II.  3-D flow with solid particles

           2.1-Physical 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.
Density  (kg/m3)
Diameter  (m)
Initial velocity  (m/s)
1.2 E3
4.0 E-5


        2.2-Modelling strategy

       The following modelling strategy is adopted :

        2.3-Particle creation

        Using the "NavCenter" section of the STARGUIde  window, we set the basic features of our model. We choose the option Lagrangian Multi-phase from the "Multi-phase treatment" menu and in the "Two-Phase Lagrangian Calculations", we take the option On-Coupled.  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 pre-processing task is now complete and it is advised to save all the model, write the problem and geometry file before starting the post-processing.

        2.4-Computing and results

        To plot particle tracks stoted in the file tut.trk :

        The following figure present the plot of the particle tracks continuously :


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