2.1Physical
Problem Description
The problem
geometry and flow conditions are as described in the previously chapter.
The additional physical complexity comes from the fact
that the air stream is now seeded with solid particles,which
are uniformly distributed at the duc inlet. The volumetric loading of particles
in the incoming air is 0.01%, corresponding to a volumetric particle flow
rate of 6.4516*10^7 m3/s.






2.2Modelling strategy
The following modelling strategy is adopted :
2.3Particle
creation
Using the "NavCenter"
section of the STARGUIde window, we set the basic features of our
model. We choose the option Lagrangian Multiphase from the "Multiphase
treatment" menu and in the "TwoPhase Lagrangian Calculations",
we
take the option OnCoupled. Then, we have to set, by clicking
the option Edit Dropplet Parcels, the initial diameter, density
and temperature of a typical particle in the parcel, as well as its initial
position coordinates and initial velocity components. To generated a uniform
particle distribution over the inlet area, use the command DRGENERATE to
specifiy different locations for nes sets of parcels.
The properties
are set using the Droplet Properties dialog by clicking Edit
Droplet Properties. It is possible to display the particle location
within the overall model geometry in the droplets panel :
Plot of a particle initial conditions
At that level,
the preprocessing task is now complete and it is advised to save all the
model, write the problem and geometry file before starting the postprocessing.
2.4Computing and results
To plot particle tracks stoted in the file tut.trk :
The following
figure present the plot of the particle tracks continuously :

