Transition from laminar to turbulent dynamo: the effect of varying Prandtl number

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F21%3A00533012" target="_blank" >RIV/67985530:_____/21:00533012 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.tandfonline.com/doi/abs/10.1080/03091929.2020.1804900?journalCode=ggaf20" target="_blank" >https://www.tandfonline.com/doi/abs/10.1080/03091929.2020.1804900?journalCode=ggaf20</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1080/03091929.2020.1804900" target="_blank" >10.1080/03091929.2020.1804900</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Transition from laminar to turbulent dynamo: the effect of varying Prandtl number

Popis výsledku v původním jazyce

We carry out numerical dynamo simulations in a spherical shell to assess the influence of varying Prandtl number on the morphology of the induced magnetic field in both cases when the convection is laminar and turbulent. We work in a regime of large magnetic Prandtl number (Pm = 3) due to computational constraints of the full three-dimensional numerical model. We consider dynamos driven by thermal convection in the regimes of small and unit Prandtl numbers. Unlike the laminar convection, in the turbulent regime the morphology of the induced magnetic fields depends only weakly on the Prandtl number. For both values of Pr considered the magnetic field is non-dipolar and small-scale. Together with the previous results of other authors, who found that the morphology of the magnetic field does not change substantially with Pr when Pm is small, the results of our study suggest that the induced magnetic field does not vary substantially with Pr regardless of the strength of the magnetic diffusion.

Název v anglickém jazyce

Transition from laminar to turbulent dynamo: the effect of varying Prandtl number

Popis výsledku anglicky

We carry out numerical dynamo simulations in a spherical shell to assess the influence of varying Prandtl number on the morphology of the induced magnetic field in both cases when the convection is laminar and turbulent. We work in a regime of large magnetic Prandtl number (Pm = 3) due to computational constraints of the full three-dimensional numerical model. We consider dynamos driven by thermal convection in the regimes of small and unit Prandtl numbers. Unlike the laminar convection, in the turbulent regime the morphology of the induced magnetic fields depends only weakly on the Prandtl number. For both values of Pr considered the magnetic field is non-dipolar and small-scale. Together with the previous results of other authors, who found that the morphology of the magnetic field does not change substantially with Pr when Pm is small, the results of our study suggest that the induced magnetic field does not vary substantially with Pr regardless of the strength of the magnetic diffusion.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10508 - Physical geography

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geophysical and Astrophysical Fluid Dynamics

ISSN

0309-1929

e-ISSN

1029-0419

Svazek periodika

115

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

15

Strana od-do

192-206

Kód UT WoS článku

000560861400001

EID výsledku v databázi Scopus

2-s2.0-85089594855