Direct numerical simulation of turbulent flow around a wall-mounted cube: Spatio-temporal evolution of large-scale vortices

Alexander Yakhot, Tomer Anor, Heping Liu, Nikolay Nikitin

Research output: Contribution to journalArticlepeer-review

50 Scopus citations

Abstract

Flow around a wall-mounted cube is an example of a turbulent flow around a three-dimensional bluff body attached to a surface. The main experimentally observed feature of this type of flow is the appearance of complex vortical structures, e.g. a horseshoe vortex originating in front of the body and enveloping it. The current paper is a follow-up to Yakhot, Liu & Nikitin (2006) in which we presented results of direct numerical simulation (DNS) of turbulent flow around a cube. Here, it is shown that unsteadiness of the considered flow is caused by inviscid-viscous interaction between the horseshoe vortex and the narrow band of positive vorticity attached to the surface in front of the cube. Details of the spatio-temporal evolution of large-scale vortical structures, including samples of long-term visualization and turbulence statistics, are presented. For the normal-to-the-wall velocity, in the vicinity of the cube's front face, the results reveal an anomalous probability distribution, namely, a bimodal distribution and one with high kurtosis.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalJournal of Fluid Mechanics
Volume566
DOIs
StatePublished - 1 Jan 2006

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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