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학술대회자료
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한국가시화정보학회 한국가시화정보학회 학술발표대회 논문집 2007년도 한국가시화정보학회 추계학술대회
발행연도
2007.11
수록면
134 - 137 (4page)

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The temporal evolution of wake behind a circular cylinder oscillating rotationally with a relatively high forcing frequency has been investigated experimentally using a dynamic PIV technique. Experiments were carried out with varying the frequency ratio F<SUB>R</SUB> (=f<SUB>f</SUB>/f<SUB>n</SUB>) in the range from 0.0 (stationary) to 1.6 at oscillation amplitude of θ<SUB>A</SUB>=30° and Reynolds number of R<SUB>e</SUB>=4.14×10³ Depending on the forcing condition (F<SUB>R</SUB>), the flow was divided into three regimes; non-lock-on (F<SUB>R</SUB>=0.4), transition (F<SUB>R</SUB>=0.8, 1.6) and lock-on regimes (F<SUB>R</SUB>=1.0) with markedly different flow structure in the near-wake region behind the cylinder. When the frequency ratio was less than 1.0 (F<SUB>R</SUB>≤ 1.0), the rotational oscillatory motion of the cylinder decreased the length of the vortex formation region and enhanced the mutual interaction between large-scale vortices across the wake centerline. The entrainment of ambient fluid seemed to play an important role in controlling the near-wake flow and shear-layer instability. However, the flow characteristics changed markedly beyond the lock-on flow regime (F<SUB>R</SUB>=1.0) due to high-frequency forcing. At F<SUB>R</SUB>=1.6, the mutual interactions between the vortices shed from both sides of the cylinder were not so strong. Thereby, the flow entrainment and momentum transfer into the wake center region were reduced. In addition, the size of the large-scale vortices decreased since the lateral extent of the wake was suppressed.

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Abstract
1. 서론
2. 실험장치 및 구성
3. 실험결과 및 고찰
4. 결론
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UCI(KEPA) : I410-ECN-0101-2009-505-016150940