Mixing and Dispersion in Flows Dominated by Rotation and Buoyancy

July 6, 2015 — July 10, 2015

Coordinators:

  • Gert Jan van Heijst (Eindhoven University of Technology, The Netherlands)
  • Herman Clercx (Eindhoven University of Technology, The Netherlands)

Rotation and buoyancy play an essential role in many astrophysical, geophysical, environmental and industrial flows. They influence the transition to turbulence, strongly affect largescale (turbulent) flow properties by inducing anisotropy, and also affect boundary-layer dynamics and inertial-range turbulence characteristics. Moreover, rotation and buoyancy may have a strong impact on the dispersion of passive and active tracers and of (inertial) particles and droplets in such flows. The impact of buoyancy or rotation on transport may be direct (gravitational, centrifugal or Coriolis forces on fluid parcels or particles/droplets) or indirect by the modified flow characteristics. These impact significantly heat and mass transfer in many natural systems. Examples are (largescale) convection processes, transport of sediment in coastal flows, dispersion of suspended particulate matter in estuarine flows, in lakes and reservoirs, and dispersion of aerosols and pollutants in the atmospheric boundary layer. Increasing computational capabilities and the rapid development of advanced experimental measurement tools, for example optical diagnostics and particle tracking, provide highly resolved temporal and spatial data sets. This allows the exploration and analysis of more complex flow phenomena and the associated transport processes in more depth.
The aim of the course is to present a state-of-the-art overview of current developments in this exciting field in a way accessible to attendees coming from a variety of fields. Relevant example are, turbulence research, (environmental) fluid mechanics, lake hydrodynamics and atmospheric physics. Topics to be discussed during the lectures range from the fundamentals of rotating and stratified flows, mixing and transport in stratified or rotating turbulence, transport in the atmospheric boundary layer, the dynamics of gravity and turbidity currents eventually with effects of background rotation or stratification, mixing in (stratified) lakes, and the Lagrangian approach in the analysis of transport processes in geophysical and environmental flows. We have composed a team of lecturers who are able to address these topics from fundamental, experimental and numerical points of view. Moreover, part of the lectures cover fundamental aspects including a number of the basic dynamical properties of rotatin and or stratified (turbulent) flows, the mathematical description of these flows, some applications in the natural environment, and the Lagrangian statistical analysis of turbulent transport processes and turbulent transport of material particles (including, for example, inertial and finite-size effects). Four lectures are dedicated to specific topics such as transport in (stratified) lakes, transport and mixing in the atmospheric boundary layer, mixing in stratified fluids and dynamics of turbidity currents.
The course is addressed to doctoral students and postdoctoral researchers, but also to academic and industrial researchers and practicing engineers, with a background in mechanical engineering, applied physics, civil engineering, applied mathematics, meteorology, physical oceanography or physical limnology.

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