Jan 31, 2025: Data of the 2nd LPT and DA challenge are now ready for download!
Following the 2020 1st Challenge edition, the 2nd Challenge gathers several test cases aiming at assessing and comparing the performance of Lagrangian Particle Tracking (LPT) and Data Assimilation (DA) approaches. Test cases of the present challenge are more numerous and diverse than in the 1st edition, in the idea of assessing a larger variety of parameters. Participants are free to compete on a single acquisition modality (e.g., two-pulse Lagrangian Particle Tracking), or on several of them.
Several cases are available for both LPT and DA, and are thus described on separate pages: LPT cases and DA cases, together with participation rules. Guidelines for data formatting are contained in each dataset's description.
Whatever the challenge and the acquisition, data should be uploaded on this portal by Apr. 29, 2025. For more info check the pages of the cases!
Results will be presented at a dedicated workshop in Tokyo, on June 25, 2025, in between the ISFV21 and ISPIV2025 conferences.
For any question, please do not hesitate to contact the organizers!
2nd LPT and DA challenge: LPT cases
Three LPT cases are available, each with a different assessment objective:
- Case 1 contains time-resolved (TR) synthetic data of a turbulent channel flow, at a seeding density of 0.1 particles per pixel (ppp), for three different time separations between the pulses.
- Case 2 consists of synthetic two-pulse (TP) and TR acquisitions of a near-wall flow downstream of cylindrical obstacles. Datasets explore various seeding densities, as well as the influence of two geometrical effects (Mie scattering considered or not, field viewed by all or only a subset of the cameras, controlled by the "I/U" ratio, between the volumes of the intersection and union of cameras' fields of view)
- Case 3 is an experimental test case, whereby Rayleigh-Bénard Convection is investigated using TP and TR sequences, at various seeding densities.
2nd LPT and DA Challenge: DA cases
Three DA cases are available, each addressing different physics:
- Case 1 contains two-pulse (TP), four-pulse (FP) and time-resolved (TR) sequences of an incompressible turbulent channel flow, at various seeding densities
- Case 2 consists of TR sequences of a compressible turbulent boundary layer at a Mach number of 4.9. Parameters explored are the separation time between pulses, the seeding density, and the inertial or non-inertial character of particles
- Case 3 consists of TR sequences of Rayleigh-Bénard Convection at various seeding densities
