Hierarchy of antiparallel vortex tubes in spatially periodic turbulence at high Reynolds numbers

Goto, Susumu; Saito, Yuta; Kawahara, Genta

Physical Review Fluids, 2017, 2(6), 064603

Number of Access:368（2025-08-29 08:17 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/100049

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Title
Hierarchy of antiparallel vortex tubes in spatially periodic turbulence at high Reynolds numbers
Creator
NRID
1000040321616 1000040321616
ORCID
0000-0001-7013-7967 0000-0001-7013-7967
researchmap permalink
read0193841 read0193841
Scopus Author ID
56040611400 56040611400
CreatorName
Goto, Susumu
CreatorName
Saito, Yuta
NRID
1000050214672 1000050214672
researchmap permalink
read0094385 read0094385
CreatorName
Kawahara, Genta
Description
Goto S., Saito Y., Kawahara G. Hierarchy of antiparallel vortex tubes in spatially periodic turbulence at high Reynolds numbers. Physical Review Fluids 2, 064603 (2017); https://doi.org/10.1103/PhysRevFluids.2.064603.
Abstract
To draw a precise picture of the hierarchy of coherent vortices in spatially periodic turbulence at high Reynolds numbers and to understand its generation mechanism, we conduct direct numerical simulations of turbulence in a periodic cube. By objectively identifying the axes of vortex tubes at various length scales in the inertial range, we quantitatively show that the sustained turbulence consists of a hierarchy of antiparallel pairs of vortex tubes. These vortex tubes are created by being stretched in strain fields around 2-8 times larger vortices, whereas they are weakened by strain around half-scale vortices. Temporal tracking of identified vortex tubes shows that they tend to form antiparallel pairs from the moment they are created. We examine three different external forces to show that the hierarchical structure of antiparallel vortex pairs is robust and its statistical features in inertial length scales are independent of the force. The turbulence that is sustained by steady forces is quasiperiodic in time and its significant temporal fluctuations are caused by successive creation of strong vortex tubes within the hierarchy.
Publisher
American Physical Society
Source Title
Physical Review Fluids
Volume (Issue)
2(6)
Page
064603
Date of Issued
2017-06-06
Language
English
Handle URL
https://hdl.handle.net/11094/100049
eISSN
2469990X
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1103/PhysRevFluids.2.064603
Access Rights
open access
CopyRight
Copyright 2017 by the American Physical Society
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Version of Record
Category
学術雑誌論文 Journal Article