LI Junyang; ZHOU Qingqing; SUN Dong; YU Ming; YUAN Xianxu; LIU Pengxin

doi:10.7498/aps.74.20250783

Abstract

In this study, a clustering method is used to extract the coherent structures associated with intense streamwise velocity fluctuations and temperature fluctuations in high-speed turbulent channel flow. Based on their spatial locations, these structures are categorized into wall-attached type and wall-detached type. A subset of the wall-attached structures exhibits self-similarity in scale, consistent with Townsend (1976)’s attached eddy hypothesis, and these structures are further classified as squat structure, self-similar structure, and tall structure. Conditional averaging results indicate that the streamwise Reynolds normal stress and the intensity of temperature fluctuations follow a logarithmic law in the logarithmic layer, a phenomenon that aligns with the attached eddy hypothesis; meanwhile, the strong Reynolds analogy relationship between velocity and temperature fluctuations remains valid within these attached structures. Analysis based on the RD (Renard-Deck) identity decomposition reveals that tall structures related to low streamwise momentum mainly control the generation of wall friction and heat flux, while tall structures related to high-temperature events play a main role in the of wall-normal heat flux transfer.

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Authors and contacts

Corresponding author: LI Junyang, lijunyang@cardc.cn ; LIU Pengxin, liupengxin@cardc.cn

Funds: Project supported by the Young Talent Lifting Project, China and the National Natural Science Foundation of China (Grant No. 12272396).

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算例	${{{T_{\text{w}}}} \mathord{\left/ {\vphantom {{{T_{\text{w}}}} {{T_{\text{r}}}}}} \right. } {{T_{\text{r}}}}}$	$R{e_\tau }$	${M_{\text{b}}}$	${M_{\text{c}}}$	$\Delta {x^ + }$	$\Delta y_{\text{w}}^ + $	$\Delta {z^ + }$
M8 AW	1.0	504	4.44	6.93	5.5	0.50	2.7
M8 CW05	0.5	450	4.61	6.15	4.8	0.46	2.4
M8 CW02	0.2	540	4.79	6.03	9.9	0.59	2.9

DownLoad: CSV

Case	$ \text{N, ss} $	$ \text{N, s} $	$ \text{N, t} $	$ \text{P, ss} $	$ \text{P, s} $	$ \text{P, t} $	Total
M8 AW	3.22	0.32	6.26	1.88	1.35	5.40	42.11
M8 CW05	3.71	0.13	7.10	1.66	1.27	3.70	38.84
M8 CW02	2.21	0.15	9.61	2.01	0.73	2.70	37.20

DownLoad: CSV

Case	$ \mathit{\text{N, ss}} $	$ \text{N, s} $	$ \text{N, t} $	$ \text{P, ss} $	$ \text{P, s} $	$ \text{P, t} $	Total
M8 CW05	6.66	0.16	14.24	2.33	1.38	6.32	69.21
M8 CW02	3.00	0.10	14.19	2.09	0.58	3.40	50.56

DownLoad: CSV

Case	$ \text{N, ss} $	$ \text{N, s} $	$ \text{N, t} $	$ \text{P, ss} $	$ \text{P, s} $	$ \text{P, t} $	Total
M8CW05	–0.21	0.33	–0.62	–0.36	0.11	–3.00	–24.95
M8CW02	0.00	0.93	–0.24	–0.01	0.08	–1.22	–8.08

DownLoad: CSV

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Vol. 74, Issue 20 - 2025-10-20

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