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- Andrew W Baggaley, Carlo F Barenghi, Yuri A Sergeev
- Physical review. E, Statistical, nonlinear, and…
- 2014

In low-temperature superfluid helium, viscosity is zero and vorticity takes the form of discrete vortex filaments of fixed circulation and atomic thickness. We present numerical evidence of three-dimensional inverse energy transfer from small length scales to large length scales in superfluid turbulence generated by a flow of vortex rings. We argue that the… (More)

- E L Toth, A Baggaley
- Psychiatry
- 1991

Patients with factitious disorders represent an important challenge to medical and psychiatric caregivers. The literature on Munchausen's syndrome abounds with entertaining descriptions of these flamboyant patients, but rarely is there significant understanding of the mechanisms of the disease. We present a case where Munchausen's syndrome coincided with… (More)

- A W Baggaley, C F Barenghi
- Physical review. E, Statistical, nonlinear, and…
- 2011

Two research groups have measured turbulent velocity statistics in superfluid helium using different techniques. The results were in conflict: one experiment revealed Gaussian distributions (as observed in ordinary turbulence), the other experiment determined power laws. To solve the apparent puzzle, we numerically model quantum turbulence as a tangle of… (More)

- Erik M. Salomons, Walter J. A. Lohman, Han Zhou, Andrew Baggaley
- PloS one
- 2016

Propagation of sound waves in air can be considered as a special case of fluid dynamics. Consequently, the lattice Boltzmann method (LBM) for fluid flow can be used for simulating sound propagation. In this article application of the LBM to sound propagation is illustrated for various cases: free-field propagation, propagation over porous and non-porous… (More)

- Andrew W Baggaley, Carlo F Barenghi
- Physical review. E, Statistical, nonlinear, and…
- 2014

New methods of flow visualization near absolute zero have opened the way to directly compare quantum turbulence (in superfluid helium) to classical turbulence (in ordinary fluids such as air or water) and explore analogies and differences. We present results of numerical simulations in which we examine the statistics of the superfluid acceleration in… (More)

Using a multi-scaled, chaotic flow known as the KS model of turbulence [7], we investigate the dependence of Lyapunov exponents on various characteristics of the flow. We show that the KS model yields a power law relation between the Reynolds number and the maximum Lyapunov exponent, which is similar to that for a turbulent flow with the same energy… (More)

- C. F. Barenghi, Y. A. Sergeev, A. W. Baggaley
- Scientific reports
- 2016

Experiments and numerical simulations of turbulent (4)He and (3)He-B have established that, at hydrodynamic length scales larger than the average distance between quantum vortices, the energy spectrum obeys the same 5/3 Kolmogorov law which is observed in the homogeneous isotropic turbulence of ordinary fluids. The importance of the 5/3 law is that it… (More)

- A W Baggaley
- Physical review. E, Statistical, nonlinear, and…
- 2015

We modify the standard Vicsek model to clearly distinguish between intrinsic noise due to imperfect alignment between organisms and extrinsic noise due to fluid motion. We then consider the effect of a steady vortical flow, the Taylor-Green vortex, on the dynamics of the flock, for various flow speeds, with a fixed intrinsic particle speed. We pay… (More)

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