### Abstract

This work investigates flow structures in Couette-Poiseuille (C-P) flows with the adverse pressure gradient (APG) adjusted to create zero mean skin friction on the stationary wall. The vortical structures are identified as regions with a positive value of the discriminant of the velocity gradient tensor (Chong et al., 1990; Soria et al., 1994). The data used in current study are from direct numerical simulation (DNS). The enstrophy density and the dissipation of kinetic energy carried by flow structures are instigated by examining the second invariants of the symmetric strain rate tensor S_{i j} and the skew-symmetric rate of rotation tensor W_{i j} (Chong et al. (1998)). Some characterizations of the topological flow structures in the near-wall region are similar to a viscous sub-layer in channel flows (Blackburn et al., 1996).

Original language | English |
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Publication status | Published - 1 Jan 2019 |

Event | Turbulence and Shear Flow Phenomena 2019 - Southampton, United Kingdom Duration: 30 Jul 2019 → 2 Aug 2019 Conference number: 11th http://tsfp11.org/ |

### Conference

Conference | Turbulence and Shear Flow Phenomena 2019 |
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Abbreviated title | TSFP 2019 |

Country | United Kingdom |

City | Southampton |

Period | 30/07/19 → 2/08/19 |

Internet address |

### Cite this

*The three-dimensional structures in turbulent Couette-Poiseuille flows on the verge of separation*. Paper presented at Turbulence and Shear Flow Phenomena 2019, Southampton, United Kingdom.