Optimal transient growth in turbulent pipe flow

Yang SONG, Chunxiao XU, Weixi HUANG, Guixiang CUI

doi:10.1007/s10483-015-1963-7

Applied Mathematics and Mechanics >

2015 , Vol. 36 >Issue 8: 1057 - 1072

DOI: https://doi.org/10.1007/s10483-015-1963-7

Articles

Optimal transient growth in turbulent pipe flow

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Key Laboratory of Applied Mechanics, Department of Engineering Mechanics, Tsinghua University, Beijing 100084, China

Received date: 2014-09-14

Revised date: 2014-12-05

Online published: 2015-08-01

Supported by

Project supported by the National Natural Science Foundation of China (Nos. 11322221, 11132005, and 11490551)

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Abstract

The optimal transient growth process of perturbations driven by the pressure gradient is studied in a turbulent pipe flow. A new computational method is proposed, based on the projection operators which project the governing equations onto the subspace spanned by the radial vorticity and radial velocity. The method is validated by comparing with the previous studies. Two peaks of the maximum transient growth amplification curve are found at different Reynolds numbers ranging from 20 000 to 250 000. The optimal flow structures are obtained and compared with the experiments and DNS results. The location of the outer peak is at the azimuthal wave number n=1, while the location of the inner peak is varying with the Reynolds number. It is observed that the velocity streaks in the buffer layer with a spacing of 100δ_v are the most amplified flow structures. Finally, we consider the optimal transient growth time and its dependence on the azimuthal wave length. It shows a self-similar behavior for perturbations of different scales in the optimal transient growth process.

Key words： optimal transient growth; coherent structure; turbulent pipe flow

Cite this article

Yang SONG, Chunxiao XU, Weixi HUANG, Guixiang CUI . Optimal transient growth in turbulent pipe flow[J]. Applied Mathematics and Mechanics, 2015 , 36(8) : 1057 -1072 . DOI: 10.1007/s10483-015-1963-7

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