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Laser–matter interactions : Inhomogeneous Richtmyer–Meshkov and Rayleigh–Taylor instabilities


Lugomer, Stjepan
Laser–matter interactions : Inhomogeneous Richtmyer–Meshkov and Rayleigh–Taylor instabilities // Laser and particle beams, 34 (2016), 1; 123-136 doi:10.1017/S0263034615000956 (međunarodna recenzija, članak, znanstveni)


Naslov
Laser–matter interactions : Inhomogeneous Richtmyer–Meshkov and Rayleigh–Taylor instabilities

Autori
Lugomer, Stjepan

Izvornik
Laser and particle beams (0263-0346) 34 (2016), 1; 123-136

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Richtmyer-Meshkov instablity; Rayleigh-Taylor instability; Turbulent mixing; Self-similar structures; Coherent structures

Sažetak
In this experimental study the ablative Richtmyer-Meshkov (RM) and the Rayleigh-Taylor (RT) instabilities were generated by the laser pulse of Gaussian-like power profile. The initial multimodal perturbation, the inhomogeneous momentum transfer and different Atwood numbers generate different shapes of spikes and bubbles in the central region (CR) and the near-central region (NCR) of the spot. A one dimensional Gaussian-like power profile causes the formation of the wavy-like rows of aperiodic spikes. The periodic spike segments inside the rows appear due to locally coherent flow. In the NCR, the mushroom-shape spikes tend to the organization on the isotropic square and the anisotropic rhombic lattices. The increase of the lattice periods 2, 3 or 4 times indicates formation of superstructures. The growth of sharp asymmetric RM/RT spikes in the CR is fast, uncorrelated and linear, while the growth of the symmetric mushroom-shape ones in the NCR is slow, correlated and nonlinear.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

Napomena
Rad prezentira posve nove spoznaje o razvoju Richtmyer-Meshkov i Rayleigh-Taylor nestabilnostima i korigira neke do sada prihvacene spoznaje.



POVEZANOST RADA


Projekt / tema
098-0982904-2898 - Fizika i primjena nanostruktura i volumne tvari (Mile Ivanda, )
IP-2014-09-7046

Ustanove
Institut "Ruđer Bošković", Zagreb

Autor s matičnim brojem:
Stjepan Lugomer, (58170)

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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