English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present magneto-hydrodynamic simulations of liquid sodium flow with thePLUTO compressible MHD code. We investigate the influence of the remnantmagnetic field orientation and intensity, impinging velocity field due to Ekmanpumping as well as the impeller dimensions on the magnetic field collimation byhelical flows in between the impeller blades. For a simplified cartesiangeometry we model the flow dynamics of a multi-blades impeller inspired by theVon-Karman-Sodium (VKS) experiment. The study shows that a remnant magneticfield oriented in the toroidal direction is the less efficient configuration tocollimate the magnetic field, although if the radial or vertical components arenot negligible the collimation is significantly improved. If the intensity ofthe remnant magnetic field increases the system magnetic energy is larger butthe magnetic field collimation efficiency is the same, so the gain of magneticenergy is smaller as the remnant magnetic field intensity increases. Themagnetic field collimation is modified if the impinging velocity field changes:the collimation is weaker if the impinging velocity increases from Gamma=0.8 to0.9, slightly larger if the impinging velocity decreases from Gamma=0.8 to 0.7.The analysis of the impeller dimensions points out that the most efficientconfiguration to collimate the magnetic field requires a ratio between impellerblade height and base longitude between 0.375 - 0.5. The largest enhancement ofthe hypothetical alpha^2 dynamo loop, compared to the hypothetical Omega-alphadynamo loop, is observed for the model that mimics TM 73 impeller configurationrotating in the unscooping direction with a remnant magnetic field of 10^-3 Torientated in the radial or vertical direction. The optimization trendsobtained in the parametric analysis are also confirmed in simulations withhigher resolution and turbulence degree.

Parametric study and optimization trends for the Von-K\'{a}rm\'{a}n-Sodium dynamo experiment