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    Microscopic Richtmyer-Meshkov instability under strong shock

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    Type
    Article
    Authors
    Sun, Pengyue
    Ding, Juchun cc
    Huang, Shenghong cc
    Luo, Xisheng cc
    Cheng, Wan
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2020-02-24
    Online Publication Date
    2020-02-24
    Print Publication Date
    2020-02-01
    Embargo End Date
    2021-02-24
    Submitted Date
    2019-12-22
    Permanent link to this record
    http://hdl.handle.net/10754/662103
    
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    Abstract
    The microscopic-scale Richtmyer-Meshkov instability (RMI) of a single-mode dense-gas interface is studied by the molecular dynamics approach. Physically realistic evolution processes involving the non-equilibrium effects such as diffusion, dissipation, and thermal conduction are examined for different shock strengths. Different dependence of the perturbation growth on the shock strength is found for the first time. Specifically, the amplitude growths for cases with relatively lower shock Mach numbers (Ma = 1.9, 2.4, 2.9) exhibit an evident discrepancy from a very early stage, whereas for cases with higher Mach numbers (Ma = 4.9, 9.0, 16.0), their amplitude variations with time match quite well during the whole simulation time. Such different behaviors are ascribed to the viscosity effect that plays a crucial role in the microscale RMI. The compressible linear theory of Yang et al. [
    Citation
    Sun, P., Ding, J., Huang, S., Luo, X., & Cheng, W. (2020). Microscopic Richtmyer–Meshkov instability under strong shock. Physics of Fluids, 32(2), 024109. doi:10.1063/1.5143327
    Sponsors
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 11802304, 11625211, and 11621202), the Science Challenging Project (No. TZ2016001), and the National Key R&D Program of China (Grant No. 2016YFC0800100). The numerical calculations in this paper were made on the supercomputing system in the Supercomputing Center of University of Science and Technology of China.
    Publisher
    AIP Publishing
    Journal
    Physics of Fluids
    DOI
    10.1063/1.5143327
    Additional Links
    http://aip.scitation.org/doi/10.1063/1.5143327
    ae974a485f413a2113503eed53cd6c53
    10.1063/1.5143327
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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