New algorithm for the numerical simulation of two-phase stratified gas–liquid flow and its application for analyzing the Kelvin–Helmholtz instability criterion with respect to wavelength effect

Numerical modeling of slug flow initiation in a horizontal channels using a two-fluid model

“…This question can be answered by noting that the waves in the second zone are short waves instigated by the K-H instability at the stratified two-phase flow, which decrease as the wave length decreases. This case has been discussed previously by Ansari and Shokri (2007), and the conclusions are shown in Fig. 14.…”

A study on the numerical stability of the two-fluid model near ill-posedness

“…Another approach is to simplify the governing system to only two equations for the liquid phase volume fraction and liquid velocity and neglect the transient terms in the gas mass and momentum equations (Barnea and Taitel, 1994;Chan and Banerjee, 1981). The pressure correction scheme (Patankar, 1980) has recently been implemented by various researchers (Issa and Woodburn, 1998;Issa and Kempf, 2003;Ansari and Shokri, 2007) for solving the standard two-fluid model.…”

Single-Phase and Two-Phase Flow Through Thin and Thick Orifices in Horizontal Pipes

“…It is to be noted here that in the Eulerian scheme of solution, two continuity equations and two momentum equations were solved for two phases. The phase-coupled SIMPLE algorithm (Vasquez and Ivanov [30], Ansari and Shokri [31]) which is an extension of the SIMPLE algorithm (Patankar [29]) for multiphase flows was used for the pressure-velocity coupling. The velocities were solved coupled by the phases, but in a segregated fashion.…”