title: Hydrodynamic correlations in shear flow: Multiparticle-collision-dynamics simulation study.
abstract: The nonequilibrium hydrodynamic correlations of a multiparticle-collision-dynamics (MPC) fluid in shear flow are studied by analytical calculations and simulations. The Navier-Stokes equations for a MPC fluid are linearized about the shear flow and the hydrodynamic modes are evaluated as an expansion in the wave vector. The shear-rate dependence and anisotropy of the transverse and longitudinal velocity correlations are analyzed. We demonstrate that hydrodynamic correlations in shear flow are anisotropic, specifically, the two transverse modes are no longer identical. In addition, our simulations reveal the directional dependence of the frequency and attenuation of the longitudinal velocity correlation function. Furthermore, the velocity autocorrelation functions of a tagged fluid particle in shear flow are determined. The simulation results for various hydrodynamic correlations agree very well with the theoretical predictions.
authors.affiliation: Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich 52425, Germany.
authors.forename: Anoop
authors.initials: A
authors.lastname: Varghese
authors.affiliation: Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich 52425, Germany.
authors.forename: Chien-Cheng
authors.initials: CC
authors.lastname: Huang
authors.affiliation: Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich 52425, Germany.
authors.forename: Roland G
authors.initials: RG
authors.lastname: Winkler
authors.affiliation: Institute of Complex Systems and Institute for Advanced Simulation, Forschungszentrum Jülich, Jülich 52425, Germany.
authors.forename: Gerhard
authors.initials: G
authors.lastname: Gompper