Anders Andersen (aanders@fysik.dtu.dk)
Tomas Bohr (tbohr@fysik.dtu.dk)
Flows of water or other fluids can exhibit amazing instabilities, where the symmetry of the flow changes, vortices are created or corners/needles suddenly appear. In this project, we perform an experiment on a hydrodynamic flow with a free surface and look at the flow structure and possible instabilities both experimentally and theoretically. We can e.g., look at polygons forming in hydraulic jumps, or in rotating flows, at the formation of bathtub vortices or at drops bouncing/walking on fluid surfaces. Come and discuss with us, if you like water flows and want to understand them.
Images of free surface flows in a hydraulic jump, a rotating cylinder, a flapping foil in a soap film, a bathtub vortex and for a bouncing-walking drop.