Flow past a rotating cylinder translating at different gap heights along a wall

A. Rao, M.C. Thompson, T. Leweke, K. Hourigan

Research output: Contribution to journalArticleResearchpeer-review

Abstract

The flow past a rotating circular cylinder translating parallel to a wall at different heights is investigated for Reynolds numbers up to 400 for three discrete rotation rates. In particular, the various wake transitions that occur as a function of gap height are quantified for the three cases examined: non-rotation, and forward and reverse rotations. At low gap heights, only a single steady three-dimensional mode is found to become unstable on the steady base flow. As the gap height is increased, several new three-dimensional modes are observed, of which one attains large amplitudes in the near wake and another preferentially in the far wake. At still larger gap heights, the transition sequence resembles that observed in a rotating cylinder wake, for which the wake first undergoes transition to a periodic state, prior to the onset of three-dimensional flow. Parameter space maps showing the neutral stability curves and regions of instability for each mode are presented for each rotation rate, together with a discussion of the spatio-temporal characteristics and spatial distributions of the new modes. Finally, the force coefficients for the steady and periodic two-dimensional base flows are presented
Original languageEnglish
Pages (from-to)314 - 330
Number of pages17
JournalJournal of Fluids and Structures
Volume57
DOIs
Publication statusPublished - 2015

Cite this

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title = "Flow past a rotating cylinder translating at different gap heights along a wall",
abstract = "The flow past a rotating circular cylinder translating parallel to a wall at different heights is investigated for Reynolds numbers up to 400 for three discrete rotation rates. In particular, the various wake transitions that occur as a function of gap height are quantified for the three cases examined: non-rotation, and forward and reverse rotations. At low gap heights, only a single steady three-dimensional mode is found to become unstable on the steady base flow. As the gap height is increased, several new three-dimensional modes are observed, of which one attains large amplitudes in the near wake and another preferentially in the far wake. At still larger gap heights, the transition sequence resembles that observed in a rotating cylinder wake, for which the wake first undergoes transition to a periodic state, prior to the onset of three-dimensional flow. Parameter space maps showing the neutral stability curves and regions of instability for each mode are presented for each rotation rate, together with a discussion of the spatio-temporal characteristics and spatial distributions of the new modes. Finally, the force coefficients for the steady and periodic two-dimensional base flows are presented",
author = "A. Rao and M.C. Thompson and T. Leweke and K. Hourigan",
year = "2015",
doi = "10.1016/j.jfluidstructs.2015.06.015",
language = "English",
volume = "57",
pages = "314 -- 330",
journal = "Journal of Fluids and Structures",
issn = "0889-9746",
publisher = "Elsevier",

}

Flow past a rotating cylinder translating at different gap heights along a wall. / Rao, A.; Thompson, M.C.; Leweke, T.; Hourigan, K.

In: Journal of Fluids and Structures, Vol. 57, 2015, p. 314 - 330.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Flow past a rotating cylinder translating at different gap heights along a wall

AU - Rao, A.

AU - Thompson, M.C.

AU - Leweke, T.

AU - Hourigan, K.

PY - 2015

Y1 - 2015

N2 - The flow past a rotating circular cylinder translating parallel to a wall at different heights is investigated for Reynolds numbers up to 400 for three discrete rotation rates. In particular, the various wake transitions that occur as a function of gap height are quantified for the three cases examined: non-rotation, and forward and reverse rotations. At low gap heights, only a single steady three-dimensional mode is found to become unstable on the steady base flow. As the gap height is increased, several new three-dimensional modes are observed, of which one attains large amplitudes in the near wake and another preferentially in the far wake. At still larger gap heights, the transition sequence resembles that observed in a rotating cylinder wake, for which the wake first undergoes transition to a periodic state, prior to the onset of three-dimensional flow. Parameter space maps showing the neutral stability curves and regions of instability for each mode are presented for each rotation rate, together with a discussion of the spatio-temporal characteristics and spatial distributions of the new modes. Finally, the force coefficients for the steady and periodic two-dimensional base flows are presented

AB - The flow past a rotating circular cylinder translating parallel to a wall at different heights is investigated for Reynolds numbers up to 400 for three discrete rotation rates. In particular, the various wake transitions that occur as a function of gap height are quantified for the three cases examined: non-rotation, and forward and reverse rotations. At low gap heights, only a single steady three-dimensional mode is found to become unstable on the steady base flow. As the gap height is increased, several new three-dimensional modes are observed, of which one attains large amplitudes in the near wake and another preferentially in the far wake. At still larger gap heights, the transition sequence resembles that observed in a rotating cylinder wake, for which the wake first undergoes transition to a periodic state, prior to the onset of three-dimensional flow. Parameter space maps showing the neutral stability curves and regions of instability for each mode are presented for each rotation rate, together with a discussion of the spatio-temporal characteristics and spatial distributions of the new modes. Finally, the force coefficients for the steady and periodic two-dimensional base flows are presented

UR - http://www.sciencedirect.com/science/article/pii/S0889974615001541

U2 - 10.1016/j.jfluidstructs.2015.06.015

DO - 10.1016/j.jfluidstructs.2015.06.015

M3 - Article

VL - 57

SP - 314

EP - 330

JO - Journal of Fluids and Structures

JF - Journal of Fluids and Structures

SN - 0889-9746

ER -