Hi everyone,

I am a new user of CFX-4.3. Could someone please tell me how I can write a command file for a simple flow in a pipe using the Eulerian particle tracking. I have looked at the examples but most of them uses Langrangian technique.

Regards, Chie Min

Hi' Chie Min

Here is a start for you, (I hope) I have simulated Oil (as dispersed droplets) in water Regards Jan

>>OPTIONS

THREE DIMENSIONS

NUMBER OF PHASES 2

..
:>PHASE NAMES

PHASE1 'WATER'

PHASE2 'OIL'
:>MODEL DATA
:>AMBIENT VARIABLES

PHASE NAME 'WATER'

VOLUME FRACTION 1.0
:>AMBIENT VARIABLES

PHASE NAME 'OIL'

VOLUME FRACTION 0.0

>>PHYSICAL PROPERTIES

>>BUOYANCY PARAMETERS

GRAVITY VECTOR 0.0 -9.81 0.0

>>FLUID PARAMETERS

PHASE NAME 'OIL'

VISCOSITY 8.5E-3

DENSITY 850.

>>FLUID PARAMETERS

PHASE NAME 'WATER'

VISCOSITY 4.666E-4

DENSITY 938.

>>MULTIPHASE PARAMETERS
:>PHASE DESCRIPTION

PHASE NAME 'OIL'

LIQUID

DISPERSE

MEAN DIAMETER 1.0000E-03

MINIMUM VOLUME FRACTION 1.0000E-10

>>PHASE DESCRIPTION

PHASE NAME 'WATER'

LIQUID

CONTINUOUS

MODIFY EMPTY CELL VELOCITY 1.E-10

>>INTER PHASE TRANSFER MODELS
:>MOMENTUM

FIRST PHASE NAME 'WATER'

SECOND PHASE NAME 'OIL'

SURFACE TENSION COEFFICIENT 0.0659

>>PARTICLE DRAG MODEL

FLOW REGIME 'AUTOMATIC'