Evaluation of the random sweeping hypothesis for the Reynolds normal stress fluctuation spectra
文献类型：期刊论文
| 作者 | Zhang HY(张慧颖)1; Ning, Dezhi2; Wu T(吴霆)2; He GW(何国威)3,4 |
| 刊名 | PHYSICS OF FLUIDS
 |
| 出版日期 | 2025-04-01 |
| 卷号 | 37期号:4页码:21 |
| ISSN号 | 1070-6631 |
| DOI | 10.1063/5.0265587 |
| 通讯作者 | Wu, Ting(wuting@dlut.edu.cn) |
| 英文摘要 | The space-time spectra of streamwise velocity fluctuations and streamwise Reynolds normal stress (SRNS) fluctuations in turbulent channel flows, as well as the spectral relationships between these two fluctuations based on the random sweeping hypothesis (RSH), are investigated. We demonstrate that the RSH is capable of predicting the space-time spectra of these fluctuations when the corresponding spatial spectra and appropriate convection and sweeping velocities are employed. However, when the RSH is applied to the spectral relationship between streamwise velocity fluctuations and SRNS fluctuations, discrepancies between the RSH-based predictions and the results from direct numerical simulation are observed. We propose that the inaccuracy arises from the frequency and amplitude modulations of the SRNS spectra, which are induced by streamwise velocity fluctuations but are not accounted for by the RSH. Theoretical expressions for the convection velocity and spectral bandwidth of the SRNS fluctuations are derived, highlighting the significant influence of the frequency and amplitude modulations on the space-time spectra of the SRNS fluctuations. Furthermore, a rescaling approach is proposed to improve the RSH-based space-time spectral relationship for large-scale structures, particularly in matching the spectral bandwidth and spectral peak. |
| 分类号 | 一类/力学重要期刊 |
| WOS关键词 | TURBULENT-BOUNDARY-LAYER ; WALL-PRESSURE ; SIMULATION ; VELOCITY |
| 资助项目 | National Natural Science Foundation of China10.13039/501100001809[12472220] ; National Natural Science Foundation of China10.13039/501100001809[52302451] ; National Natural Science Foundation of China[2023M740479] ; China Postdoctoral Science Foundation[KDJJ20230502015] ; China Space Foundation Aerospace Propulsion Special Fund[DUT24RC(3)116] ; Fundamental Research Funds for the Central Universities |
| WOS研究方向 | Mechanics ; Physics |
| 语种 | 英语 |
| WOS记录号 | WOS:001476938300008 |
| 资助机构 | National Natural Science Foundation of China10.13039/501100001809 ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; China Space Foundation Aerospace Propulsion Special Fund ; Fundamental Research Funds for the Central Universities |
| 其他责任者 | 吴霆 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/101142]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 作者单位 | 1.Dalian Univ Technol, Sch Energy & Power Engn, Dalian 116024, Peoples R China; 2.Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian 116024, Peoples R China; 3.Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China; 4.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang HY,Ning, Dezhi,Wu T,et al. Evaluation of the random sweeping hypothesis for the Reynolds normal stress fluctuation spectra[J]. PHYSICS OF FLUIDS,2025,37(4):21. |
| APA | 张慧颖,Ning, Dezhi,吴霆,&何国威.(2025).Evaluation of the random sweeping hypothesis for the Reynolds normal stress fluctuation spectra.PHYSICS OF FLUIDS,37(4),21. |
| MLA | 张慧颖,et al."Evaluation of the random sweeping hypothesis for the Reynolds normal stress fluctuation spectra".PHYSICS OF FLUIDS 37.4(2025):21. |
入库方式： OAI收割
来源：力学研究所
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