We investigate the thermal counterflow of the superfluid 4He by numerically simulating three-dimensional fully coupled dynamics of the two fluids, namely quantized vortices and a normal fluid. We analyze the velocity fluctuations of the laminar normal fluid arising from the mutual friction with the quantum turbulence of the superfluid component. The streamwise fluctuations exhibit higher intensity and longer-range autocorrelation, as compared to transverse fluctuations. Those anomalous fluctuations are consistent with the experiments. The fluctuations will trigger the transition of the normal fluid to turbulence unlike single-component flows.
|Publication status||Published - 2019 Nov 5|
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