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  • 1.
    Amberg, Gustav
    KTH.
    Solidification microstructure, dendrites and convection2004In: Phase Change With Convection: Modelling And Validation / [ed] Kowalewski, TA., Gobin, D., Wien: Springer, 2004, p. 1-53Conference paper (Refereed)
  • 2.
    Do-Quang, Minh
    et al.
    KTH.
    Amberg, Gustav
    KTH.
    Brethouwer, Gert
    KTH.
    Johansson, Arne V.
    KTH.
    Simulation of finite-size fibers in turbulent channel flows2014In: Physical Review E. Statistical, Nonlinear, and Soft Matter Physics, ISSN 1539-3755, E-ISSN 1550-2376, Vol. 89, no 1, article id 013006Article in journal (Refereed)
    Abstract [en]

    The dynamical behavior of almost neutrally buoyant finite-size rigid fibers or rods in turbulent channel flow is studied by direct numerical simulations. The time evolution of the fiber orientation and translational and rotational motions in a statistically steady channel flow is obtained for three different fiber lengths. The turbulent flow is modeled by an entropy lattice Boltzmann method, and the interaction between fibers and carrier fluid is modeled through an external boundary force method. Direct contact and lubrication force models for fiber-fiber interactions and fiber-wall interaction are taken into account to allow for a full four-way interaction. The density ratio is chosen to mimic cellulose fibers in water. It is shown that the finite size leads to fiber-turbulence interactions that are significantly different from earlier reported results for point like particles (e.g., elongated ellipsoids smaller than the Kolmogorov scale). An effect that becomes increasingly accentuated with fiber length is an accumulation in high-speed regions near the wall, resulting in a mean fiber velocity that is higher than the mean fluid velocity. The simulation results indicate that the finite-size fibers tend to stay in the high-speed streaks due to collisions with the wall. In the central region of the channel, long fibers tend to align in the spanwise direction. Closer to the wall the long fibers instead tend to toward to a rotation in the shear plane, while very close to the wall they become predominantly aligned in the streamwise direction.

  • 3.
    Lācis, U.
    et al.
    KTH.
    Johansson, P.
    KTH.
    Fullana, T.
    Sorbonne Université and CNRS, Paris, France.
    Hess, B.
    KTH.
    Amberg, Gustav
    Södertörn University. KTH.
    Bagheri, S.
    KTH.
    Zaleski, S.
    KTH; Sorbonne Université and CNRS, Paris, France.
    Steady moving contact line of water over a no-slip substrate: Challenges in benchmarking phase-field and volume-of-fluid methods against molecular dynamics simulations2020In: The European Physical Journal Special Topics, ISSN 1951-6355, E-ISSN 1951-6401, Vol. 229, no 10, p. 1897-1921Article in journal (Refereed)
    Abstract [en]

    The movement of the triple contact line plays a crucial role in many applications such as ink-jet printing, liquid coating and drainage (imbibition) in porous media. To design accurate computational tools for these applications, predictive models of the moving contact line are needed. However, the basic mechanisms responsible for movement of the triple contact line are not well understood but still debated. We investigate the movement of the contact line between water, vapour and a silica-like solid surface under steady conditions in low capillary number regime. We use molecular dynamics (MD) with an atomistic water model to simulate a nanoscopic drop between two moving plates. We include hydrogen bonding between the water molecules and the solid substrate, which leads to a sub-molecular slip length. We benchmark two continuum methods, the Cahn–Hilliard phase-field (PF) model and a volume-of-fluid (VOF) model, against MD results. We show that both continuum models reproduce the statistical measures obtained from MD reasonably well, with a trade-off in accuracy. We demonstrate the importance of the phase-field mobility parameter and the local slip length in accurately modelling the moving contact line.

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