Smoothed particle hydrodynamics simulation of a laser pulse impact onto a liquid metal droplet

Abstract

The impact of a laser pulse onto a liquid metal droplet is numerically investigated by utilising a weakly compressible single phase model; the thermodynamic closure is achieved by the Tait equation of state (EoS) for the liquid metal. The smoothed particle hydrodynamics (SPH) method, which has been employed in the arbitrary Lagrangian Eulerian (ALE) framework, offers numerical efficiency, compared to grid related discretization methods. The latter would require modelling not only of the liquid metal phase, but also of the vacuum, which would necessitate special numerical schemes, suitable for high density ratios. In addition, SPH-ALE allows for the easy deformation handling of the droplet, compared to interface tracking methods where strong mesh deformation and most likely degenerate cells occur. Then, the laser-induced deformation of the droplet is simulated and cavitation formation is predicted. The ablation pattern due to the emitted shock wave and the two low pressure lobes created in the middle of the droplet because of the rarefaction waves are demonstrated. The liquid metal droplet is subject to material rupture, when the shock wave, the rarefaction wave and the free surface interact. Similar patterns regarding the wave dynamics and the hollow structure have been also noticed in prior experimental studies.

Microdroplet-tin plasma sources of EUV radiation driven by solid-state-lasers (Topical Review)

“…On one extreme end, short fsps laser pulses create bubble-like targets (see figure 1 bottom panel) as described by, e.g. Kurilovich et al [15] (also see [16][17][18][19][20]) and more recently by De Faria Pinto et al [21] addressing also laser polarization dependencies. On the other extreme end, long (ns) laser pulses create strongly propelled, flattened targets (see figure 1 upper panel).…”

Computational Algorithms for Multiphase Hydrodynamics Models and Filtration

“…Методи часток широко використовуються для моделювання динамiки однорiдних рiдин та плазми [17][18][19][20][21]. Методи часток були узагальненi також до методу згладжених часток для моделювання рiзноманiтних процесiв динамiки рiдин [22][23][24][25]. Приклади розрахункiв за такими алгоритмами та докладну бiблiографiю можна знайти у роботах [21] та [25].…”

“…Методи часток були узагальненi до методу згладжених (або розмитих) часток [22,23], щоб моделювати рiзноманiтнi проблеми динамiки рiдин. Огляд та бiблiографiя для цього методу наведенi в [25]. Цей метод також застосовувався для моделювання багатофазних потокiв у [24], де наведено огляд такого застосування методу згладжених часток.…”

Numerical modeling of droplet rim fragmentation by laser-pulse impact using a multiscale two-fluid approach

“…Specifically, the smooth particle hydrodynamics (SPH) method is commonly adopted for the investigation of liquid tin droplets, which are subject to high energy picosecond laser beams. As depicted in the works of Grigoryev et al [21] and Koukouvinis et al [28], the SPH method can accurately predict the recoil pressure establishment and propagation inside the droplet, shortly after the laser-pulse impact, the formation of dominant cavitation regions, and the early-time explosive fragmentation, using a given particles population. Concerning the commonly utilized Eulerian methods in droplet fragmentation simulations due to mechanical impact [29], [30], [31], Zeng et al [22] employed the Volume of Fluids (VOF) method to study the cavitation-induced liquid jetting of a water droplet with a gas bubble in the centre at initial conditions, impacted by a millijoule laser pulse.…”