Numerical simulations of head-on collisions of water droplets at various Weber numbers have been performed. The Navier-Stokes equations are solved by using a finite-volume formulation on a fixed grid with a two-step projection method. Free surfaces are tracked by a technique called “volume-of-fluid”(VOF). A continuum surface force(CSF) model is used to calculate the surface tension force. Both ...

 A VOF-CSF model is developed to model slug flow in capillary channels  Non-uniform mesh is employed to reduce the simulation expenses  A moving reference frame is set moving along or opposite to the gas slug to eliminate the spurious current  The calculated liquid film thickness, slug velocity, and circulation flow ahead the gas slug are all agree very well with literatures Approach and Im...

This work presents two unsplit geometric VOF schemes that extend the two-dimensional cellwise conservative (CCU) scheme (Comminal et al. (2015) [49]) to three dimensions. The novelty of 3D-CCU lies in representation streaksurfaces donating regions by polyhedral surfaces whose vertices are calculated with 4th order Runge-Kutta scheme. Moreover, advected liquid volumes computed using a truncation...

This paper presents an all-Mach method for two-phase inviscid flow in the presence of surface tension. A modified version Hartens–Lax–van Leer Contact (HLLC) solver is developed and combined first time with a widely used volume-of-fluid (VoF) method: compressive interface capturing scheme arbitrary meshes (CICSAM). novel combination yields both HLLC shock as well accurate liquid–gas tracking ch...

We formulate a general multiphase model representing water-bubble mixture fluid and multi-component bubble populations. An enhanced 2-DV VOF model with a k− turbulence closure is used to model the mixture fluid phase. The bubble phase is governed by the advection-diffusion equations of the gas molar concentration and bubble intensity for groups of bubbles with different sizes. The initial bubbl...

Surface wave dynamics of vertical falling films under monochromatic-frequency flowrate-forcing perturbations is computed by the direct simulation of Navier–Stokes equations using the Volume of Fluid (VOF) method to track free surfaces and the Continuum Surface Force (CSF) model to account for dynamic boundary conditions at free surfaces. The numerical VOF–CSF model is completely formulated, and...