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Journal of Statistical Physics

, Volume 161, Issue 6, pp 1508–1518 | Cite as

Vorticity Generation by Rough Walls in 2D Decaying Turbulence

  • Gábor Tóth
  • Imre M. Jánosi
Article

Abstract

In this work we present Lattice Boltzmann simulations of a decaying vortex array in a 2D rectangular domain, which is bounded by a random rough wall from one side. In order to separate the effects of the collisions with the rough wall, the opposite (smooth) rigid wall is placed at a larger distance from the center of the vortex array. Periodic boundary condition is imposed in the perpendicular direction. Well defined random roughness is generated by the widely studied Wolf–Villain surface growth algorithm. The main finding is that collisions with a rough wall generate excess vorticity compared with a smooth boundary, while the kinetic energy decreases monotonously. A proper measure is the integrated excess enstrophy, which exhibits an apparent maximum at an “optimal” roughness range. Numerical values of the excess enstrophy are very sensitive to a particular configuration (wall shape and vortex lattice randomization), however the “optimal” roughness exhibits surface features of similar characteristic sizes than that of the decaying vortices.

Keywords

Lattice Boltzmann method Two-dimensional turbulence  Rough solid wall Enstrophy Wolf–Villain model 

Notes

Acknowledgments

The authors thank Tímea Haszpra for technical help. This work was partially supported by the Hungarian Science Foundation under Grant Number OTKA NK100296.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.Department of Physics of Complex SystemEötvös Loránd UniversityBudapestHungary

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