Large eddy simulation of a shocked gas cylinder instability induced turbulence SCIENCE CHINA Physics, Mechanics & Astronomy 53, 262 (2010); The gravity wave instability induced by photochemistry in summer polar mesopause region Chinese Science Bulletin 45, 267 (2000); Theoretical study on the influence of residual stress on adhesion-induced instability in MEMS Chinese Science Bulletin 54, 2606 (2009); Magnetospheric chorus wave instability induced by relativistic Kappa-type distributions
Large eddy simulation of a shocked gas cylinder instability induced turbulence SCIENCE CHINA Physics, Mechanics & Astronomy 53, 262 (2010); The gravity wave instability induced by photochemistry in summer polar mesopause region Chinese Science Bulletin 45, 267 (2000); Theoretical study on the influence of residual stress on adhesion-induced instability in MEMS Chinese Science Bulletin 54, 2606 (2009); Magnetospheric chorus wave instability induced by relativistic Kappa-type distributions
“…56 The results also showed that the intensity of vortex ring after re-shock is proportional to the initial shock strength and the initial Atwood number. 58…”
Section: Spherical Gaseous Interfacementioning
confidence: 99%
“…56 The results also showed that the intensity of vortex ring after re-shock is proportional to the initial shock strength and the initial Atwood number. 58 Figure 8.Schlieren pictures of a spherical helium bubble accelerated by a weak planar shock and its reflected shock from end wall with the reflected distance of 64 mm. 57 …”
Section: Interaction Of a Planar Shock Wave With A Fluid Interfacementioning
Richtmyer–Meshkov (RM) instability is regarded as a central role for understanding the hydrodynamic processes involved in inertial confinement fusion, supersonic combustion and supernova explosion. Because of its academic implication and engineering applications, the RM instability has received much attention since it was proposed. As an important tool for studying RM instability, shock tube experiment on shock–fluid interface interaction has been widely adopted and great progress has been achieved in past decades. The generation of a shock wave, the formation of an initial interface and the diagnostic of flow field are the three elements for studying the RM instability experimentally. This review surveys the advances in experimental investigations of RM instability in shock tube environment. Originating from a simple configuration as a planar shock interacting with a simple perturbed interface, the experimental study of RM instability approaches more complex situations like a convergent shock with a simple interface, or a planar shock with a complex interface. It is then expected that the experimental study on the real circumstance may be realized by using a complex shock with a complex interface. Finally, we propose the following issues for future study: (1) evolution of the RM instability induced by cylindrically converging shock waves; (2) effect of the three dimensions on the RM instability; (3) interaction of perturbed shock wave with an initially uniform or perturbed interface; and (4) formation and mixing mechanism of the compressible turbulence in the final stage of the RM instability.
“…Actually, the relationship between the gas bubble and the ambient gas is generally represented by a dimensionless parameter called the Atwood number, At = (ρ 2 − ρ 1 )/(ρ 2 + ρ 1 ), where ρ 1 and ρ 2 are the densities of the ambient and the bubble gases, respectively. To reveal the influence of the Atwood number on the shock-bubble interaction, two values of the Atwood number (At = 0.17 and 0.68) were investigated experimentally by Haehn et al 11 in 2012. The results showed that a secondary vortex ring appeared immediately after reshock for the low Atwood number case.…”
The interaction between a planar shock wave and a spherical gas bubble containing sulfur hexafluoride, Refrigerant-22, neon, or helium is studied numerically. Influences of the Atwood number (At) on the evolution of the shock wave and gas bubble are clarified by using highresolution computational simulations. The results show that the difference in the physical properties between the ambient air and the gas bubble has a significant influence on the evolution of wave pattern and bubble deformation. For the fast/slow configuration (At > 0) in the present study (At = 0.67 and 0.51), the incident shock focuses near the interior right interface to form an outward jet. Besides, the mixedness, average vorticity, and the absolute value of circulation all increase as the Atwood number increases. By contrast, for the slow/fast configuration (At < 0) with At = −0.19 and −0.76, the rotational directions of the vorticities formed at the same position are reversed compared with those in the fast/slow configuration, which induces an inward air jet to impact on the gas bubble from the outside. In addition, the mixedness, average vorticity, and the absolute value of circulation all increase as the Atwood number decreases. Nevertheless, regardless of At > 0 or At < 0, the effective volume of the gas bubble basically decreases when the Atwood number decreases. Hence, on the whole, the Atwood number has a nonmonotonic influence on the evolution of effective volume of gas bubble, mixedness, average vorticity, and circulation simultaneously.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
