  A new formulation of second-order viscous hydrodynamics, based on an
expansion around a locally anisotropic momentum distribution, is presented. It
generalizes the previously developed formalism of anisotropic hydrodynamics
(aHydro) to include a complete set of dissipative currents for which equations
of motion are derived by solving the Boltzmann equation in the 14-moment
approximation. By solving the vaHydro equations for a transversally
homogeneous, longitudinally boost-invariant system ((0+1)-dimensional
expansion) and comparing with the exact solution of the Boltzmann equation in
relaxation-time approximation we show that vaHydro performs much better than
all other known second-order viscous hydrodynamic approximations.
