UKFN Videos 31/7/18: Recent Episodes
Cambridge University
This video shows motion patterns of two phenomena, i.e. fluttering and autorotation, which are induced by vortices on a structure with non-circular section. Oscillatory rotation of a body through the fluid flow is known as Fluttering while the continuous rotation of which is named Autorotation. According to laboratory experiments, bifurcation of these phenomena depends on the moment of inertia of the body and also the velocity of fluid flow. Bifurcation diagram (stability diagram) which has been depicted by experimental data and also different motion patterns are shown in this video. In this video, I* is defined as the ratio of structural moment of inertia of the body to hydrodynamic moment of inertia of that body (known as added moment of inertia).
This video aims at presenting artistically the beauty of turbulent buoyant flows evolution in time and space. We will be using visualisation methods to present plumes, gravity currents and vortex rings, sometimes making them interact with one another. The colors, speed and frame order have been altered in places.
A numerical simulation of droplet splashing on a super-hydrophobic substrate. The numerical method is based on CLSVOF, VSIAM3, CIP-CSL scheme, density-scaled balanced CSF model.
This video shows the evolution of turbulent coherent structures in flow past a rounded ramp with active wall actuation. The spanwise alternately suppressed and enhanced local turbulence leads to the creation of a vertical shear layer, which is the key to generate large-scale streamwise vortices and thus realize flow separation.
The rotating annulus is a useful analogue of Earth's mid-latitude atmosphere. Here, two immiscible layers are used to represent stratification. Internal interfacial waves develop and interact nonlinearly. An optically active liquid ensures that different interface heights produce different colours. This raw video footage has not been enhanced in any way.