The capillary time-step constraint is the dominant limitation on applicable in many simulations of interfacial flows with surface tension and, consequently, governs execution time these simulations. We propose a fully-coupled pressure-based algorithm based an algebraic Volume-of-Fluid (VOF) method conjunction implicit linearised treatment that can breach constraint. advection interface solved t...

A computational study of partial cavitation over axisymmetric bodies is presented using two numerical methods. The first method is based on the VOF technique where transient 2D Navier-Stokes equations are solved along with an equation to track the cavity interface. Next, the steady boundary element method (BEM) based on potential flow theory is presented. The results of the two methods for a di...

Many thermohydraulic issues about the safety of light water reactors are related to complicated two-phase flow phenomena. In these phenomena, computational fluid dynamics (CFD) analysis using volume (VOF) method causes numerical diffusion generated by first-order upwind scheme used in convection term fraction equation. Thus, this study, we focused on an interface compression (IC) for such a VOF...

In this dissertation, we present a numerical method for tracking surfactants on an interface in multiphase flow, along with applications of the method to two physical problems. We also present an extension of our method to track charged droplets. Our method combines a traditional volume of fluid (VOF) method with marker tracking. After describing this method in detail, we present a series of te...

The rise and deformation of a gas bubble in an otherwise stationary liquid contained in a closed, right vertical cylinder is investigated using a modified volume-of-fluid (VOF) method incorporating surface tension stresses. Starting from a perfectly spherical bubble which is initially at rest, the upward motion of the bubble in a gravitational field is studied by tracking the liquid–gas interfa...

Developing functional closure models for all the subgrid scale (SGS) physics in large eddy simulation (LES) of turbulent two-phase flows is yet a challenging task due to complicated turbulence-interface interactions. Our recent study (Saeedipour and Schneiderbauer, 2019) has revisited classical viscosity concept proposed new approach include surface tension into viscosity. It revealed an a-prio...

A numerical study, using the volume-of-fluid method (VOF), has been made of core-annular flow in a curved pipe. We investigated two cases: core-annular flow in a 90◦ bend and in a 180◦ return bend. To verify our numerical method we first compared our results for a singlephase flow in a 90◦ bend with numerical results and experimental data given in the literature. The agreement was good. Thereaf...