Analysis of Quantised Vortex Tangle by Alexander John Taylor

By Alexander John Taylor

In this thesis, the writer develops numerical concepts for monitoring and characterising the convoluted nodal traces in three-d area, analysing their geometry at the small scale, in addition to their international fractality and topological complexity---including knotting---on the massive scale. The paintings is very visible, and illustrated with many appealing diagrams revealing this unanticipated point of the physics of waves. Linear superpositions of waves create interference styles, this means that in a few locations they boost each other, whereas in others they thoroughly cancel one another out. This latter phenomenon happens on 'vortex strains' in 3 dimensions. in most cases wave superpositions modelling e.g. chaotic hollow space modes, those vortex traces shape dense tangles that experience by no means been visualised at the huge scale prior to, and can't be analysed mathematically through any recognized strategies.

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B. Kajtar, Leonardo da Vinci’s turbulent tank in two dimensions. Eur. J. Mech. B-Fluid. 44, 1–9 (2014) 3. B. McLeish, Tube theory of entangled polymer dynamics. Adv. Phys. 51(6), 1379–527 (2002) 4. M. Farge, K. Schneider, G. A. S. Rogallo, Coherent vortex extraction in three-dimensional homogeneous turbulence: comparison between CVS-wavelet and PODFourier decompositions. Phys. Fluids 15(10), 2886–2896 (2003) 5. K. Nemirovskii, Quantum turbulence: theoretical and numerical problems. Phys. Rep. 524, 85–202 (2013) 6.

M. I.

E. ξ, ξx , ξx y etc. where the subscripts indicate differentials) since these quantities are not independent; in practice the calculation can be simplified by linearising their matrix of correlations to obtain the same number of now-independent Gaussian-distributed quantities. Most of the vortex line properties in [34] are obtained by performing this integral analytically, with the condition of being on a vortex line guaranteed by requiring that the real and imaginary field components are zero.

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