injection/ particle tracking
 

Dear CFX users,

I am trying to simulate the following case: air flows through a pipe. Water droplets are injected from a arbitrary location situated in the pipe wall.

The difficulties are:

1. How can I define the injection points/regions?

2. It is possible to activate evaporation for the water droplets?

Thank you very much,

Ioana

Re: injection/ particle tracking
 

Hello Ioana,

Here is the answer for your 1st question.

Yes, you can define the injection points. This has to be done in the comman file. You can find more on this in CFX manual. For your convenience I attached a sample code below.

#CALC

NORMVEL = 45.72;

PARTDIAM = 300.0E-6;

PMFLOW = 0.0001;

NUMPART=1000;

XPSTART=0.0;

XPEND=0.75;

INC=(XPEND-XPSTART)/(NUMPART-1); #ENDCALC
:>MODEL BOUNDARY CONDITIONS
:>PARTICLE TRANSPORT BOUNDARY CONDITIONS

POSITIONS IN X DIRECTION #NUMPART* 0.0

POSITIONS IN Y DIRECTION #XPSTART TO #XPEND BY #INC

POSITIONS IN Z DIRECTION #NUMPART* 0.0

INITIAL PARTICLE DIAMETERS #NUMPART* #PARTDIAM

PARTICLE MASS FLOW RATES #NUMPART* #PMFLOW

U VELOCITY #NUMPART* #NORMVEL

V VELOCITY #NUMPART* 0.0

W VELOCITY #NUMPART* 0.0