Merging and auto-generation of vortices in wall bounded flows

Manu Goudar Vishwanathappa; Wim-Paul Breugem; Gerrit Elsinga

Merging and auto-generation of vortices in wall bounded flows

Manu Goudar Vishwanathappa, Wim-Paul Breugem, Gerrit Elsinga

Fluid Mechanics

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

2 Citations (Scopus)

40 Downloads (Pure)

Abstract

For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the interaction of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial streamwise spacing between them. The numerical procedure followed is similar to Zhou et al. (1999). The two eddies were found to merge into a single stronger
eddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial streamwise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies.

Original language	English
Title of host publication	Proceedings 8th International Symposium on Turbulence and Shear Flow Phenomena
Editors	AV Johansson, R Friedrich, S Tavoularis
Place of Publication	Munich, Germany
Publisher	Technical University of Munich
Pages	1-6
Publication status	Published - 2013
Event	TSFP-8, Poitiers, France - Munich, Germany Duration: 28 Aug 2013 → 30 Aug 2013

Publication series

Name
Publisher	Technical University of Munich

Conference

Conference	TSFP-8, Poitiers, France
Period	28/08/13 → 30/08/13

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Cite this

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title = "Merging and auto-generation of vortices in wall bounded flows",

abstract = "For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the interaction of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial streamwise spacing between them. The numerical procedure followed is similar to Zhou et al. (1999). The two eddies were found to merge into a single strongereddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial streamwise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies.",

author = "{Goudar Vishwanathappa}, Manu and Wim-Paul Breugem and Gerrit Elsinga",

year = "2013",

language = "English",

publisher = "Technical University of Munich",

pages = "1--6",

editor = "AV Johansson and R Friedrich and S Tavoularis",

booktitle = "Proceedings 8th International Symposium on Turbulence and Shear Flow Phenomena",

note = "TSFP-8, Poitiers, France ; Conference date: 28-08-2013 Through 30-08-2013",

}

Merging and auto-generation of vortices in wall bounded flows. / Goudar Vishwanathappa, Manu; Breugem, Wim-Paul ; Elsinga, Gerrit.
Proceedings 8th International Symposium on Turbulence and Shear Flow Phenomena. ed. / AV Johansson; R Friedrich; S Tavoularis. Munich, Germany: Technical University of Munich, 2013. p. 1-6.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Merging and auto-generation of vortices in wall bounded flows

AU - Goudar Vishwanathappa, Manu

AU - Breugem, Wim-Paul

AU - Elsinga, Gerrit

PY - 2013

Y1 - 2013

N2 - For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the interaction of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial streamwise spacing between them. The numerical procedure followed is similar to Zhou et al. (1999). The two eddies were found to merge into a single strongereddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial streamwise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies.

AB - For channel flow, we explore how a hairpin eddy may reach a threshold strength required to produce additional hairpins by means of auto-generation. This is done by studying the interaction of two eddies with different initial strengths (but both below the threshold strength), initial sizes and initial streamwise spacing between them. The numerical procedure followed is similar to Zhou et al. (1999). The two eddies were found to merge into a single strongereddy in case of a larger upstream and a smaller downstream eddy placed within a certain initial streamwise separation distance. Subsequently, the resulting stronger eddy was observed to auto-generate new eddies. Merging of eddies thus is a viable explanation for the creation of the threshold strength eddies.

UR - http://resolver.tudelft.nl/uuid:3a597fae-87d4-4f84-b60c-2462fd208de5

M3 - Conference contribution

SP - 1

EP - 6

BT - Proceedings 8th International Symposium on Turbulence and Shear Flow Phenomena

A2 - Johansson, AV

A2 - Friedrich, R

A2 - Tavoularis, S

PB - Technical University of Munich

CY - Munich, Germany

T2 - TSFP-8, Poitiers, France

Y2 - 28 August 2013 through 30 August 2013

ER -

Merging and auto-generation of vortices in wall bounded flows

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