Multiple-contour-dynamic simulation of eddy scales in the plane shear layer

Jacobs P.A. and Pullin D.I. (1989) Multiple-contour-dynamic simulation of eddy scales in the plane shear layer. Journal of Fluid Mechanics, 199 89-124. doi:10.1017/S0022112089000303

Author Jacobs P.A.
Pullin D.I.
Title Multiple-contour-dynamic simulation of eddy scales in the plane shear layer
Journal name Journal of Fluid Mechanics   Check publisher's open access policy
ISSN 1469-7645
Publication date 1989
Sub-type Article (original research)
DOI 10.1017/S0022112089000303
Volume 199
Start page 89
End page 124
Total pages 36
Subject 2210 Mechanical Engineering
2211 Mechanics of Materials
3104 Condensed Matter Physics
2206 Computational Mechanics
3100 Physics and Astronomy
Abstract The method of contour dynamics (CD) is applied to several inviscid prototype flows typical of the motions found in the transition region of the free shear layer. Examples of the interaction between the fundamental stream wise-layer perturbation and its first subharmonic are presented that illustrate the events of pairing and tearing of two rolled-up cores and also the coalescence of three rolled-up cores. The present simulations of the temporally unstable two-dimensional layer, at effectively infinite Reynolds number, support the hypothesis that the dynamics of the large-scale roll-up is only weakly dependent on Reynolds number. However, we find fine-scale structure that is not apparent in previous simulations at moderate Reynolds number. Spiral filaments of rotational fluid wrap around the rolled-up vortex cores producing ‘spiky’ vorticity distributions together with the entanglement of large quantities of irrotational fluid into the layer. Simulations proceeded only until the first such event because we were unable to resolve the fine detail generated subsequently. The inclusion of prescribed vortex stretching parallel to the vortex lines is found to accelerate the initial roll-up and to enhance the production of spiral vortex filaments. In the fundamental-subharmonic interaction, vortex stretching slows but does not prevent pairing.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
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Citation counts: Scopus Citation Count Cited 7 times in Scopus Article | Citations
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Created: Tue, 14 Jun 2016, 01:31:39 EST by System User