We report about a numerical algorithm based on the lattice Boltzmann method and its applications for simulations of turbulent convection in multi-phase flows.We discuss the issue of’latent heat’definition using a th...We report about a numerical algorithm based on the lattice Boltzmann method and its applications for simulations of turbulent convection in multi-phase flows.We discuss the issue of’latent heat’definition using a thermodynamically consistent pseudo-potential on the lattice.We present results of numerical simulations in 3D with and without boiling,showing the distribution of pressure,density and temperature fluctuations inside a convective cell.展开更多
We study the static and dynamical behavior of the contact line between two fluids and a solid plate by means of the Lattice Boltzmann method(LBM).The different fluid phases and their contact with the plate are simulat...We study the static and dynamical behavior of the contact line between two fluids and a solid plate by means of the Lattice Boltzmann method(LBM).The different fluid phases and their contact with the plate are simulated by means of standard Shan-Chen models.We investigate different regimes and compare the multicomponent vs.the multiphase LBM models near the contact line.A static interface profile is attained with the multiphase model just by balancing the hydrostatic pressure(due to gravity)with a pressure jump at the bottom.In order to study the same problem with the multicomponent case we propose and validate an idea of a body force acting only on one of the two fluid components.In order to reproduce results matching an infinite bath,boundary conditions at the bath side play a key role.We quantitatively compare open and wall boundary conditions and study their influence on the shape of the meniscus against static and lubrication theory solution.展开更多
文摘We report about a numerical algorithm based on the lattice Boltzmann method and its applications for simulations of turbulent convection in multi-phase flows.We discuss the issue of’latent heat’definition using a thermodynamically consistent pseudo-potential on the lattice.We present results of numerical simulations in 3D with and without boiling,showing the distribution of pressure,density and temperature fluctuations inside a convective cell.
基金funded by FOM(Foundation for Fundamental Research on Matter).
文摘We study the static and dynamical behavior of the contact line between two fluids and a solid plate by means of the Lattice Boltzmann method(LBM).The different fluid phases and their contact with the plate are simulated by means of standard Shan-Chen models.We investigate different regimes and compare the multicomponent vs.the multiphase LBM models near the contact line.A static interface profile is attained with the multiphase model just by balancing the hydrostatic pressure(due to gravity)with a pressure jump at the bottom.In order to study the same problem with the multicomponent case we propose and validate an idea of a body force acting only on one of the two fluid components.In order to reproduce results matching an infinite bath,boundary conditions at the bath side play a key role.We quantitatively compare open and wall boundary conditions and study their influence on the shape of the meniscus against static and lubrication theory solution.
