Real-space Manifestations of Bottlenecks in Turbulence Spectra,etc15 Tracking Number 448 Presentation: Session: Intermittency and scaling 3 Room: Room H Session start: 10:30 Wed 26 Aug 2015 Uriel Frisch uriel@oca.eu Affifliation: Samriddhi Sankar Ray ssray@icts.res.in Affifliation: Ganapati Sahoo ganapati.sahoo@gmail.com Affifliation: Debarghya Banerjee debarghyabnrj@gmail.com Affifliation: Rahul Pandit rahul@physics.iisc.ernet.in Affifliation: Topics: - Intermittency and scaling 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. |