Several experiments dedicated to the study of the behavior of a granular medium in low-gravity have been performed during 9 parabolic flight campaigns (2015-2020) via the ESA VIP-GRAN-PF instrument.
This versatile instrument allows us the study of a wide range of properties of a granular medium in low-gravity. Its modular design, based on several interchangeable experimental cells, allows the study of both dilute and dense regimes in reduced gravity (e.g. granular gas, segregation of a heterogeneous granular material, sound propagation, granular convection, jamming and rheology). The instrument is fully described in Ref.  as well as the main objectives and preliminary results.
Eight ESA Parabolic Flight Campaigns was performed in low-gravity environment onboard the Airbus Zero-G. A couple of them was devoted to instrument tests, others led to the first scientific results [1,2,3,4]:
- The first observation in low-gravity of a phenomenon of segregation within a mixture of bi-disperse driven grains, which helps to better understand the granular surface (regolith) of certain astrophysical stars .
- The origin of the transition from a gase-like regime to a solid-like regime of particles (cluster), when the density of particles increases, has been also explained .
 E. Opsomer, M. Noirhomme, N. Vandewalle, E. Falcon and S. Merminod, Segregation and pattern formation in dilute granular media under microgravity conditions, Nature PJ Microgravity 3, 1 (2017)
 S. Aumaître, R. P. Behringer, A. Cazaubiel, E. Clément, J. Crassous, D. J. Durian, E. Falcon, S. Fauve, D. Fischer, A. Garcimartin, Y. Garrabos, M. Hou, X. Jia, C. Lecoutre, S. Luding, D. Maza, M. Noirhomme, E. Opsomer, F. Palencia, T. Pöschel, J. Schockmel, M. Schröter, M. Sperl, R. Stannarius, N. Vandewalle, and P. Yu, An instrument for studying granular media in low-gravity environment, Review of Scientific Instruments 89, 075103 (2018)
 M. Noirhomme, A. Cazaubiel, A. Darras, E. Falcon, D. Fischer, Y. Garrabos, C. Lecoutre-Chabot, S. Merminod, E. Opsomer, F. Palencia, J. Schockmel, R. Stannarius, N. Vandewalle, Threshold of gas-like to clustering transition in driven granular media in low-gravity environment, Europhysics Letters (EPL) 123, 14003 (2018) & Supp. Materials
 M. Noirhomme, A. Cazaubiel, A. Darras, E. Falcon, D. Fischer, Y. Garrabos, C. Lecoutre-Chabot, E. Opsomer, F. Palencia, U. Petrone, J. Schockmel, R. Stannarius, N. Vandewalle, Dynamics of large intruders moving in a thermalized-like granular gas in low-gravity environment, to be submitted to Europhysics Letters (EPL) (2020)
Parabolic flight campaigns performed with ESA VIP-GRAN-PF instrument: