The effect of nutation angle on the flow inside a precessing cylinder and its dynamo action

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985530%3A_____%2F23%3A00567522" target="_blank" >RIV/67985530:_____/23:00567522 - isvavai.cz</a>

Výsledek na webu

<a href="https://aip.scitation.org/doi/10.1063/5.0134562" target="_blank" >https://aip.scitation.org/doi/10.1063/5.0134562</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/5.0134562" target="_blank" >10.1063/5.0134562</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The effect of nutation angle on the flow inside a precessing cylinder and its dynamo action

Popis výsledku v původním jazyce

The effect of the nutation angle on the flow inside a precessing cylinder is experimentally explored and compared with numerical simulations. The focus is laid on the typical breakdown of the directly forced m =1 Kelvin mode for increasing precession ratio (Poincare number) and the accompanying transition between laminar and turbulent flows. Compared to the reference case with a 90 degrees nutation angle, prograde rotation leads to an earlier breakdown, while in the retrograde case, the forced mode continues to exist also for higher Poincare numbers. Depending largely on the occurrence and intensity of an axisymmetric double-roll mode, a kinematic dynamo study reveals a sensi-tive dependence of the self-excitation condition on the nutation angle and the Poincare? number. Optimal dynamo conditions are found for 90 degrees angle which, however, might shift to slightly retrograde precession for higher Reynolds numbers.

Název v anglickém jazyce

The effect of nutation angle on the flow inside a precessing cylinder and its dynamo action

Popis výsledku anglicky

The effect of the nutation angle on the flow inside a precessing cylinder is experimentally explored and compared with numerical simulations. The focus is laid on the typical breakdown of the directly forced m =1 Kelvin mode for increasing precession ratio (Poincare number) and the accompanying transition between laminar and turbulent flows. Compared to the reference case with a 90 degrees nutation angle, prograde rotation leads to an earlier breakdown, while in the retrograde case, the forced mode continues to exist also for higher Poincare numbers. Depending largely on the occurrence and intensity of an axisymmetric double-roll mode, a kinematic dynamo study reveals a sensi-tive dependence of the self-excitation condition on the nutation angle and the Poincare? number. Optimal dynamo conditions are found for 90 degrees angle which, however, might shift to slightly retrograde precession for higher Reynolds numbers.

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

2023

Kód důvěrnosti údajů

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

Název periodika

Physics of Fluids

ISSN

1070-6631

e-ISSN

1089-7666

Svazek periodika

35

Číslo periodika v rámci svazku

January

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

13

Strana od-do

014114

Kód UT WoS článku

000932332300007

EID výsledku v databázi Scopus

2-s2.0-85146839932