Flow stabilization with active hydrodynamic cloaks.

Journal Article (Journal Article)

We demonstrate that fluid flow cloaking solutions, based on active hydrodynamic metamaterials, exist for two-dimensional flows past a cylinder in a wide range of Reynolds numbers (Re's), up to approximately 200. Within the framework of the classical Brinkman equation for homogenized porous flow, we demonstrate using two different methods that such cloaked flows can be dynamically stable for Re's in the range of 5-119. The first highly efficient method is based on a linearization of the Brinkman-Navier-Stokes equation and finding the eigenfrequencies of the least stable eigenperturbations; the second method is a direct numerical integration in the time domain. We show that, by suppressing the von Kármán vortex street in the weakly turbulent wake, porous flow cloaks can raise the critical Reynolds number up to about 120 or five times greater than for a bare uncloaked cylinder.

Full Text

Duke Authors

Cited Authors

  • Urzhumov, YA; Smith, DR

Published Date

  • November 21, 2012

Published In

Volume / Issue

  • 86 / 5 Pt 2

Start / End Page

  • 056313 -

PubMed ID

  • 23214882

Pubmed Central ID

  • 23214882

Electronic International Standard Serial Number (EISSN)

  • 1550-2376

International Standard Serial Number (ISSN)

  • 1539-3755

Digital Object Identifier (DOI)

  • 10.1103/physreve.86.056313

Language

  • eng