Limitations with the PT registration method

When using registration zones to identify particles that move through certain parts of the model it should be noted that particles can appear more than once in the output. As they move from one zone to the next they are repeat­edly registered and are finally also registered when they are removed from the model by a sink. An example would be a particle moving into a registra­tion zone with code 1. The particle is then registered as being in an 'active cell' and the registration zone code and travel time to this zone is memorised. If the particle is at a later time removed by a well it will again be registered but now it will be registered as being removed by the 'Well' sink.

If there are multiple wells within one cell and output for wells is requested then the output can contain the same particle more than once. As the model does not know which of the wells the particle should be assigned to (the pro­gram looks at the total well sink for the cell and cannot distinguish individual wells) the particle will be repeated for each of the wells within the cell.