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9 papers · 1 filter
The problem of small and large scale fields in the solar dynamo
A. Brandenburg, N. E. L. Haugen, P. J. Käpylä +1
Three closely related stumbling blocks of solar mean field dynamo theory are discussed: how dominant are the small scale fields, how is the alpha effect quenched, and whether magne…
Hydrodynamic and hydromagnetic energy spectra from large eddy simulations
N. E. L. Haugen, A. Brandenburg
Direct and large eddy simulations of hydrodynamic and hydromagnetic turbulence have been performed in an attempt to isolate artifacts from real and possibly asymptotic features in…
Mach number dependence of the onset of dynamo action
Nils Erland L. Haugen, Axel Brandenburg, Antony J. Mee
The effect of compressibility on the onset of nonhelical turbulent dynamo action is investigated using both direct simulations as well as simulations with shock-capturing viscositi…
Inertial range scaling in numerical turbulence with hyperviscosity
Nils Erland L. Haugen, Axel Brandenburg
Numerical turbulence with hyperviscosity is studied and compared with direct simulations using ordinary viscosity and data from wind tunnel experiments. It is shown that the inerti…
Suppression of small scale dynamo action by an imposed magnetic field
Nils Erland L. Haugen, Axel Brandenburg
Non-helical hydromagnetic turbulence with an externally imposed magnetic field is investigated using direct numerical simulations. It is shown that the imposed magnetic field lower…
Self-similar scaling in decaying numerical turbulence
Tarek A. Yousef, Nils Erland L. Haugen, Axel Brandenburg
Decaying turbulence is studied numerically using as initial condition a random flow whose shell-integrated energy spectrum increases with wavenumber k like k^q. Alternatively, init…