Making bubbles with a laser

Posted by james venning
When you focus a laser beam in water (because that’s something normal people do…) you concentrate the energy of the laser light into a small volume of water. This can cause the water to ru... Read More

Super-cavitating Sphere

Posted by james venning
Here we have a lovely example of supercavitation. Regular cavitation occurs when the pressure of a fluid drops below vapour pressure in the presence of a weakness (termed nucleus) in the water. This f... Read More

von Karman shedding behind a normal flat plate.

Posted by james venning
Here we have some visualisation of the wake of a normal flat plate. The plate is quasi-two-dimensional (spans the water channel). It has very sharp edges to reduce Reynolds sensitivity to the thicknes... Read More

Shear layer vortices behind a normal flat plate.

Posted by james venning
In fluid dynamics some quick flow visualisation can often reveal a lot about the flow. Here we have dye injected into the upstream flow of the water channel. You can see two parallel streams on the ve... Read More

Flow separation at front end of Ahmed body.

Posted by james venning
Some dye visualisation of the Ahmed body at low Reynolds number (Re_L = 26000). This simple experiment shows the scale, location and shape of the separated region. Additionally, we can see some vortex... Read More