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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 대한기계학회 Journal of Mechanical Science and Technology Journal of Mechanical Science and Technology Vol.19 No.8
- 발행연도
- 2005.8
- 수록면
- 1,682 - 1,691 (10page)
이용수
초록· 키워드
오류제보하기
Direct numerical simulation database of an axial turbulent boundary layer is used to compute frequency and wave number spectra of the wall shear-stress fluctuations in a low-Reynolds number axial turbulent boundary layer. One-dimensional and two-dimensional power spectra of flow variables are calculated and compared. At low wave numbers and frequencies, the power of stream wise shear stress is larger than that of span wise shear stress, while the powers of both stresses are almost the same at high wave numbers and frequencies. The frequency/streamwise wave number spectra of the wall flow variables show that large-scale fluctuations to the rms value is largest for the stream wise shear stress, while that of small-scale fluctuations to the rms value is largest for pressure. In the two-point auto-correlations, negative correlation occurs in stream wise separations for pressure, and in span wise correlation for both shear stresses.
목차
Abstract
Nomenclature
1. Introduction
2. Numerical Method
3. Computation of the Frequency spectrum
4. Power Spectra
5. Summary
Acknowledgments
References
참고문헌 (12)
참고문헌 신청
Blake, W. K., 1986, Mechanics of Flow-Induced Sound and Vibration, Academic, London.
Choi, H. and Moin, P., 1990, "On the Space-Time Characteristics of the Wall Pressure Fluctuations," Phys. Fluids A, 2, pp.1450~1460.
Farabee, T. M. and Casarella, M. J., 1991, "Spectral Freatures of Wall Pressure Fluctuations Beneath Turbulent Boundary Layer," Phys. Fluids A, 5, pp. 2410~2420.
Jean, S., Choi, H., Yoo, J. and Main, P., 1999, "Space-Time Characteristics of the Wall Shear-Stress Fluctuations in a Low-Reynolds-Number Channel Flow," Phys. Fluids A, 11, pp.3084~3094.
Keith, W. L. and Bennett, J. C., 1991, "Low Frequency Spectra of the Wall Shear Stress and Wall Pressure in a Turbulent Boundary-Layer," AIAA J., Vol.29, pp.526~530.
Choi, H. and Moin, P., 1990, "On the Space-Time Characteristics of the Wall Pressure Fluctuations," Phys. Fluids A, 2, pp.1450~1460.
Farabee, T. M. and Casarella, M. J., 1991, "Spectral Freatures of Wall Pressure Fluctuations Beneath Turbulent Boundary Layer," Phys. Fluids A, 5, pp. 2410~2420.
Jean, S., Choi, H., Yoo, J. and Main, P., 1999, "Space-Time Characteristics of the Wall Shear-Stress Fluctuations in a Low-Reynolds-Number Channel Flow," Phys. Fluids A, 11, pp.3084~3094.
Keith, W. L. and Bennett, J. C., 1991, "Low Frequency Spectra of the Wall Shear Stress and Wall Pressure in a Turbulent Boundary-Layer," AIAA J., Vol.29, pp.526~530.
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