| Item type |
共通アイテムタイプ(1) |
| 公開日 |
2025-08-18 |
| タイトル |
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|
タイトル |
A parametric analysis of streamwise vortices on a compression ramp at Mach 4 |
|
言語 |
en |
| 著者 |
Dixit, K.
Kumar, R.R.
Vadlamani, N.R.
坪井, 伸幸
|
| 著作権関連情報 |
|
|
言語 |
en |
|
権利情報Resource |
http://creativecommons.org/licenses/by/4.0/ |
|
権利情報 |
Copyright (c) The Author(s) 2025. Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Large-eddy simulations are conducted to investigate supersonic flow over a compression ramp at a free stream Mach number of 4.0 and a unit Reynolds number of 4.56×106 per meter. Two ramp angles of 15◦ and 18◦ are considered along with three different ramp positions (P1, P2, and P3) from the plate leading edge, with the plate length increasing progressively from P1 to P3. Simulations reveal that with an increase in the plate length and ramp angle, the separation point shifts downstream, accompanied by an extended separation length. Furthermore, with an increase in the ramp angle and plate length, a higher Görtler number is observed upstream of the reattachment indicating a greater likelihood of Görtler instability. In particular, no streamwise vortices were observed for the 15P1 and 15P2 cases, while for the 18P3 case, increased instability resulted in the breakdown of streamwise vortices, driving the transition to turbulence. The wavelength of streamwise streaks decreased by approximately 15% as the plate length increased by ≈ 80% from 18P1 to 18P3. Unsteady analysis revealed the role of spanwise secondary instabilities over these vortices, that trigger turbulent spots that propagate at a speed of ≈ 0.6U∞. The peak value of the Stanton number is found to be ≈ 15–27% higher than the time and span-averaged value for the 15P3 and 18P3 cases, highlighting a strong effect of downwash due to streamwise vortices on the wall heating rate distribution. The unsteady data also reveal a negative correlation between the flow reattachment location and the Stanton number close to the reattachment point. An earlier reattachment is shown to increase the Stanton number and vice versa resulting in a ≈ 40% variation compared to the time-averaged value. The results from this study underscore the critical influence of plate length on the formation of streamwise vortices, with significant implications for wall heating rate distribution and flow transition dynamics. |
|
言語 |
en |
| 書誌情報 |
en : Shock Waves
巻 35,
p. 423-436,
発行日 2025-06-17
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| 出版社 |
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出版者 |
Springer |
|
言語 |
en |
| キーワード |
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言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Large-eddy simulations |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Centrifugal instabilities |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Supersonic flow |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Shock wave–boundary layer interaction |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Streamwise vortices |
| キーワード |
|
|
言語 |
en |
|
主題Scheme |
Other |
|
主題 |
Flow transition |
| 言語 |
|
|
言語 |
eng |
| 資源タイプ |
|
|
資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
|
資源タイプ |
journal article |
| 出版タイプ |
|
|
出版タイプ |
VoR |
|
出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| DOI |
|
|
|
識別子タイプ |
DOI |
|
|
関連識別子 |
https://doi.org/10.1007/s00193-025-01239-z |
| 助成情報 |
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|
助成機関名 |
National PARAM Supercomputing Facility |
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言語 |
en |
| 助成情報 |
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|
助成機関名 |
Indian Institute of Technology Madras |
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言語 |
en |
| 助成情報 |
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|
助成機関識別子タイプ |
Crossref Funder |
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|
助成機関識別子 |
https://doi.org/10.13039/501100002241 |
|
|
助成機関名 |
科学技術振興機構 (JST) |
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言語 |
ja |
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|
助成機関名 |
Japan Science and Technology Agency (JST) |
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|
言語 |
en |
|
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研究課題番号 |
JPMJFS2133 |
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研究課題番号タイプ |
JGN |
| ISSN |
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収録物識別子タイプ |
PISSN |
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収録物識別子 |
0938-1287 |
| ISSN |
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収録物識別子タイプ |
EISSN |
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収録物識別子 |
1432-2153 |
| 研究者情報 |
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URL |
https://hyokadb02.jimu.kyutech.ac.jp/html/20_ja.html |
| 論文ID（連携） |
|
|
値 |
10462771 |
| 連携ID |
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|
値 |
14850 |
10462771.pdf (1.9 MB)
