›› 2015, Vol. 24 ›› Issue (1): 15202-015202.doi: 10.1088/1674-1056/24/1/015202

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇    下一篇

Cylindrical effects in weakly nonlinear Rayleigh–Taylor instability

刘万海a b, 马文芳a, 王绪林a   

  1. a Research Center of Computational Physics, Mianyang Normal University, Mianyang 621000, China;
    b HEDPS and CAPT, Peking University, Beijing 100871, China
  • 收稿日期:2014-04-01 修回日期:2014-05-13 出版日期:2015-01-05 发布日期:2015-01-05
  • 基金资助:
    Project supported by the National Basic Research Program of China (Grant No. 10835003), the National Natural Science Foundation of China (Grant No. 11274026), the Scientific Research Foundation of Mianyang Normal University, China (Grant Nos. QD2014A009 and 2014A02), and the National High-Tech ICF Committee.

Cylindrical effects in weakly nonlinear Rayleigh–Taylor instability

Liu Wan-Hai (刘万海)a b, Ma Wen-Fang (马文芳)a, Wang Xu-Lin (王绪林)a   

  1. a Research Center of Computational Physics, Mianyang Normal University, Mianyang 621000, China;
    b HEDPS and CAPT, Peking University, Beijing 100871, China
  • Received:2014-04-01 Revised:2014-05-13 Online:2015-01-05 Published:2015-01-05
  • Contact: Wang Xu-Lin E-mail:wxln177@163.com
  • Supported by:
    Project supported by the National Basic Research Program of China (Grant No. 10835003), the National Natural Science Foundation of China (Grant No. 11274026), the Scientific Research Foundation of Mianyang Normal University, China (Grant Nos. QD2014A009 and 2014A02), and the National High-Tech ICF Committee.

摘要: The classical Rayleigh-Taylor instability (RTI) at the interface between two variable density fluids in the cylindrical geometry is explicitly investigated by the formal perturbation method up to the second order. Two styles of RTI, convergent (i.e., gravity pointing inward) and divergent (i.e., gravity pointing outwards) configurations, compared with RTI in Cartesian geometry, are taken into account. Our explicit results show that the interface function in the cylindrical geometry consists of two parts: oscillatory part similar to the result of the Cartesian geometry, and non-oscillatory one contributing nothing to the result of the Cartesian geometry. The velocity resulting only from the non-oscillatory term is followed with interest in this paper. It is found that both the convergent and the divergent configurations have the same zeroth-order velocity, whose magnitude increases with the Atwood number, while decreases with the initial radius of the interface or mode number. The occurrence of non-oscillation terms is an essential character of the RTI in the cylindrical geometry different from Cartesian one.

关键词: cylindrical effect, Rayleigh-Taylor instability, variable density fluid

Abstract: The classical Rayleigh-Taylor instability (RTI) at the interface between two variable density fluids in the cylindrical geometry is explicitly investigated by the formal perturbation method up to the second order. Two styles of RTI, convergent (i.e., gravity pointing inward) and divergent (i.e., gravity pointing outwards) configurations, compared with RTI in Cartesian geometry, are taken into account. Our explicit results show that the interface function in the cylindrical geometry consists of two parts: oscillatory part similar to the result of the Cartesian geometry, and non-oscillatory one contributing nothing to the result of the Cartesian geometry. The velocity resulting only from the non-oscillatory term is followed with interest in this paper. It is found that both the convergent and the divergent configurations have the same zeroth-order velocity, whose magnitude increases with the Atwood number, while decreases with the initial radius of the interface or mode number. The occurrence of non-oscillation terms is an essential character of the RTI in the cylindrical geometry different from Cartesian one.

Key words: cylindrical effect, Rayleigh-Taylor instability, variable density fluid

中图分类号:  (Implosion symmetry and hydrodynamic instability (Rayleigh-Taylor, Richtmyer-Meshkov, imprint, etc.))

  • 52.57.Fg
47.20.Ma (Interfacial instabilities (e.g., Rayleigh-Taylor)) 52.35.Py (Macroinstabilities (hydromagnetic, e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor, etc.)) 52.65.Vv (Perturbative methods)