Anomalous Transport Due to Magnetic Turbulence

Cardozo, Niek Lopes

doi:10.13182/fst00-a11963224

Cited by 1 publication

(2 citation statements)

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“…17(c) gives a typical simulated poloidal NTM topology that indeed exhibits the expected characteristics; the red curve is a shearless transport barrier and is (considered) key to the survival of the remaining flux surfaces [105]. Second, transport by chaotic magnetic field lines is commonly regarded a stochastic turbulent-diffusionlike mechanism ("magnetic turbulence") devoid of spatial organisation [100,106]. However, chaotic advection in mixing flows implies a (though highly complex) well-defined spatial structure imparted by manifolds (Fig.…”

Section: Relevance Beyond Industrymentioning

confidence: 95%

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Lagrangian Transport and Chaotic Advection in Three-Dimensional Laminar Flows

Speetjens

Metcalfe

Rudman

2021

Applied Mechanics Reviews

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Transport and mixing of scalar quantities in fluid flows is ubiquitous in industry and Nature. Turbulent flows promote efficient transport and mixing by their inherent randomness. Laminar flows lack such a natural mixing mechanism and efficient transport is far more challenging. However, laminar flow is essential to many problems and insight into its transport characteristics of great importance. Laminar transport, arguably, is best described by the Lagrangian fluid motion ("advection") and the geometry, topology and coherence of fluid trajectories. Efficient laminar transport being equivalent to "chaotic advection" is a key finding of this approach. The Lagrangian framework enables systematic analysis and design of laminar flows. However, the gap between scientific insights into Lagrangian transport and technological applications is formidable primarily for two reasons. First, many studies concern two-dimensional (2D) flows yet the real world is three dimensional (3D). Second, Lagrangian transport is typically investigated for idealised flows yet practical relevance requires studies on realistic 3D flows. The present review aims to stimulate further development and utilisation of know-how on 3D Lagrangian transport and its dissemination to practice. To this end 3D practical flows are categorised into canonical problems. First, to expose the diversity of Lagrangian transport and create awareness of its broad relevance. Second, to enable knowledge transfer both within and between scientific disciplines. Third, to reconcile practical flows with fundamentals on Lagrangian transport and chaotic advection. This may be a first incentive to structurally integrate the "Lagrangian mindset" into the analysis and design of 3D practical flows.

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Section: Relevance Beyond Industrymentioning

confidence: 95%

“…5) and thus fundamentally contradicts this key assumption. Dedicated studies on chaotic magnetic field lines are indicative of such a spatial structure in NTM topologies [107,106].…”

Section: Relevance Beyond Industrymentioning

confidence: 99%