Dresden 2020 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 56: Poster: Glasses; Granular Matter; Brownian Motion and Anomalous Diffusion
DY 56.4: Poster
Thursday, March 19, 2020, 15:00–18:00, P1A
The role of initial speed in projectile impacts into light granular media — •Kai Huang1,2, Dariel Hernadez Delfin3, Felix Rech1, Valentin Dichtl1, and Raul Cruz Hidalgo3 — 1Experimentalphysik V, Universität Bayreuth, 95440 Bayreuth, Germany — 2Division of Natural and Applied Sciences, Duke Kunshan University, 215306 Kunshan, Jiangsu, China — 3Department of Physics and Applied Mathematics, University of Navarra, 31009 Pamplona, Spain
Projectile impact into a light granular material composed of expanded polypropylene (EPP) particles is investigated systematically with various impact velocities. Experimentally, the trajectory of an intruder moving inside the granular material is monitored with a recently developed microwave radar system noninvasively. Numerically, discrete element simulations together with coarse-graining techniques are employed to address both dynamics of the intruder and response of the granular bed. Our experimental and numerical results of the intruder dynamics agree with each other quantitatively and are in congruent with existing phenomenological model on granular drag. Stepping further, we explore the ‘microscopic’ origin of granular drag through characterizing the response of granular bed, including density, velocity and kinetic stress fields at the mean-field level. The macroscopic profiles of the granular bed ahead of the intruder decays exponentially in the co-moving system of the intruder, giving rise to a characteristic length scale on the order of intruder size.