Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G01: Non-Equilibrium and Transient Mechanics of Granular and Soft Materials I
11:30 AM–2:30 PM,
Tuesday, March 7, 2023
Room: Room 124
Sponsoring
Units:
GSNP DSOFT DFD
Chair: Ishan Srivastava, Lawrence Berkeley National Laboratory
Abstract: G01.00013 : Erosion by the unsteady motion of a disk close to a granular bed*
2:18 PM–2:30 PM
Presenter:
Joanne Steiner
(Paris-Saclay University)
Authors:
Joanne Steiner
(Paris-Saclay University)
Cyprien Morize
(Paris-Saclay University)
Ivan Delbende
(Sorbonne University)
Alban Sauret
(UC Santa Barbara)
Philippe Gondret
(Paris-Saclay University)
Collaboration:
STEINER
We focus here on a half-oscillation, which means that the disk only moves downwards or upwards once with smooth acceleration and deceleration. The disk travels the distance L in a characteristic time τ. The motion of the disk is responsible for the formation of a vortex ring due to the roll-up of the shear layer produced at the edge of the disk. The influence of L, D and h0 as well as the initial position of the disk, on the flow is experimentally investigated by Particle Image Velocimetry (PIV) and numerically with the open-source code Basilisk. The axisymmetric numerical simulations are in good agreement with the experimental results. The time evolution of the vortex-ring circulation Γ, radius a and location relative to the disk
is determined, as well as scaling laws in relation to the parameters of the disk motion.
The characterization of the flow field helps to understand the erosion of the granular bed. It highlights the competitive effects on the erosion of the interaction of the vortex ring with the granular bed and the fluid ejection/injection between the disk and the granular bed.
*/
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