Streak generation in viscosity-stratified wall-bounded flows
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
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| _version_ | 1866911127669047296 |
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| author | Madhusudanan, Anagha Illingworth, Simon J. Govindarajan, Rama |
| author_facet | Madhusudanan, Anagha Illingworth, Simon J. Govindarajan, Rama |
| contents | Streamwise elongated flow structures, or streaks, dominate wall-bounded flows. We show that the renowned lift-up mechanism, that generates streaks, is significantly altered by viscosity stratification. We additionally identify a novel pathway for streak generation: the viscosity-stratified lift-up mechanism. The competition and cooperation of the streaks generated by these mechanisms provides an explanation for trends in viscosity-stratified Poiseuille flows, and remarkably, the opposing trends in Couette flows as well. Our theoretical observations are substantiated by numerical experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_20636 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Streak generation in viscosity-stratified wall-bounded flows Madhusudanan, Anagha Illingworth, Simon J. Govindarajan, Rama Fluid Dynamics Streamwise elongated flow structures, or streaks, dominate wall-bounded flows. We show that the renowned lift-up mechanism, that generates streaks, is significantly altered by viscosity stratification. We additionally identify a novel pathway for streak generation: the viscosity-stratified lift-up mechanism. The competition and cooperation of the streaks generated by these mechanisms provides an explanation for trends in viscosity-stratified Poiseuille flows, and remarkably, the opposing trends in Couette flows as well. Our theoretical observations are substantiated by numerical experiments. |
| title | Streak generation in viscosity-stratified wall-bounded flows |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2508.20636 |