Speaker
Martin Kubečka
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.3006.pdf
Simulation of shock-waves in water induced by nanosecond-laser pulse
M. Kubečka1 , A. Obrusník1 , Z. Bonaventura1
1 Department of Physical Electronics, Faculty of Science, Masaryk University, Kotlářská 2,
611 37 Brno, Czech Republic
One of the main advantages of using the nanosecond-laser pulses for generation of fast break-
down of water is to avoid the presence of metal-liquid interface. The laser-produced breakdown
is well known phenomenon that generates shock-waves in liquid. The main physical mech-
anisms responsible for shock-waves in liquid by laser pulse were found to be linear optical
absorption with subsequent bulk thermal expansion, explosive evaporation and dielectric break-
down and ionization [1, 2].
We study this acoustic phenomenon by simulating the generation of shock-waves using hy-
drodynamic model for motion of compressible liquid (water) described by equation of continu-
ity for mass, momentum equation and the Tait equation [3]
∂ρ
+ ∇ · (ρ~u) = 0
∂t
∂~u 2 1
ρ + (~u · ∇)~u = −∇p + η ∇ ~u + ∇(∇ ·~u)
∂t 3
γ
ρ
p = (p0 + B) −B
ρ0
where ρ is the fluid density, p is the pressure, ~u is the velocity, η is the dynamic viscosity, B is
the compressibility of the liquid and γ is a material parameter.
The aim of our work is to simulate the propagation of shock-wave to reconstruct numerical
Schlieren images for comparison with experimental data.
Acknowledgements
This research has been supported by the Czech Science Foundation grant no. 18-04676S.
References
[1] B. D. Strycker, et al., Optics express (21), 20 (2013)
[2] F. V. Bunkin, A. A. Kolomensky, V. G. Mikhalevich, Lasers in Acoustics (12) (1991)
[3] M. N. Shneider, M. Pekker, Physical Review E (87), 4 (2013)
