A comparison between the presence and absence of virtual viscosity in the behaviour of the two phase flow interface

Thermal Science

Abbasi Morteza¹  Shokri Vahid¹  Abbaspour Iman¹ 

[1] Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, Iran;

关键词: multiphase flow;    two phase flow;    two-fluid model;    numerical simulation;    virtual viscosity;   

DOI  :  10.2298/TSCI200801163A

来源: DOAJ

【 摘 要 】

In this paper, a numerical study is performed in order to investigate the effect of the virtual viscosity on simulation of separated two-phase flow of gas-liquid. The governing equations solved by shock capturing method which can provide predicting the interface without the flow field solving. In this work, in order to calculate the numerical flux term, first-order centered scheme (Force scheme) was applied cause of its accuracy and appropriate validation. Analysis approves that the obtained stability range of this research is consistent with the classic Kelvin- Helmholtz instability equation only for the long wavelength with small amplitude. Results reveal that when the wavelengths are reduced, the specified range is not consistent and wavelength effects on instability range and it is overpredicted. An algorithm for water faucet problem was developed in FORTRAN language. Short wavelength perturbations induce unbounded growth rates and make it impossible to achieve converging solutions. The approach taken in this article has been to adding virtual viscosity as a CFD technique, is used to remedy this deficiency.

【 授权许可】

Unknown