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Particle trajectories and pathlines drawn by ANSYS Fluent use the velocity relative to the cell zone motion.For massless particles, the resulting path lines follow the streamlines based on relative velocity. For particles with mass, however, the particle tracks displayed are meaningless. Similarly, coupled discrete-phase calculations are meaningless.An alternative approach for particle tracking and coupled discrete-phase calculations with multiple reference frames is to track particles based on absolute velocity instead of relative velocity. To make this change, use the define/models/dpm/options/track-in-absolute-frame text command.Note, that the results may strongly depend on the location of walls inside the multiple reference frame. The particle injection velocities (specified in the Set Injection Properties Dialog Box (p. 2661)) are defined relative to the frame of reference in which the particles are tracked. By default, the injection velocities are specified relative to the local reference frame. If you enable the track-in-absolute frame option, the injection velocities are specified relative to the absolute frame.
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