Radioactive Particle Tracking (RPT)

Radioactive particle tracking (RPT) is a non-intrusive velocimetry method that is used to study the hydrodynamics of single and multiphase systems. Launching a RPT simulation for photon count calculation in Lethe requires a solver which is lethe-rpt-3d`, a parameter file, and two files including detector and particle positions inside the vessel. The ``particle positions file includes either the experimental calibration positions or a set of generated points inside the vessel by the user. The detector positions file contains the position of the detector face’s center and the position of a point inside the detector on its axis. In Lethe-RPT code the middle of the bottom face of the cylindrical vessel is considered as the origin. An example of these two files can be found here. This section aims at describing the various parameters available within Lethe-RPT.

The parameter file is composed of different subsections. The principal subsections of a RPT parameter template file are :

• Detector Parameters
• FEM Reconstruction
• Parameter Tuning
• RPT Parameters