Journal of Fluid Mechanics最新文献

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On the low-frequency dynamics of turbulent separation bubbles 论湍流分离气泡的低频动力学
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-22 DOI: 10.1017/jfm.2024.532
C. Cura, A. Hanifi, A.V.G. Cavalieri, J. Weiss
{"title":"On the low-frequency dynamics of turbulent separation bubbles","authors":"C. Cura, A. Hanifi, A.V.G. Cavalieri, J. Weiss","doi":"10.1017/jfm.2024.532","DOIUrl":"https://doi.org/10.1017/jfm.2024.532","url":null,"abstract":"The low-frequency modal and non-modal linear dynamics of an incompressible, pressure-gradient-induced turbulent separation bubble (TSB) are investigated, with the objective of studying the mechanism responsible for the low-frequency contraction and expansion (breathing) commonly observed in experimental studies. The configuration of interest is a TSB generated on a flat test surface by a succession of adverse and favourable pressure gradients. The base flow selected for the analysis is the average TSB from the direct numerical simulation of Coleman <jats:italic>et al.</jats:italic> (<jats:italic>J. Fluid Mech.</jats:italic>, vol. 847, 2018, pp. 28–70). Global mode analysis reveals that the eigenmodes of the linear operator are damped for all frequencies and wavenumbers. Furthermore, the least damped eigenmode appears to occur at zero frequency and low, non-zero spanwise wavenumber when scaled with the separation length. Resolvent analysis is then employed to examine the forced dynamics of the flow. At low frequency, a region of low, non-zero spanwise wavenumber is also discernible, where the receptivity appears to be driven by the identified weakly damped global mode. The corresponding optimal energy gain is shown to have the shape of a first-order, low-pass filter with a cut-off frequency consistent with the low-frequency unsteadiness in TSBs. The results from resolvent analysis are compared to the unsteady experimental database of Le Floc'h <jats:italic>et al.</jats:italic> (<jats:italic>J. Fluid Mech.</jats:italic>, vol. 902, 2020, A13) in a similar TSB flow. The alignment between the optimal response and the first spectral proper orthogonal decomposition mode computed from the experiments is shown to be close to <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0022112024005329_inline1.png\"/> <jats:tex-math>$95,%$</jats:tex-math> </jats:alternatives> </jats:inline-formula>, while the spanwise wavenumber of the optimal response is consistent with that of the low-frequency breathing motion captured experimentally. This indicates that the fluctuations observed experimentally at low frequency closely match the response computed from resolvent analysis. Based on these results, we propose that the forced dynamics of the flow, driven by the weakly damped global mode, serve as a plausible mechanism for the origin of the low-frequency breathing motion commonly observed in experimental studies of TSBs.","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"242 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermal vortex ring: vortex-dynamics analysis of a high-resolution simulation 热涡流环:高分辨率模拟的涡流动力学分析
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-22 DOI: 10.1017/jfm.2024.485
Jun-Ichi Yano, Hugh Morrison
{"title":"Thermal vortex ring: vortex-dynamics analysis of a high-resolution simulation","authors":"Jun-Ichi Yano, Hugh Morrison","doi":"10.1017/jfm.2024.485","DOIUrl":"https://doi.org/10.1017/jfm.2024.485","url":null,"abstract":"A high-resolution simulation of a thermal vortex ring is analysed from the point of view of the vortex dynamics. A power-spectrum analysis of vortex-ring sections suggests that the simulated flows are overall ‘two dimensional’ in the large-scale limit, being dominated by axisymmetric components, but with a substantial contribution from the non-axisymmetric component at small scales. Contribution of the non-axisymmetric components is negligible in budgets of volume integrals of the vorticity and potential vorticity as well as the impulse (moments of the vorticity weighted by <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0022112024004853_inline1.png\"/> <jats:tex-math>$s^n$</jats:tex-math> </jats:alternatives> </jats:inline-formula> with <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0022112024004853_inline2.png\"/> <jats:tex-math>$n=-1$</jats:tex-math> </jats:alternatives> </jats:inline-formula>, 0, 1, where <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0022112024004853_inline3.png\"/> <jats:tex-math>$s$</jats:tex-math> </jats:alternatives> </jats:inline-formula> is the distance from the vertical axis of the vortex ring). A concise description of the dynamics is obtained as a function of geometrical factors together with these three integral variables. Analysis shows that the geometrical factors are fairly close to constant with time, and thus, a redundant closed description of the system is obtained in the similarity regime after spin up of the vortex ring. This redundancy leads to a constraint on the geometrical factors, which is reasonably satisfied by the simulation. A closed description is also obtained over the initial spin-up period of the vortex ring by adding a phenomenologically derived prognostic equation for the source for the volume integral of the potential vorticity (with <jats:inline-formula> <jats:alternatives> <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" mime-subtype=\"png\" xlink:href=\"S0022112024004853_inline4.png\"/> <jats:tex-math>$n=-1$</jats:tex-math> </jats:alternatives> </jats:inline-formula>). Analysis of the budget supports this description.","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"3 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Fully developed flow through shrouded-fin arrays: exact and asymptotic solutions 流经遮蔽鳍阵列的完全展开流:精确和渐近解
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.505
Hiroyuki Miyoshi, Toby L. Kirk, Marc Hodes, Darren G. Crowdy
