Zobrazeno 1 - 10
of 57
pro vyhledávání: '"Kreilos, Tobias"'
When subcritical shear flows transition to turbulence, laminar and turbulent flow often coexists in space, giving rise to turbulent-laminar patterns. Most prominent are regular stripe patterns with large-scale periodicity and oblique orientation. Obl
Externí odkaz:
http://arxiv.org/abs/1809.02877
Autor:
Khapko, Taras, Kreilos, Tobias, Schlatter, Philipp, Duguet, Yohann, Eckhardt, Bruno, Henningson, Dan S.
The concept of edge state is investigated in the asymptotic suction boundary layer in relation with the receptivity process to noisy perturbations and the nucleation of turbulent spots. Edge tracking is first performed numerically, without imposing a
Externí odkaz:
http://arxiv.org/abs/1605.03002
Publikováno v:
Journal of Fluid Mechanics / Volume 795 / May 2016, R3
We present two spanwise-localized travelling wave solutions in the asymptotic suction boundary layer, obtained by continuation of solutions of plane Couette flow. One of the solutions has the vortical structures located close to the wall, similar to
Externí odkaz:
http://arxiv.org/abs/1605.00494
Autor:
Kreilos, Tobias, Khapko, Taras, Schlatter, Philipp, Duguet, Yohann, Henningson, Dan S., Eckhardt, Bruno
The spatio-temporal aspects of the transition to turbulence are considered in the case of a boundary layer flow developing above a flat plate exposed to free-stream turbulence. Combining results on the receptivity to free-stream turbulence with the n
Externí odkaz:
http://arxiv.org/abs/1604.07235
Autor:
Kreilos, Tobias, Khapko, Taras, Schneider, Tobias M, Veble, Gregor, Duguet, Yohann, Schlatter, Philipp, Henningson, Dan S, Eckhardt, Bruno
We study the transition to turbulence in the asymptotic suction boundary layer (ASBL) by direct numerical simulation. Tracking the motion of trajectories intermediate between laminar and turbulent states we can identify the invariant object inside th
Externí odkaz:
http://arxiv.org/abs/1508.07710
Autor:
Tuckerman, Laurette S., Kreilos, Tobias, Schrobsdorff, Hecke, Schneider, Tobias M., Gibson, John F.
Publikováno v:
Physics of Fluids 26, 114103 (2014)
Turbulent-laminar banded patterns in plane Poiseuille flow are studied via direct numerical simulations in a tilted and translating computational domain using a parallel version of the pseudospectral code Channelflow. 3D visualizations via the stream
Externí odkaz:
http://arxiv.org/abs/1404.1502
Publikováno v:
Phys. Rev. Lett. 112, 044503, 2014
In linearly stable shear flows turbulence spontaneously decays with a characteristic lifetime that varies with Reynolds number. The lifetime sharply increases with Reynolds number so that a possible divergence marking the transition to sustained turb
Externí odkaz:
http://arxiv.org/abs/1310.8610
Publikováno v:
Phys. Rev. E 89, 043008 (2014)
We study the stability of coherent structures in plane Couette flow against long-wavelength perturbations in wide domains that cover several pairs of coherent structures. For one and two pairs of vortices, the states retain the stability properties o
Externí odkaz:
http://arxiv.org/abs/1309.6912
Publikováno v:
Journal of Fluid Mechanics / Volume 751 / July 2014, pp 685-697
Parallel shear flows come with continuous symmetries of translation in the downstream and spanwise direction. As a consequence, flow states that differ in their spanwise or downstream location but are otherwise identical are dynamically equivalent. I
Externí odkaz:
http://arxiv.org/abs/1309.4590
Autor:
Khapko, Taras, Duguet, Yohann, Kreilos, Tobias, Schlatter, Philipp, Eckhardt, Bruno, Henningson, Dan S.
We study numerically transitional coherent structures in a boundary-layer flow with homogeneous suction at the wall (the so-called asymptotic suction boundary layer ASBL). The dynamics restricted to the laminar-turbulent separatrix is investigated in
Externí odkaz:
http://arxiv.org/abs/1308.5531