  The hydrodynamic attractor is a concept that describes universal
equilibration behavior in which systems lose microscopic details before
hydrodynamics becomes applicable. We propose a setup to observe hydrodynamic
attractors in ultracold atomic gases, taking advantage of the fact that driving
the two-body $s$-wave scattering length causes phenomena equivalent to
isotropic fluid expansions. We specifically consider two-component fermions
with contact interactions in three dimensions and discuss their dynamics under
a power-law drive of the scattering length in a uniform system, employing a
hydrodynamic relaxation model. We analytically solve their dynamics and find
the hydrodynamic attractor solution. Our results establish the cold atom
systems as a new platform for exploring hydrodynamic attractors.
