Evaluating residence time distributions on outlets is often an important result for Lagrangian particle flows (LMP). This article describes a methodology calculating histogram plots of the residence time at outlets.
For many Lagrangian evaluations in Simcenter STAR-CCM+ the boundary sampling is a very good choice. It stores all the particles in contact with a boundary for one time step (or iteration in steady state mode). This is important as Lagrangian particles use a different time step as the CFD solver. In transient simulations the information needs to be accumulated for more than one time step.
For particle size distributions more simple methodologies should be preferred. These are discussed in Evaluate Particle Size Distribution on Outlets. These methods use a second evaluation Lagrangian Phase to store the data. A parcel transfer injector is used to re-create the particles. Unfortunately, this injector cannot be used for the residence time.
Please find an example simulation attached. In this picture you can see how the residence time distribution is very different for the two outlets. BS1 is the bottom surface. Particles hit it very quickly. BS 2 is the upper outlet facing the camera. Here particles need at least one revolution before hitting the outlet.
An alternative to the parcel transfer injector is described in this article. A table is used to store the particle data and a table injector is used to inject the exact same parcels into the evaluation phase for accumulation.