Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Giesecke, Andre"'
We numerically examine dynamo action generated by a flow of an electrically conducting fluid in a precessing cylindrical cavity. We compare a simplified kinematic approach based on the solution of the magnetic induction equation with a prescribed vel
Externí odkaz:
http://arxiv.org/abs/2410.14449
Autor:
Giesecke, André, Vogt, Tobias, Pizzi, Federico, Kumar, Vivaswat, Gonzalez, Fernando Garcia, Gundrum, Thomas, Stefani, Frank
We examine the fluid flow forced by precession of a rotating cylindrical container using numerical simulations and experimental flow measurements with ultrasonic Doppler velocimetry (UDV). The analysis is based on the decomposition of the flow field
Externí odkaz:
http://arxiv.org/abs/2409.17789
The magnetised spherical Couette (MSC) problem, a three dimensional magnetohydrodynamic paradigmatic model in geo- and astrophysics, is considered to investigate bifurcations to high-dimensional invariant tori and chaotic flows in large scale dissipa
Externí odkaz:
http://arxiv.org/abs/2306.13763
The existence of triadic resonances in the magnetized spherical Couette system (MSC) is related to the development of modulated rotating waves, which are quasiperiodic flows understood in terms of bifurcation theory in systems with symmetry. In contr
Externí odkaz:
http://arxiv.org/abs/2103.05924
Publikováno v:
Phys. Rev. Lett. 125, 264501 (2020)
The occurrence of magnetohydrodynamic (MHD) quasiperiodic flows with four fundamental frequencies in differentially rotating spherical geometry is understood in terms of a sequence of bifurcations breaking the azimuthal symmetry of the flow as the ap
Externí odkaz:
http://arxiv.org/abs/2007.03422
The long therm behavior of chaotic flows is investigated by means of time dependent frequency analysis. The system under test consists of an electrically conducting fluid, confined between two differentially rotating spheres. The spherical setup is e
Externí odkaz:
http://arxiv.org/abs/2006.15145
Direct numerical simulations of a liquid metal filling the gap between two concentric spheres are presented. The flow is governed by the interplay between the rotation of the inner sphere (measured by the Reynolds number Re) and a weak externally app
Externí odkaz:
http://arxiv.org/abs/2004.01260
Publikováno v:
Solar Physics 294 (2019), 60
We discuss a solar dynamo model of Tayler-Spruit type whose Omega-effect is conventionally produced by a solar-like differential rotation but whose alpha-effect is assumed to be periodically modulated by planetary tidal forcing. This resonance-like e
Externí odkaz:
http://arxiv.org/abs/1803.08692
The project DRESDYN (DREsden Sodium facility for DYNamo and thermohydraulic studies) conducted at Helmholtz-Zentrum Dresden-Rossendorf (HZDR) provides a new platform for a variety of liquid sodium experiments devoted to problems of geo- and astrophys
Externí odkaz:
http://arxiv.org/abs/1803.06099
Publikováno v:
Phys. Rev. Fluids 4, 033901 (2019)
We report an experimental study of the instability of a nearly-resonant Kelvin mode forced by precession in a cylindrical vessel. The instability is detected above a critical precession ratio via the appearance of peaks in the temporal power spectrum
Externí odkaz:
http://arxiv.org/abs/1803.04699