Oscillatory instability of a 3D natural convection flow around a tandem of cold and hot vertically aligned cylinders placed inside a cold cubic enclosure

Avihai Spizzichino, Efi Zemach, Yuri Feldman

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The oscillatory instability of a 3D natural convection flow in a cold cubic enclosure containing a tandem of cold and hot vertically aligned cylinders is investigated in detail as a function of the distance between the cylinders. The study is performed by applying time integration of slightly supercritical flows. The flows undergo a transition to unsteadiness via either reflectional symmetry breaking or reflectional symmetry preserving Hopf bifurcation as a function of the distance between the cylinders. An extensive discussion of the observed instability scenarios is presented, and the different instability mechanisms are characterized in terms of the values of the main oscillating harmonics and the spatial distribution of the oscillating amplitudes of all the fields obtained for slightly supercritical flows.

Original languageEnglish
Pages (from-to)327-345
Number of pages19
JournalInternational Journal of Heat and Mass Transfer
Volume141
DOIs
StatePublished - 1 Oct 2019

Keywords

  • Hopf bifurcation
  • Oscillatory instability
  • Reflectional symmetry breaking
  • Supercritical flow

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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