Effect of initial densities in the lattice Boltzmann model for non-ideal fluid with curved interface
| Autor: | Nobuyuki Oshima, Jia-ming Gong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Thermodynamic equilibrium Mechanical Engineering Computational Mechanics Lattice Boltzmann methods Perfect fluid Mechanics Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics 010101 applied mathematics Surface tension Classical mechanics Mechanics of Materials 0103 physical sciences Periodic boundary conditions Two-phase flow Boundary value problem 0101 mathematics Saturation (chemistry) |
| Zdroj: | Physics of fluids. 29(6):67108 |
| ISSN: | 1070-6631 |
| Popis: | The effect of initial densities in a free energy based two-phase-flow lattice Boltzmann method for non-ideal fluids with a curved interface was investigated in the present work. To investigate this effect, the initial densities in the liquid and gas phases coming from the saturation points and the equilibrium state were adopted in the simulation of a static droplet in an open and a closed system. For the purpose of simplicity and easier comparison, the closed system is fabricated by the implementation of the periodic boundary condition at the inlet and outlet of a gas channel, and the open system is fabricated by the implementation of a constant flux boundary condition at the inlet and a free-out boundary condition at the outlet of the same gas channel. By comparing the simulation results from the two types of initial densities in the open and closed systems, it is proven that the commonly used saturation initial densities setting is the reason for droplet mass and volume variation which occurred in the simulation, particularly in the open system with a constant flux boundary condition. Such problems are believed to come from the curvature effect of the surface tension and can be greatly reduced by adopting the initial densities in the two phases from equilibrium state. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|