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Session: Intermittency and scaling 3

Session starts: Wednesday 26 August, 10:30

Presentation starts: 11:30

Room: Room H

*Uriel Frisch ()*

Samriddhi Sankar Ray ()

Ganapati Sahoo ()

Debarghya Banerjee ()

Rahul Pandit ()

Abstract:

An energy-spectrum bottleneck, a bump in the turbulence spectrum between the inertial and dissipation ranges, is shown to occur in the non-turbulent, one-dimensional, hyperviscous Burgers equation and found to be the Fourier-space signature of oscillations in the real-space velocity, which are explained by boundary-layer-expansion techniques. Pseudospectral simulations are used to show that such oscillations occur in velocity correlation functions in one- and three-dimensional hyperviscous hydrodynamical equations that display genuine turbulence.

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*Uriel Frisch, Samriddhi Sankar Ray, Ganapati Sahoo, Debarghya Banerjee, Rahul Pandit*

11:30

15 mins

Real-space Manifestations of Bottlenecks in Turbulence Spectra,
15 mins

Session starts: Wednesday 26 August, 10:30

Presentation starts: 11:30

Room: Room H

Samriddhi Sankar Ray ()

Ganapati Sahoo ()

Debarghya Banerjee ()

Rahul Pandit ()

Abstract:

An energy-spectrum bottleneck, a bump in the turbulence spectrum between the inertial and dissipation ranges, is shown to occur in the non-turbulent, one-dimensional, hyperviscous Burgers equation and found to be the Fourier-space signature of oscillations in the real-space velocity, which are explained by boundary-layer-expansion techniques. Pseudospectral simulations are used to show that such oscillations occur in velocity correlation functions in one- and three-dimensional hyperviscous hydrodynamical equations that display genuine turbulence.