Hydrodynamic flows exhibit turbulent behaviour which is not well understood till date. When
a fluid is in a gravitational field, the flow becomes even more complex due to the gravity …

Recent numerical simulations showed that mean flow is generated in the inhomogeneous
turbulence of an incompressible fluid that is accompanied by helicity and system rotation. In …

Kinetic helicity and its spatial distribution are thought to be important for the maintenance of
a dipolar magnetic field in the geodynamo through the α-effect. Outside the inner core …

The distribution of kinetic helicity in a dipolar planetary dynamo is central to the success of
that dynamo. Motivated by the helicity distributions observed in numerical simulations of the …

Tomographic particle image velocimetry measurements of turbulent swirling jets open new
explorations of mean and pulse components and pattern dynamics. We present direct …

The liquid iron core of the Earth undergoes vigorous convection driven by thermal and
compositional buoyancy. The dynamics of convective fluid motions and heat transfer in such …

Inertial waves are oscillations in a rotating fluid, such as the Earth's outer core, which result
from the restoring action of the Coriolis force. In an earlier work, it was argued by Davidson …

Helicity, the inner product of velocity and vorticity, is considered an important ingredient for
the maintenance of a dipolar magnetic field in the geodynamo. Outside the tangent cylinder …

We consider dissipation of surface waves on fluids, with a view to its effects on analogue
gravity experiments. We begin by reviewing some general properties of wave dissipation …

Inertial waves are oscillations in a rotating fluid that arise due to the restoring action of the
Coriolis force. Low-frequency inertial waves are known to create columnar flow structures …