Assessing moment-based boundary conditions for the lattice Boltzmann equation: A study of dipole-wall collisions

•Implementation of boundary conditions in lattice Boltzmann methods through purely hydrodynamic moments. This is conceptually and computationally different from the standard approach of applying (sometimes unphysical) rules to the velocity distribution functions, or using ad-hoc closures approximations.•Very detailed validation of the method, including careful comparisons with data from spectral simulations, and convergence studies.•Comparisons with bounce-back, showing that the moment-based approach computes results in better agreement with spectral results than bounce-back.•Method shown to be second-order accurate, and the accuracy is retained for complex and high Reynolds number flows.•Detailed study and predications of normal and oblique dipole wall collisions at Reynolds number up to 10,000, helps understand the complex vorticity distribution, particularly in the vicinity of concave corners.