Iterative momentum relaxation for fast lattice-Boltzmann simulations

Lattice-Boltzmann simulations are often used for studying steady-state hydr odynamics. In these simulations, however, the complete time evolution start ing from some initial condition is redundantly computed due to the transien t nature of the scheme. In this article we present a refinement of body-for ce driven lattice-Boltzmann simulations that may reduce the simulation time significantly. This new technique is based on an iterative adjustment of t he local body-force. We validate this technique on three test cases, namely fluid flow around a spherical obstacle, flow in random fiber mats and flow in a static mixer reactor. (C) 2001 Elsevier Science B.V. All rights reser ved.