  We explore the role of torsion as source of spin current in strongly
interacting conformal fluids using holography. We establish the constitutive
relations of the basic hydrodynamic variables, the energy-momentum tensor and
the spin current based on the classification of the spin sources in irreducible
Lorentz representations. The fluids we consider are assumed to be described by
the five dimensional Lovelock-Chern-Simons gravity with independent vielbein
and spin connection. We construct a hydrodynamic expansion that involves the
stress tensor and the spin current and compute the corresponding one-point
functions holographically. As a byproduct we find a class of interesting
analytic solutions to the Lovelock-Chern-Simons gravity, including blackholes,
by mapping the equations of motion into non-linear algebraic constraints for
the sources. We also derive a Lee-Wald entropy formula for these blackholes in
Chern-Simons theories with torsion. The blackhole solutions determine the
thermodynamic potentials and the hydrodynamic constitutive relations in the
corresponding fluid on the boundary. We observe novel spin induced transport in
these holographic models: a dynamical version of the Barnett effect where
vorticity generates a spin current and anomalous vortical transport transverse
to a vector-like spin source.
