TITLE : Two-phase flow in a bifurcation

BY : Dr S V Zhubrin, CHAM Ltd

DATE : November, 2000

FOR : Demonstration case for PHOENICS 3.3.1

INTRODUCTION

The turbulent two-phase flow in bifurcating channel is solved here on Cartesian grid by "cut-off" technique of PARSOL.

The case is aimed to demonstrate the PARSOL performance for two-phase flows with a phase slip.

PHYSICAL SITUATION

The demonstration case considers the turbulent flow of dispersed air/water mixture in the branching channel designed as two-dimensional asymmetrical bifurcation.

In this case the pressure distribution, phase volume fractions, velocity fields of air and particulate water have to be calculated.

COMPUTATIONAL DETAILS

The independent variables of the problem are the two components of cartesian coordinate system, namely X and Y.

The main dependent (solved for) variables are:

• Pressure, P1,
• Two components of air velocity, U1 and V1,
• Two components of water velocity, U2 and V2,
• Air and water volume fractions, R1 and R2,
• Turbulence kinetic energy, KE, and
• Rate of its dissipation. EP.

THE RESULTS

The plots show the distribution of the pressure, velocities, and phase volume fractions within the bifurcating channel.

Pictures are as follows :

• Geometry and the grid
• Airflow streamlines
• Pressure contours
• Air velocity contours
• Water velocity contours
• Water volume fractions
• Turbulent viscosity
• Turbulence energy
• Turbulent length scale

THE IMPLEMENTATION

All model settings have been made in VR-Editor of PHOENICS 3.3.1

The relevant Q1 file can be inspectedby clicking here.

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