{"title":"Fully developed flow through shrouded-fin arrays: exact and asymptotic solutions","authors":"Hiroyuki Miyoshi, Toby L. Kirk, Marc Hodes, Darren G. Crowdy","doi":"10.1017/jfm.2024.505","DOIUrl":"https://doi.org/10.1017/jfm.2024.505","url":null,"abstract":"<p><img href=\"S0022112024005056_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024005056/resource/name/S0022112024005056_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"32 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of pitch on nonlinear dynamics of helical vortex disturbed by long-wave instability 螺距对受长波不稳定性干扰的螺旋涡旋非线性动力学的影响
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.529
Yuji Hattori, Akihiro Hirano
{"title":"Effect of pitch on nonlinear dynamics of helical vortex disturbed by long-wave instability","authors":"Yuji Hattori, Akihiro Hirano","doi":"10.1017/jfm.2024.529","DOIUrl":"https://doi.org/10.1017/jfm.2024.529","url":null,"abstract":"<p><img href=\"S0022112024005299_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024005299/resource/name/S0022112024005299_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"50 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207636","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Transport scaling in porous media convection 多孔介质对流中的传输缩放
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.528
Xiaojue Zhu, Yifeng Fu, Marco De Paoli
{"title":"Transport scaling in porous media convection","authors":"Xiaojue Zhu, Yifeng Fu, Marco De Paoli","doi":"10.1017/jfm.2024.528","DOIUrl":"https://doi.org/10.1017/jfm.2024.528","url":null,"abstract":"<p><img href=\"S0022112024005287_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024005287/resource/name/S0022112024005287_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"7 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical study of a generic ship's airwake for understanding bi‐stability mechanism 为了解双稳态机制而对一般船舶气浪进行的数值研究
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.511
Kewei Xu, Xinchao Su, Isak Jonsson, Rickard Bensow, Sinisa Krajnovic
{"title":"Numerical study of a generic ship's airwake for understanding bi‐stability mechanism","authors":"Kewei Xu, Xinchao Su, Isak Jonsson, Rickard Bensow, Sinisa Krajnovic","doi":"10.1017/jfm.2024.511","DOIUrl":"https://doi.org/10.1017/jfm.2024.511","url":null,"abstract":"<p><img href=\"S0022112024005111_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024005111/resource/name/S0022112024005111_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"5 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermoelectrohydrodynamic convection in a finite cylindrical annulus under microgravity 微重力条件下有限圆柱环内的热电流体动力对流
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.538
Changwoo Kang, Innocent Mutabazi, Harunori N. Yoshikawa
{"title":"Thermoelectrohydrodynamic convection in a finite cylindrical annulus under microgravity","authors":"Changwoo Kang, Innocent Mutabazi, Harunori N. Yoshikawa","doi":"10.1017/jfm.2024.538","DOIUrl":"https://doi.org/10.1017/jfm.2024.538","url":null,"abstract":"<p><img href=\"S002211202400538X_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS002211202400538X/resource/name/S002211202400538X_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"28 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207637","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Three-dimensional generative adversarial networks for turbulent flow estimation from wall measurements 根据壁面测量结果估算湍流的三维生成对抗网络
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.432
Antonio Cuéllar, Alejandro Güemes, Andrea Ianiro, Óscar Flores, Ricardo Vinuesa, Stefano Discetti
{"title":"Three-dimensional generative adversarial networks for turbulent flow estimation from wall measurements","authors":"Antonio Cuéllar, Alejandro Güemes, Andrea Ianiro, Óscar Flores, Ricardo Vinuesa, Stefano Discetti","doi":"10.1017/jfm.2024.432","DOIUrl":"https://doi.org/10.1017/jfm.2024.432","url":null,"abstract":"<p><img href=\"S0022112024004324_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024004324/resource/name/S0022112024004324_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"10 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142226608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Numerical validation of scaling laws for stratified turbulence 分层湍流比例定律的数值验证
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.531
Pascale Garaud, Gregory P. Chini, Laura Cope, Kasturi Shah, Colm-cille P. Caulfield
{"title":"Numerical validation of scaling laws for stratified turbulence","authors":"Pascale Garaud, Gregory P. Chini, Laura Cope, Kasturi Shah, Colm-cille P. Caulfield","doi":"10.1017/jfm.2024.531","DOIUrl":"https://doi.org/10.1017/jfm.2024.531","url":null,"abstract":"<p><img href=\"S0022112024005317_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024005317/resource/name/S0022112024005317_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"17 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Jet mixing enhancement with Bayesian optimization, deep learning and persistent data topology 利用贝叶斯优化、深度学习和持久数据拓扑增强喷气混合效果
IF 3.7 2区 工程技术
Journal of Fluid Mechanics Pub Date : 2024-08-20 DOI: 10.1017/jfm.2024.525
Yiqing Li, Bernd R. Noack, Tianyu Wang, Guy Y. Cornejo Maceda, Ethan Pickering, Tamir Shaqarin, Artur Tyliszczak
{"title":"Jet mixing enhancement with Bayesian optimization, deep learning and persistent data topology","authors":"Yiqing Li, Bernd R. Noack, Tianyu Wang, Guy Y. Cornejo Maceda, Ethan Pickering, Tamir Shaqarin, Artur Tyliszczak","doi":"10.1017/jfm.2024.525","DOIUrl":"https://doi.org/10.1017/jfm.2024.525","url":null,"abstract":"<p><img href=\"S0022112024005251_figAb.png\" mimesubtype=\"png\" mimetype=\"image\" orientation=\"\" position=\"\" src=\"https://static.cambridge.org/content/id/urn%3Acambridge.org%3Aid%3Aarticle%3AS0022112024005251/resource/name/S0022112024005251_figAb.png?pub-status=live\" type=\"\"/></p>","PeriodicalId":15853,"journal":{"name":"Journal of Fluid Mechanics","volume":"2017 1","pages":""},"PeriodicalIF":3.7,"publicationDate":"2024-08-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142207633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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