Environmental Fluid Mechanics

The influence of rotation on the flow through a rectangular cavity (MSc)

This is an experimental project (but some numerical work can also be performed) in collaboration with prof. Leo Maas (NIOZ, UU) and is motivated by our interest in understanding basic aspects of rotating turbulence. When background rotation affects turbulence through the Coriolis force but does not dominate the flow dynamics, there is a complex (and still poorly understood) interplay between inertial waves, the turbulent eddies, and the mean flow.

To gain further insight into this interplay a flow is driven through a box by a pressure difference between two holes on opposite sides of the tank. Without background rotation, the flow rate depends only on the pressure difference. However, when the setup is placed on top of a rotating table, the flow rate also depends on the rotation rate of the system. In addition, background rotation generates a pressure gradient in the span-wise direction (this is reminiscent of the Hall effect in electromagnetism).

Research questions: How does background rotation influence the flow and the flow rate? What is the role played by inertial waves? How do they interact with the mean flow?

Matias Duran Matute, GertJan van Heijst, Leo Maas (NIOZ, UU)

Contact: Matias Duran Matute

 

 

Dipolar vortices colliding against obstacles: cylinders, porous walls, wall with gap (BSc/MSc)

Laboratory experiments on dipolar vortices in a shallow-layer fluid (EM forcing) or in a rotating fluid. Dye visualization, PIV flow measurements. Numerical simulations with COMSOL. Cases to be considered: dipole colliding against plate with sharp edge, against a corrugated wall (with a zigzag profile), against a row of cylinders, against a wall with an opening.

Leon Kamp, GertJan van Heijst

Contact: Leon Kamp