Lift-up and streak waviness drive the self-sustained process in wall-bounded transition to turbulence
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910360163844096 |
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| author | Liu, Tao Semin, Benoît Godoy-Diana, Ramiro Wesfreid, José Eduardo |
| author_facet | Liu, Tao Semin, Benoît Godoy-Diana, Ramiro Wesfreid, José Eduardo |
| contents | Flow field measurements from a Couette-Poiseuille experiment are used to examine quantitatively certain steps of the self-sustained process (SSP) of wall-bounded transition to turbulence. Although the different parts of the SSP have been discussed at large in the literature, direct measurements from experiment are scarce and, to our knowledge, the present results are the first to show, using a local analysis of the turbulent patterns, that: (1) the amplitude of streamwise rolls is related to streak waviness, bringing a quantitative picture to one of the main physical mechanisms of Waleffe's model of SSP ; and (2), at low waviness, direct measurements of the correlation between the streak and roll amplitudes, respectively probed by the streamwise and wall-normal velocity perturbations, quantify the lift-up effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_16792 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Lift-up and streak waviness drive the self-sustained process in wall-bounded transition to turbulence Liu, Tao Semin, Benoît Godoy-Diana, Ramiro Wesfreid, José Eduardo Fluid Dynamics Flow field measurements from a Couette-Poiseuille experiment are used to examine quantitatively certain steps of the self-sustained process (SSP) of wall-bounded transition to turbulence. Although the different parts of the SSP have been discussed at large in the literature, direct measurements from experiment are scarce and, to our knowledge, the present results are the first to show, using a local analysis of the turbulent patterns, that: (1) the amplitude of streamwise rolls is related to streak waviness, bringing a quantitative picture to one of the main physical mechanisms of Waleffe's model of SSP ; and (2), at low waviness, direct measurements of the correlation between the streak and roll amplitudes, respectively probed by the streamwise and wall-normal velocity perturbations, quantify the lift-up effect. |
| title | Lift-up and streak waviness drive the self-sustained process in wall-bounded transition to turbulence |
| topic | Fluid Dynamics |
| url | https://arxiv.org/abs/2308.16792 |