative mobility can be drastically enhanced by applying
appropriate periodic potential, the parameter regime for this phenomenon
becomes larger and the amplitude of negative mobility grows exceedingly large
(giant negative mobility). In addition, giant positive mobility is also
observed in the presence of appropriate periodic potential.
