Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 77: Focus Session: Quantum Turbulence and Imaging of Quantum Flow of Superfluids

TT 77.2: Hauptvortrag

Donnerstag, 15. März 2018, 10:00–10:30, H 0104

Numerical Simulation of Quantum Turbulence — •Makoto Tsubota — Department of Physics, Osaka City University, Osaka, Japan

Quantum turbulence (QT) is highly nonlinear and nonequilibrium phenomena. Thus numerical simulation is indispensable for studying QT. In this talk, we discuss some important topics of QT in atomic Bose-Einstein condensates (BECs) and superfluid helium. QT in atomic BECs includes several kinds of turbulence like vortex turbulence, wave turbulence, spin turbulence and two-component turbulence. We show these kinds of turbulence, and then focus on the recent confirmation of the cascade flux of QT in BECs trapped by a box potential. Next we discuss the coupled dynamics of the two-fluid model in superfluid helium. Superfluid is described by the vortex filament model and normal-fluid obeys the Navier-Stokes equation, and they are coupled through the mutual friction. Superfluid turbulence makes the normal fluid change its flow profile significantly, which is compared with the recent visualization experiments in thermal counterflow.

The author thanks K. Fujimoto, C. Eigen, J. Zhang, R. Lopes, N. Navon, R. Smith, Z. Hadzibabic, S. Yui and H. Kobayashi for collaboration.