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ISSN オンライン: 2642-0554

Inner-scaled turbulent statistics of turbulent pipe flows

Junsun Ahn
Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea

Jae Hwa Lee
Dept. of Mechanical and Nuclear Engineering, UNIST, Ulsan 689-798, Korea; Sch. for Engr. of Matter, Transport & Energy Arizona State University Tempe, AZ 85287-6106, USA

Hyung Jin Sung
Department of Mechanical Engineering, KAIST 291 Daehak-ro, Yuseong-gu, Daejeon 305-701, Korea

要約

Direct numerical simulations (DNSs) of fully developed turbulent pipe flows for Reτ=180, 544, and 934 were performed to investigate the inner-scaled turbulent statistics associated with spatial amplitude modulation (AM). A long streamwise domain length, 30R, was adopted to avoid the domain length effect, which affects on the convergence of turbulence statistics. The present result shows that the near-wall peak in the streamwise turbulence intensity increases with increasing the Reynolds number. This trend is very consistent to turbulent boundary layer (TBL) and channel flows, indicating that there is a universal flow behavior in turbulent canonical flows. Evidence to support this finding is found in pre-multiplied energy spectra and two-point AM covariance. It is determined that both the long wavelength energy near the wall and the non-linear effects of AM contribute to the growth of the near-wall peak in the streamwise turbulence intensity.