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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2008.9
- 수록면
- 720 - 727 (8page)
이용수
초록· 키워드
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Time delay effects on near-wall turbulent structures are investigated by performing a large-eddy simulation of a transient turbulent flow in a pipe. To elucidate the time delay effects on the near-wall turbulence, we selected the dimensionless acceleration parameter which was used in the previous study. Various turbulent statistics revealed the distinctive features of the delay. It was shown that the dynamic Smagorinsky model is valid to capture the alterations of the turbulence physics well. A dimensionless time for the responses of the flow quantities was introduced to give the detailed information on the delay of the nearwall turbulence. The conditionally-averaged flow fields associated with Reynolds shear stress producing events show that sweep and ejections are closely related to the delays of the turbulence production and the turbulence propagation toward the pipe center. The present study suggested that the enhanced anisotropy of the turbulence in the initial and transient stages would be a challenging problem to standard turbulence models.
목차
Abstract
1. 서론
2. 수치적 방법
3. 수치 결과
4. 결론
후기
참고문헌
참고문헌 (19)
참고문헌 신청
1. [학술지(정기간행물)] - Mizushina, T / 1973 / Pulsating Turbulent Flow in a Tube / J. Chem. Engng 6 : 487 ~ 494
2. [학술지(정기간행물)] - Ramaprian, B.R / 1983 / Fully Developed Periodic Turbulent Pipe Flow-Part 2. The Detailed Structure of the Flow / J. Fluid Mech 137 : 59 ~ 81
3. [학술지(정기간행물)] - Shemer, L / 1985 / Pulsating Flow in a Tube / J. Fluid Mech 153 : 313 ~ 337
4. [학술지(정기간행물)] - Tardu, S.F / 1994 / Turbulent Channel Flow with Large Amplitude / J. Fluid Mech 269 : 109 ~ 151
5. [학술지(정기간행물)] - Scotti, A / 2001 / Numerical Simulation of Pulsating Turbulent Channel Flow / Phys. Fluids 13 : 1367 ~ 1384
2. [학술지(정기간행물)] - Ramaprian, B.R / 1983 / Fully Developed Periodic Turbulent Pipe Flow-Part 2. The Detailed Structure of the Flow / J. Fluid Mech 137 : 59 ~ 81
3. [학술지(정기간행물)] - Shemer, L / 1985 / Pulsating Flow in a Tube / J. Fluid Mech 153 : 313 ~ 337
4. [학술지(정기간행물)] - Tardu, S.F / 1994 / Turbulent Channel Flow with Large Amplitude / J. Fluid Mech 269 : 109 ~ 151
5. [학술지(정기간행물)] - Scotti, A / 2001 / Numerical Simulation of Pulsating Turbulent Channel Flow / Phys. Fluids 13 : 1367 ~ 1384
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