Few areas of geophysics are today progressing as rapidly as basic geomagnetism, which
seeks to understand the origin of the Earth's magnetism. Data about the present …

We present an attempt to reach realistic turbulent regime in direct numerical simulations of
the geodynamo. We rely on a sequence of three convection-driven simulations in a rapidly …

These lecture notes are based on a tutorial given in 2017 at a plasma physics winter school
in Les Houches. Their aim is to provide a self-contained graduate-student level introduction …

Helicity is, like energy, a quadratic invariant of the Euler equations of ideal fluid flow,
although, unlike energy, it is not sign definite. In physical terms, it represents the degree of …

Recent decades have seen enormous progress in the experimental investigation of
fundamental processes that are relevant to geophysical and astrophysical fluid dynamics …

The aspect ratio (Γ) dependence of the heat transfer (Nusselt number Nu in dimensionless
form) in turbulent (two-dimensional) Rayleigh-Bénard convection is numerically studied in …

We demonstrate that a magneto-convection simulation incorporating essential physical
processes governing solar surface convection exhibits turbulent small-scale dynamo action …

The Wisconsin Plasma Astrophysics Laboratory (WiPAL) is a flexible user facility designed
to study a range of astrophysically relevant plasma processes as well as novel geometries …

We present a general construction of divergence-free knotted vector fields from complex
scalar fields, whose closed field lines encode many kinds of knots and links, including torus …

Flow between concentric spheres of radius ratio η= ri/ro= 0.35 is studied in a 3 m diameter
experiment. We have measured the torques required to maintain constant boundary speeds …