scholarly journals Non-axisymmetric impact creates pineapple-shaped cavity

2011 ◽  
Vol 23 (9) ◽  
pp. 091106 ◽  
Author(s):  
Oscar R. Enríquez ◽  
Ivo R. Peters ◽  
Stephan Gekle ◽  
Laura E. Schmidt ◽  
Devaraj van der Meer ◽  
...  
Keyword(s):  
Axisymmetric Impact

Local characteristics of an axisymmetric impact jet

1996 ◽  
Vol 69 (4) ◽  
pp. 481-488
Author(s):  
S. V. Alekseenko ◽  
V. V. Kylebyakin ◽  
D. M. Markovich ◽  
N. A. Pokryvailo ◽  
V. V. Tovchigrechko
Keyword(s):  
Local Characteristics ◽  
Axisymmetric Impact ◽  
Impact Jet

scholarly journals Quasi-normal free-surface impacts, capillary rebounds and application to Faraday walkers

2019 ◽  
Vol 873 ◽  
pp. 856-888 ◽  
Author(s):  
C. A. Galeano-Rios ◽  
P. A. Milewski ◽  
J.-M. Vanden-Broeck
Keyword(s):  
Free Surface ◽  
Incompressible Fluid ◽  
Wave Field ◽  
Potential Flow ◽  
Droplet Surface ◽  
Time Dependent ◽  
Bath Surface ◽  
Normal Impact ◽  
Droplet Impacts ◽  
Axisymmetric Impact

We present a model for capillary-scale objects that bounce on a fluid bath as they also translate horizontally. The rebounding objects are hydrophobic spheres that impact the interface of a bath of incompressible fluid whose motion is described by linearised quasi-potential flow. Under a quasi-normal impact assumption, we demonstrate that the problem can be decomposed into an axisymmetric impact onto a quiescent bath surface, and the unforced evolution of the surface waves. We obtain a walking model that is free of impact parametrisation and we apply this formulation to model droplets walking on a vibrating bath. We show that this model accurately reproduces experimental reports of bouncing modes, impact phases and time-dependent wave field topography for bouncing and walking droplets. Moreover, we revisit the modelling of horizontal drag during droplet impacts to incorporate the effects of the changes in the pressed area during droplet–surface contacts. Finally, we show that this model captures the recently discovered phenomenon of superwalkers.

Axisymmetric impact of a shell on an elastic halfspace

1995 ◽  
Vol 31 (10) ◽  
pp. 829-835
Author(s):  
V. D. Kubenko ◽  
V. R. Bogdanov
Keyword(s):  
Elastic Halfspace ◽  
Axisymmetric Impact

Axisymmetric Elastic-Plastic Wave Propagation in 6061-T6 Aluminum Bars of Finite Length

1969 ◽  
Vol 36 (3) ◽  
pp. 533-541 ◽  
Author(s):  
L. D. Bertholf ◽  
C. H. Karnes
Keyword(s):  
Numerical Solution ◽  
Quartz Crystal ◽  
Artificial Viscosity ◽  
Two Dimensional ◽  
Plastic Wave ◽  
Strain Gages ◽  
Viscosity Approximation ◽  
The Impact ◽  
Axisymmetric Impact ◽  
Is Strain

The axisymmetric impact of two identical 6061-T6 aluminum bars is experimentally and analytically studied. Experimental records are obtained from foil strain gages and thin quartz crystal gages located near the impact end, and at distances of one, two, and three radii from the impact end of a bar with a total length of four radii. These measurements are compared with the numerical solution of the “exact” equations of two-dimensional axisymmetric motion obtained by using the artificial viscosity approximation. The constitutive relation employed in the numerical solution is strain-rate independent with linear isotropic strain hardening.

scholarly journals Collapse and pinch-off of a non-axisymmetric impact-created air cavity in water

2012 ◽  
Vol 701 ◽  
pp. 40-58 ◽  
Author(s):  
Oscar R. Enriquez ◽  
Ivo R. Peters ◽  
Stephan Gekle ◽  
Laura E. Schmidt ◽  
Detlef Lohse ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Single Mode ◽  
Long Term Memory ◽  
Air Cavity ◽  
Universal Power Law ◽  
Dimensional Shape ◽  
Air Cavities ◽  
Three Dimensional Shape ◽  
Axisymmetric Impact

AbstractThe axisymmetric collapse of a cylindrical air cavity in water follows a universal power law with logarithmic corrections. Nonetheless, it has been suggested that the introduction of a small azimuthal disturbance induces a long-term memory effect, reflecting in oscillations which are no longer universal but remember the initial condition. In this work, we create non-axisymmetric air cavities by driving a metal disc through an initially quiescent water surface and observe their subsequent gravity-induced collapse. The cavities are characterized by azimuthal harmonic disturbances with a single mode number $m$ and amplitude ${a}_{m} $. For small initial distortion amplitude (1 or 2 % of the mean disc radius), the cavity walls oscillate linearly during collapse, with nearly constant amplitude and increasing frequency. As the amplitude is increased, higher harmonics are triggered in the oscillations and we observe more complex pinch-off modes. For small-amplitude disturbances we compare our experimental results with the model for the amplitude of the oscillations by Schmidt et al. (Nature Phys., vol. 5, 2009, pp. 343–346) and the model for the collapse of an axisymmetric impact-created cavity previously proposed by Bergmann et al. (J. Fluid Mech., vol. 633, 2009b, pp. 381–409). By combining these two models we can reconstruct the three-dimensional shape of the cavity at any time before pinch-off.

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