Modification of a convective internal boundary layer (IBL) by spanwise motion of a warm surface is investigated by imposing different surface moving speeds in the present study. Our analysis shows that the spanwise surface motion reduces the Reynolds shear stress right after the increase in the surface temperature in the convective IBL. The maximum decreasing rate of the Reynolds shear stress is found to be approximately 75% at the largest moving speed of the warm surface considered in the manuscript. Due to the reduction of the Reynolds shear stress, the vertical momentum transport is fundamentally altered, and the mean flow accelerates immediately after the increase in the surface temperature. By scrutinizing the instantaneous and conditional averaged flow fields as well as the pre-multiplied energy spectra, we have attributed the reduction of the Reynolds shear stress to the suppression of the near-surface velocity streaks and quasi-streamwise vortices, and the delayed growth of the convective structures, such as thermal plumes. Our investigation suggests that the developments of the convective IBL can be influenced by a strong spanwise motion of the warm surface, which should be taken into consideration in the prediction model for practical applications.
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November 2022
Research Article|
November 16 2022
Mechanistic study on modification of convective internal boundary layer by spanwise surface motion
Special Collection:
Centennial of the Kármán-Pohlhausen Momentum-Integral Approach
Ming-Xiang Zhao (赵明翔)
;
Ming-Xiang Zhao (赵明翔)
a)
(Conceptualization, Formal analysis, Investigation, Supervision, Writing – original draft, Writing – review & editing)
Beijing Institute of Space Launch Technology
, Beijing 100076, China
a)Author to whom correspondence should be addressed: zhaomx15@tsinghua.org.cn
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Dandan Yang (杨丹丹)
Dandan Yang (杨丹丹)
(Investigation, Validation, Writing – original draft, Writing – review & editing)
Beijing Institute of Space Launch Technology
, Beijing 100076, China
Search for other works by this author on:
a)Author to whom correspondence should be addressed: zhaomx15@tsinghua.org.cn
Note: This paper is part of the special topic, Centennial of the Kármán-Pohlhausen Momentum-Integral Approach.
Physics of Fluids 34, 115145 (2022)
Article history
Received:
September 08 2022
Accepted:
October 30 2022
Citation
Ming-Xiang Zhao, Dandan Yang; Mechanistic study on modification of convective internal boundary layer by spanwise surface motion. Physics of Fluids 1 November 2022; 34 (11): 115145. https://doi.org/10.1063/5.0124832
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