  We present an a priori derivation of the force scheme for lattice Boltzmann
method based on kinetic theoretical formulation. We show that the discrete
lattice effect, previously eliminated a posteriori in BGK collision model, is
due to first-order space-time discretization and can be eliminated generically
for a wide range of collision models with second-order space-time
discretization. Particularly, the force scheme for the recently developed
spectral multiple-relaxation-time (SMRT) collision model is obtained and
numerically verified.
