Steady flows excited by inertial modes in a librating cylinder

Authors

  • Станислав Валерьевич Субботин (Stanislav V. Subbotin) Perm State Humanitarian Pedagogical University
  • Анастасия Сергеевна Кропачева (Anastasia S. Kropacheva) Perm State Humanitarian Pedagogical University

DOI:

https://doi.org/10.17072/1994-3598-2018-4-67-73

Keywords:

inertial waves, inertial modes, steady flow, rotation, librations

Abstract

Steady flow excited by oscillatory motion of the fluid in a non-uniformly rotating (librating) cylinder is experimentally investigated. Librations lead to the propagation of inertial waves, which are born near the junction of the side and end walls of the cavity. As a result of multiple reflections from the cavity walls, the inertial waves experience a spatial resonance, exciting so-called inertial modes. The latter are a system of vortices in which the direction of rotation of the fluid varies during the period of librations. It is found that the oscillatory motion in the fluid bulk leads to the appearance of intense steady flow in the Stokes boundary layer on the side wall of the cylinder. The flow structure has the form of a system of averaged toroidal vortices located along the entire side cavity wall. The number of vortices is determined by the axial wave number of the excited mode and does not depend on the radial wave number. It is shown that the intensity of the steady flow is proportional to the square of the libration amplitude and strongly depends on the number of the mode.

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Published

2018-12-29

How to Cite

Субботин (Stanislav V. Subbotin) С. В., & Кропачева (Anastasia S. Kropacheva) А. С. (2018). Steady flows excited by inertial modes in a librating cylinder. Bulletin of Perm University. Physics, (4(42). https://doi.org/10.17072/1994-3598-2018-4-67-73

Issue

Section

Regular articles