A Characteristic Boundary Condition for Multispeed Lattice Boltzmann Methods

We present the development of a non-reflecting boundary condition, based on the Local One-Dimensional Inviscid (LODI) approach, for Lattice Boltzmann Mod-els working with multi-speed stencils.We test and evaluate the LODI implementation with numerical benchmarks, show-ing significant accuracy gains with respect to the results produced by a simple zero -gradient condition. We also implement a simplified approach, which allows handling the unknown distribution functions spanning several layers of nodes in a unified way, still preserving a comparable level of accuracy with respect to the standard formula-tion.