Measurement of small-scale oceanic motions with neutrally-buoyant flloats

Turbulence attenuation by large neutrally buoyant particles

Dynamics of a small neutrally buoyant sphere in a fluid and targeting in Hamiltonian systems.

We show that, even in the most favorable case, the motion of a small spherical tracer suspended in a fluid of the same density may differ from the corresponding motion of an ideal passive particle. We demonstrate furthermore how its dynamics may be applied to target trajectories in Hamiltonian systems.

Description of stability and neutrally buoyant transport in freshwater lakes

The concept of potential density, introduced by oceanographers to describe the vertical stability of a water column, may be inadequate if the water temperature is close to the temperature of maximum density, Tmd, where the thermal expansion coefficient changes its sign. Because r,, decreases with increasing pressure potential density especially fails to provide a reliable means for the analysis...

Particle separation by Stokes number for small neutrally buoyant spheres in a fluid

It is a commonly observed phenomena that spherical particles with inertia in an incompressible fluid do not behave as ideal tracers. Due to the inertia of the particle, the dynamics are described in a four dimensional phase space and thus can differ considerably from the ideal tracer dynamics. Using Finite time Lyapunov exponents we compute the sensitivity of the final position of a particle wi...

Acceleration statistics of neutrally buoyant spherical particles in intense turbulence.

We measure acceleration statistics of neutrally buoyant spherical particles with a diameter 0.4 < d/eta < 27 in intense turbulence (400 < R(lambda) < 815). High speed cameras image polystyrene tracer particles in a flow between counterrotating disks. The measurements of acceleration variance clearly resolve the transition from the tracer like behavior of small particles to the much small...