Title: Analysis of interface instabilities of separated gas-liquid two-phase flows with conservative two-fluid model

Authors: Iman Abbaspour; Vahid Shokri

Addresses: Department of Mechanical Engineering, Sari Branch, Islamic Azad University, P.O. Box 4816119318, Sari, Iran ' Department of Mechanical Engineering, Sari Branch, Islamic Azad University, P.O. Box 4816119318, Sari, Iran

Abstract: A numerical study is conducted in order to simulate separated two-phase flows of gas-liquid with conservative two-fluid model. Firstly, different numerical methods are examined to investigate the flow characteristics and stability of equations. The shock-capturing method is developed to an algorithm scripted in Fortran; and the force method is selected due to the higher accuracy. For validation of the simulations, instability range is compared to the calculations using the classic Kelvin-Helmholtz instability (KHI) equation. The wave growth was examined in a pipe and were compared with previous articles. The instability range of this research covers the classic KHI equation for the long wavelength with small amplitude. Results reveal that when the wavelengths are reduced, KHI range is not consistent, and wavelength effects on instability and KHI range is over predicted. This study presents a modified numerical method that improved the consistency with the analytical solution in comparison with other prior researchers' codes.

Keywords: two-phase flow; two-fluid model; numerical simulation; conservative two-fluid model.

DOI: 10.1504/PCFD.2022.125745

Progress in Computational Fluid Dynamics, An International Journal, 2022 Vol.22 No.5, pp.279 - 287

Accepted: 04 Dec 2021
Published online: 27 Sep 2022 *

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