Altshuler, Ernesto; Torres, H; González_Pita, A; Sánchez, Colina G; Pérez Penichet, Carlos; Waitukaitis, Scott RIST Austria ; Hidalgo, Rauól
While the penetration of objects into granular media is well-studied, there is little understanding of how objects settle in gravities, geff, different from that of Earth - a scenario potentially relevant to the geomorphology of planets and asteroids and also to their exploration using man-made devices. By conducting experiments in an accelerating frame, we explore geff ranging from 0.4 g to 1.2 g. Surprisingly, we find that the rest depth is independent of geff and also that the time required for the object to come to rest scales like geff-1/2. With discrete element modeling simulations, we reproduce the experimental results and extend the range of geff to objects as small as asteroids and as large as Jupiter. Our results shed light on the initial stage of sedimentation into dry granular media across a range of celestial bodies and also have implications for the design of man-made, extraterrestrial vehicles and structures. Key Points The settling depth in granular media is independent of gravity The settling time scales like g-1/2 Layering driven by granular sedimentation should be similar.
Geophysical Research Letters
The Spanish MINECO project FIS2011-26675, the PIUNA program (U. Navarra), and the Project 29942WL (Fonds de Solidarité Prioritaire France-Cuba) have partially supported this research.
3032 - 3037
Altshuler E, Torres H, González_Pita A, et al. Settling into dry granular media in different gravities. Geophysical Research Letters. 2014;41(9):3032-3037. doi:10.1002/2014GL059229
Altshuler, E., Torres, H., González_Pita, A., Sánchez, C. G., Pérez Penichet, C., Waitukaitis, S. R., & Hidalgo, R. (2014). Settling into dry granular media in different gravities. Geophysical Research Letters. Wiley-Blackwell. https://doi.org/10.1002/2014GL059229
Altshuler, Ernesto, H Torres, A González_Pita, Colina G Sánchez, Carlos Pérez Penichet, Scott R Waitukaitis, and Rauól Hidalgo. “Settling into Dry Granular Media in Different Gravities.” Geophysical Research Letters. Wiley-Blackwell, 2014. https://doi.org/10.1002/2014GL059229.
E. Altshuler et al., “Settling into dry granular media in different gravities,” Geophysical Research Letters, vol. 41, no. 9. Wiley-Blackwell, pp. 3032–3037, 2014.
Altshuler E, Torres H, González_Pita A, Sánchez CG, Pérez Penichet C, Waitukaitis SR, Hidalgo R. 2014. Settling into dry granular media in different gravities. Geophysical Research Letters. 41(9), 3032–3037.
Altshuler, Ernesto, et al. “Settling into Dry Granular Media in Different Gravities.” Geophysical Research Letters, vol. 41, no. 9, Wiley-Blackwell, 2014, pp. 3032–37, doi:10.1002/2014GL059229.