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12.2.4 Particles or Droplets Introduced at the Start of the Calculation
Sometimes it is convenient to introduce droplets or particles at the start of the simulation. For this purpose,NUMBER_INITIAL_DROPLETS is the number of particles/droplets within the computational domain at the start of the simulation. Its default value is 0, meaning that initially there are no particles or droplets present.
If non-zero, also specify MASS_PER_VOLUME (kg/m3) which specifies the particle/droplet mass per unit volume (Default 1 kg/m3). Do not confuse this parameter with DENSITY, explained in the next section. For example, water has a DENSITY of 1000 kg/m3, whereas a liter of water broken up into droplets and spread over a cubic meter has a MASS_PER_VOLUME of 1 kg/m3. Also, to limit the particles/droplets to a certain region of the domain, add the real sextuplet XB to designate the coordinates of a rectangular volume. The format for XB is the same as that used on the OBST line.
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