The present direct numerical simulations investigate the dynamics of diverse streamwise vortices in a zero-pressure gradient incompressible laminar boundary layer and the onset of turbulence. Due to the critical role of streamwise vortices in bypass transitions, we compare the transition mechanisms induced by a single vortex and vortex pairs. We initially examine the evolution of a single vortex by employing streamwise vortex profiles at two wall-normal locations. The single streamwise vortex will prompt a more rapid eruption from the bottom part of the boundary layer if moved nearer to the wall, as observed in the experimental study by Manu et al. [“Evolution of isolated streamwise vortices in the late stages of boundary-layer transition,” Exp. Fluids 48, 431–440 (2010)]. In the late stages of boundary-layer transition, the vortex–wall interaction emerges to be particularly pronounced. The second set of simulations triggers flow transition by imposing counter-rotating vortex pairs at the inlet of the computational domain. Streamwise vortex pairs with net upward flows cause intense, sporadic ejections of near-wall fluids into the boundary-layer edge, providing the first signs of inflectional instability in all considered cases. Instead of vortex–wall interactions, flow structures created by vortex pairs penetrate deeply into the inviscid region, resulting in substantial unsteady viscous-inviscid interactions. When counter-rotating vortices accompany to form a net downward flow, the initial formation of each vortex is analogous to that of a single vortex. The instability frequency and wavelength of the transitional flow produced by a vortex introduced in the middle of the boundary layer are lower than those imposed near the wall. The transitional flow generated by the vortex pair exhibits longer-wavelength instability than the single vortex cases.
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July 2022
Research Article|
July 12 2022
Characteristics of boundary-layer transition driven by diverse streamwise vortices
Navaneet Villodi
;
Navaneet Villodi
(Software, Validation, Visualization, Writing – original draft)
Department of Aerospace Engineering, Indian Institute of Space Science and Technology
, Thiruvananthapuram 695547, Kerala, India
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Manu K. V.
Manu K. V.
a)
(Conceptualization, Investigation, Supervision, Writing – original draft, Writing – review & editing)
Department of Aerospace Engineering, Indian Institute of Space Science and Technology
, Thiruvananthapuram 695547, Kerala, India
a)Author to whom correspondence should be addressed: [email protected]
Search for other works by this author on:
a)Author to whom correspondence should be addressed: [email protected]
Physics of Fluids 34, 074113 (2022)
Article history
Received:
May 10 2022
Accepted:
June 26 2022
Citation
Navaneet Villodi, Manu K. V.; Characteristics of boundary-layer transition driven by diverse streamwise vortices. Physics of Fluids 1 July 2022; 34 (7): 074113. https://doi.org/10.1063/5.0098544
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