Final velocity and position

For the final state of the particles, this trajectory calculation code generates following three files:

• initialVelocity.dat

• finalPosition.dat

• finalVelocity.dat

As indicated by their names, first three files respectively contain the initial velocities, final positions, and final velocities of the particles. The initial position is not dumped since it is in particle/particleSet file. Below figure shows a screenshot of a finalVelocity.dat file. The each line correspond to the each particle in the particle/particleSet file in same order. Then, the first three columns in those files store the each components (x, y, z) of coordinates/velocities of each particles at the end of the trajectory. The 4th and 5th columns respectively show the each particle ID of that row and the ending boundary ID which detected the ending condition of the trajectory. Where the boundary ID -1 means the particle any exit or adsorption event was detected by the maximum trajectory calculation time, which is often occurred by trapping circulating flow.

Figure. A screenshot of the finalPosition.dat file showing the final positions of the simulated particles. The first particle has an ID of 0 and its final position is (4.12e-5, -9.83e-3, 5.00e-5). This particle exited the simulation domain through an outlet with a boundary ID of 18. Particles with IDs 1-3 also exited through the same outlet. Particles with IDs 4-7 may have been trapped in a circulating flow. Particles with IDs 8-11 were collected by a wall with a boundary ID of 9.

Two main properties what you can get from processing of these files are:

• Event probability of "exit" or "adsorption" on each boundary

• Velocity and concentration distributions of "exit" or "adsorption" on each boundary