Physical Review Fluids

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Cessation of a dense granular flow down an inclined plane

Mon, 02/04/2019 - 10:00

Author(s): S. Bharathraj and V. Kumaran

A simulation study of a dense granular inclined plane flow reveals a sharp transition between a Bagnold flow and a layered flow at critical angle, which is a fraction of a degree above the cessation angle. The layered flow exhibits intriguing features, such as oscillations of the flow velocity.

[Phys. Rev. Fluids 4, 024301] Published Mon Feb 04, 2019

Modeling mode interactions in boundary layer flows via the parabolized Floquet equations

Fri, 02/01/2019 - 10:00

Author(s): Wei Ran, Armin Zare, M. J. Philipp Hack, and Mihailo R. Jovanović

Multimodal stability analysis and parabolization are combined to account for dominant mode interactions in pretransitional flow. A sequence of linear progressions of the resulting parabolized Floquet equations captures disturbance growth and provides excellent agreement with direct numerical simulation results.

[Phys. Rev. Fluids 4, 023901] Published Fri Feb 01, 2019

Three-wave resonant interactions and zonal flows in two-dimensional Rossby-Haurwitz wave turbulence on a rotating sphere

Fri, 02/01/2019 - 10:00

Author(s): Kiori Obuse and Michio Yamada

The importance of zonal modes in discussing three-wave resonant nonlinear interactions in two-dimensional turbulence on a rotating sphere is investigated. Zonal modes should not be ignored although the energy exchanges between zonal and nonzonal modes by resonant interactions are not possible.

[Phys. Rev. Fluids 4, 024601] Published Fri Feb 01, 2019