Grid Generation Issues in the CFD Modelling of Two-Phase Flow in a Pipe

The grid generation issues found in the 3D simulation of two-phase flow in a pipe using Computational Fluid Dynamics (CFD) are discussed in this paper. Special attention is given to the effect of the element type and structure of the mesh. The simulations were carried out using the commercial software package STAR-CCM+, which is designed for numerical simulation of continuum mechanics problems. The model consisted of a cylindrical vertical pipe. Different mesh structures were employed in the computational domain. The condition of two-phase flow was simulated with the Volume of Fluid (VOF) model, taking into consideration turbulence effects using the k-e model. The results showed that there is a strong dependency of the flow behaviour on the mesh employed. The best result was obtained with the grid known as butterfly grid, while the cylindrical mesh produced misleading results. The simulation was validated against experimental results.

[1]  C. W. Hirt,et al.  Volume of fluid (VOF) method for the dynamics of free boundaries , 1981 .

[2]  Chiu-On Ng,et al.  Simulation of wave propagation over a submerged bar using the VOF method with a two-equation k-e turbulence modeling , 2004 .

[3]  Weeratunge Malalasekera,et al.  An introduction to computational fluid dynamics - the finite volume method , 2007 .

[4]  O. Ubbink.  Numerical prediction of two fluid systems with sharp interfaces , 1997 .

[5]  D. Spalding,et al.  A calculation procedure for heat, mass and momentum transfer in three-dimensional parabolic flows , 1972 .

[6]  Rajamani Krishna,et al.  Eulerian simulations for determination of the axial dispersion of liquid and gas phases in bubble columns operating in the churn-turbulent regime , 2001 .

[7]  J. Brackbill,et al.  A continuum method for modeling surface tension , 1992 .

[8]  Barry J. Azzopardi,et al.  Comparative study of gas–oil and gas–water two-phase flow in a vertical pipe , 2010 .

[9]  Masud Behnia,et al.  Bubble motion during inclined intermittent flow , 2001 .

[10]  R. I. Issa,et al.  A numerical model of slug flow in vertical tubes , 1997 .

[11]  Barry J. Azzopardi,et al.  Effects Of Physical Properties On The BehaviourOf Taylor Bubbles , 2009 .

[12]  Alexandra M.F.R. Pinto,et al.  Coalescence of two gas slugs rising in a vertical column of liquid , 1996 .

[13]  Lin Ma,et al.  A finite volume method for fluid flow in polar cylindrical grids , 1998 .

[14]  Alexandra M.F.R. Pinto,et al.  Coalescence of two gas slugs rising in a co-current flowing liquid in vertical tubes , 1998 .

[15]  V. H. Perez,et al.  Gas-liquid two-phase flow in inclined pipes , 2008 .

[16]  K. S. Rezkallah,et al.  A numerical model of Taylor bubbles rising through stagnant liquids in vertical tubes , 1998 .

[17]  Zai-Sha Mao,et al.  The motion of Taylor bubbles in vertical tubes. I: a numerical simulation for the shape and rise velocity of Taylor bubbles in stagnant and flowing liquid , 1990 .

[18]  Han Shik Chung,et al.  Natural convection heat transfer estimation from a longitudinally finned vertical pipe using CFD , 2009 .

[19]  U. Hampel,et al.  Capacitance wire-mesh sensor for fast measurement of phase fraction distributions , 2007 .

[20]  B. Launder,et al.  The numerical computation of turbulent flows , 1990 .