Auto-generation by interaction of weak eddies

Manu Goudar Vishwanathappa, Wim-Paul Breugem, Yoshi Jodai, Gerrit Elsinga

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

For channel flow, we explore how the interaction of weak eddies produces additional eddies by means of auto-generation. This is done by DNS of two eddies with different initial strengths, initial sizes and initial stream-wise spacing between them. The numerical procedure followed is similar to Zhou et al[1]. The two eddies merge into a single stronger eddy when a larger upstream and a smaller downstream eddy are placed within a certain initial stream-wise separation distance. Subsequently, the resulting stronger eddy is observed to auto-generate new eddies. The non-merging cases with small initial stream wise separation also auto-generate. The auto-generation is characterized by a rapid lift-up of an initial eddy, which blocks the incoming flow and leads to shear- layer roll-up and formation of a new eddy. The same sequence of events is observed in a fully developed turbulent boundary layer[2].
Original languageEnglish
Title of host publicationProceedings of the 24th International Congress of Theoretical and Applied Mechanics
EditorsJ.M. Floryan, V. Tvergaard, D. van Campen
Number of pages2
Publication statusPublished - 2016
Event24th International Congress of Theoretical and Applied Mechanics (ICTAM) - Montreal, Canada
Duration: 21 Aug 201626 Aug 2016
Conference number: 24

Conference

Conference24th International Congress of Theoretical and Applied Mechanics (ICTAM)
Abbreviated titleICTAM 2016
CountryCanada
CityMontreal
Period21/08/1626/08/16

Keywords

  • auto-generation
  • boundary layers

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