dorsal/arxiv
View SchemaDynamics of propagating turbulent pipe flow structures. Part II: Relaminarization
| Authors | A. Duggleby, K. S. Ball, M. R. Paul |
|---|---|
| Categories | |
| ArXiv ID | physics/0608259 |
| URL | https://arxiv.org/abs/physics/0608259 |
Abstract
The dynamical behavior of propagating structures, determined from a Karhunen-Lo`eve decomposition, in turbulent pipe flow undergoing reverse transition to laminar flow is investigated. The turbulent flow data is generated by a direct numerical simulation started at a fully turbulent Reynolds number of Re_\tau=150, which is slowly decreased until Re_\tau=95. At this low Reynolds number the high frequency modes decay first, leaving only the decaying streamwise vortices. The flow undergoes a chugging phenomena, where it begins to relaminarize and the mean velocity increases. The remaining propagating modes then destabilize the streamwise vortices, rebuild the energy spectra, and eventually the flow regains its turbulent state. Our results capture three chugging cycles before the flow completely relaminarizes. The high frequency modes present in the outer layer decay first, establishing the importance of the outer region in the self-sustaining mechanism of wall bound turbulence.
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"abstract": "The dynamical behavior of propagating structures, determined from a\nKarhunen-Lo`eve decomposition, in turbulent pipe flow undergoing reverse\ntransition to laminar flow is investigated. The turbulent flow data is\ngenerated by a direct numerical simulation started at a fully turbulent\nReynolds number of Re_\\tau=150, which is slowly decreased until Re_\\tau=95. At\nthis low Reynolds number the high frequency modes decay first, leaving only the\ndecaying streamwise vortices. The flow undergoes a chugging phenomena, where it\nbegins to relaminarize and the mean velocity increases. The remaining\npropagating modes then destabilize the streamwise vortices, rebuild the energy\nspectra, and eventually the flow regains its turbulent state. Our results\ncapture three chugging cycles before the flow completely relaminarizes. The\nhigh frequency modes present in the outer layer decay first, establishing the\nimportance of the outer region in the self-sustaining mechanism of wall bound\nturbulence.",
"arxiv_id": "physics/0608259",
"authors": [
"A. Duggleby",
"K. S. Ball",
"M. R. Paul"
],
"categories": [
"physics.flu-dyn"
],
"title": "Dynamics of propagating turbulent pipe flow structures. Part II: Relaminarization",
"url": "https://arxiv.org/abs/physics/0608259"
},
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