A criterion for identifying strong flow regions in turbulence

J.M.J. Toonder, den, G.D.C. Kuiken, F.T.M. Nieuwstadt

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5 Citations (Scopus)

Abstract

We propose a new criterion for identifying strong flow regions in turbulence. This criterion may also be used as a first approximation to characterise where and when dissolved polymer molecules may become deformed by a turbulent flow, which is, for example, important for drag reduction. In arriving at the new criterion, we first review several existing criteria for identifying strong flow regions. They have the disadvantage of being either not objective or hard to compute with good accuracy. The new criterion, which depends on the second and third invariant of the rate-of-strain tensor, does not suffer from these disadvantages. After an analysis of the criterion and a comparison with an existing criterion using a simulated turbulent pipe flow, we conclude that it is indeed suitable for identifying strong flows. Finally, we show that the criterion is related to enstrophy production, and thus may also have some dynamical relevance.
Original languageEnglish
Pages (from-to)735-753
JournalEuropean Journal of Mechanics. B, Fluids
Volume15
Publication statusPublished - 1996

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Turbulence
turbulence
Turbulent Flow
Drag Reduction
Pipe Flow
drag reduction
pipe flow
turbulent flow
vorticity
Polymers
Tensor
Molecules
tensors
Invariant
polymers
Approximation
approximation
molecules

Cite this

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A criterion for identifying strong flow regions in turbulence. / Toonder, den, J.M.J.; Kuiken, G.D.C.; Nieuwstadt, F.T.M.

In: European Journal of Mechanics. B, Fluids, Vol. 15, 1996, p. 735-753.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - A criterion for identifying strong flow regions in turbulence

AU - Toonder, den, J.M.J.

AU - Kuiken, G.D.C.

AU - Nieuwstadt, F.T.M.

PY - 1996

Y1 - 1996

N2 - We propose a new criterion for identifying strong flow regions in turbulence. This criterion may also be used as a first approximation to characterise where and when dissolved polymer molecules may become deformed by a turbulent flow, which is, for example, important for drag reduction. In arriving at the new criterion, we first review several existing criteria for identifying strong flow regions. They have the disadvantage of being either not objective or hard to compute with good accuracy. The new criterion, which depends on the second and third invariant of the rate-of-strain tensor, does not suffer from these disadvantages. After an analysis of the criterion and a comparison with an existing criterion using a simulated turbulent pipe flow, we conclude that it is indeed suitable for identifying strong flows. Finally, we show that the criterion is related to enstrophy production, and thus may also have some dynamical relevance.

AB - We propose a new criterion for identifying strong flow regions in turbulence. This criterion may also be used as a first approximation to characterise where and when dissolved polymer molecules may become deformed by a turbulent flow, which is, for example, important for drag reduction. In arriving at the new criterion, we first review several existing criteria for identifying strong flow regions. They have the disadvantage of being either not objective or hard to compute with good accuracy. The new criterion, which depends on the second and third invariant of the rate-of-strain tensor, does not suffer from these disadvantages. After an analysis of the criterion and a comparison with an existing criterion using a simulated turbulent pipe flow, we conclude that it is indeed suitable for identifying strong flows. Finally, we show that the criterion is related to enstrophy production, and thus may also have some dynamical relevance.

M3 - Article

VL - 15

SP - 735

EP - 753

JO - European Journal of Mechanics. B, Fluids

JF - European Journal of Mechanics. B, Fluids

SN - 0997-7546

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