Flow characteristics around the oscillating sphere at high Strouhal number using three-dimensional vortex element method

Sang Hwan Lee, Yun Sub Park, Young Taek Cho, Cheol O. Ahn, In Soo Seo

Research output: Contribution to journalArticle

Abstract

In this paper, we investigated the flow of an incompressible viscous fluid past a sphere which is oscillated one-dimensionally over flow regimes including laminar flow at Reynolds number of 100, 200 and Strouhal number of up to 5000. In order to analyze flow and estimate critical Strouhal number, we introduce three-dimensional vortex element method. With this method, separation only appears in decreasing velocity region during the high Strouhal numbers. We find out that vorticity distribution around sphere is proportionl to the Strouhal number. And we can decide that low Strouhal number is below 100, high Strouhal number is above 500 from many results. Thus the critical Strouhal number(St) effected to the flow field is expected to be 100<St<500.

Original languageEnglish
Pages (from-to)421-428
Number of pages8
JournalTransactions of the Korean Society of Mechanical Engineers, B
Volume32
Issue number6
DOIs
StatePublished - 2008 Jun 1

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Strouhal number
Vortex flow
Vorticity
Laminar flow
Flow fields
Reynolds number
Fluids

Keywords

  • Fast algorithm
  • Oscillating sphere
  • Strouhal number
  • Vortex element method

Cite this

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abstract = "In this paper, we investigated the flow of an incompressible viscous fluid past a sphere which is oscillated one-dimensionally over flow regimes including laminar flow at Reynolds number of 100, 200 and Strouhal number of up to 5000. In order to analyze flow and estimate critical Strouhal number, we introduce three-dimensional vortex element method. With this method, separation only appears in decreasing velocity region during the high Strouhal numbers. We find out that vorticity distribution around sphere is proportionl to the Strouhal number. And we can decide that low Strouhal number is below 100, high Strouhal number is above 500 from many results. Thus the critical Strouhal number(St) effected to the flow field is expected to be 100<St<500.",
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Flow characteristics around the oscillating sphere at high Strouhal number using three-dimensional vortex element method. / Lee, Sang Hwan; Park, Yun Sub; Cho, Young Taek; Ahn, Cheol O.; Seo, In Soo.

In: Transactions of the Korean Society of Mechanical Engineers, B, Vol. 32, No. 6, 01.06.2008, p. 421-428.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Flow characteristics around the oscillating sphere at high Strouhal number using three-dimensional vortex element method

AU - Lee, Sang Hwan

AU - Park, Yun Sub

AU - Cho, Young Taek

AU - Ahn, Cheol O.

AU - Seo, In Soo

PY - 2008/6/1

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AB - In this paper, we investigated the flow of an incompressible viscous fluid past a sphere which is oscillated one-dimensionally over flow regimes including laminar flow at Reynolds number of 100, 200 and Strouhal number of up to 5000. In order to analyze flow and estimate critical Strouhal number, we introduce three-dimensional vortex element method. With this method, separation only appears in decreasing velocity region during the high Strouhal numbers. We find out that vorticity distribution around sphere is proportionl to the Strouhal number. And we can decide that low Strouhal number is below 100, high Strouhal number is above 500 from many results. Thus the critical Strouhal number(St) effected to the flow field is expected to be 100<St<500.

KW - Fast algorithm

KW - Oscillating sphere

KW - Strouhal number

KW - Vortex element method

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