Journal: Journal of Turbulence

Abbreviation

J. turbul.

Publisher

Taylor & Francis

Journal Volumes

ISSN

1468-5248

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Publications 1 - 10 of 16
  • Stabilisation of subcritical bypass transition in the leading-edge boundary layer by suction
    Item type: Journal Article
    John, Michael O.; Obrist, Dominik; Kleiser, Leonhard (2014)
    Journal of Turbulence
    This work investigates the subcritical spatial transition in the swept Hiemenz boundary layer by means of direct numerical simulations (DNS). A pair of steady co-rotating vortices located at the attachment line is enforced as a primary disturbance leading to streaks which are stable. A small secondary, time-dependent disturbance interacts with these streaks such that instability and breakdown to turbulence may occur. The instability only occurs for a certain band of secondary disturbance frequencies. Positive secondary instability growth rates could be observed for Reynolds numbers as low as, whereas the linear critical Reynolds number isRecrit,lin ≈ 583. Uniform wall suction is shown to stabilise this transition mechanism, analogously to results from linear stability theory. The effects of suction on the formation of primary streaks and on the secondary growth rate are decoupled. For streaks of different suction whose amplitude is held constant by adjusting the Reynolds number, the suction is shown to increase the growth rate of the secondary instability. The stabilising influence of wall suction consists in decreasing the streak amplitude only.Depending on the Reynolds number and the suction strength, breakdown may either occur locally and may be convected along the far-field streamlines, or occur globally and cover broad regions in the downstream direction.
  • Large-eddy simulation of spatial transition in plane channel flow
    Item type: Journal Article
    Schlatter, Philipp; Stolz, Steffen; Kleiser, Leonhard (2006)
    Journal of Turbulence
  • Experimental study on clustering of large particles in homogeneous turbulent flow
    Item type: Journal Article
    Guala, Michele; Liberzon, Alex; Hoyer, Klaus; et al. (2008)
    Journal of Turbulence
  • An immersed interface method for the vortex-in-cell algorithm
    Item type: Journal Article
    Walther, Jens Honoré; Morgenthal G. (2002)
    Journal of Turbulence
  • The turbulent/nonturbulent interface in penetrative convection
    Item type: Journal Article
    van Reeuwijk, Maarten; Holzner, Markus (2017)
    Journal of Turbulence
  • Role of vortical structures for enstrophy and scalar transport in flows with and without stable stratification
    Item type: Journal Article
    Neamtu-Halic, Marius M.; Mollicone, Jean-Paul; van Reeuwijk, Maarten; et al. (2021)
    Journal of Turbulence
    We investigate the enstrophy dynamics in relation to objective Eulerian coherent structures (OECSs) and their impact on the enstrophy and scalar transport near the turbulent/non-turbulent interface (TNTI) in flows with and without stable stratification. We confirm that vortex-stretching produces enstrophy inside the boundaries of the OECSs, while viscous diffusion transfers the enstrophy across the boundaries of the structures. Although often overlooked in the literature, viscous dissipation of enstrophy within the boundaries of vortical structures is significant. Conversely, for the weakly stratified flows also investigated here, the effect of the baroclinic torque is negligible. We provide evidence that the OECSs advect the passive/active scalar and redistribute it via molecular diffusion. Finally, we use conditional analysis to show that the typical profiles of the enstrophy and scalar transport equation terms across the TNTI are compatible with the presence of OECSs positioned at the edge between the turbulent sublayer and the turbulent core region. We show that when these profiles are further conditioned to the presence of OECSs, their magnitude is considerably higher.
  • Lagrangian multi-particle statistics
    Item type: Journal Article
    Lüthi, Beat; Ott, Soren; Berg, Jacob; et al. (2007)
    Journal of Turbulence
  • Direct modelling of subgrid scales of turbulence in large eddy simulations
    Item type: Journal Article
    Domaradzki, J.A.; Adams, Nikolaus A. (2002)
    Journal of Turbulence
  • Evolutionary optimization of an anisotropic compliant surface for turbulent friction drag reduction
    Item type: Journal Article
    Fukagata, Koji; Kern, Stefan; Chatelain, Philippe; et al. (2008)
    Journal of Turbulence
  • Turbulent shear layers in confining channels
    Item type: Journal Article
    Benham, Graham P.; Castrejon-Pita, Alfonso A.; Hewitt, Ian J.; et al. (2018)
    Journal of Turbulence
Publications 1 - 10 of 16