Super Cavitation Watercraft

Say you've been tasked with designing a new water pleasure craft optimized for speed called the Slickjet (fictional name). You ask the fundamental question - how do you travel fast through water? Easy, get as much of your Slickjet out of the water as you can. You know that the drag force acting on a totally submerged shape in water will be about 1000 times higher than for the same shape in air - the drag force scales according to the density of the fluid and water is 1000 times denser than air. Of course this assumes you are willing to get FAA approval for an aircraft rather than a boat. However, there is an alternative in that if you can somehow cocoon parts of your Slickjet in an air bubble as it moves through the water then you can convince the physics that those parts of your Slickjet are moving through air rather than water. This process is known as super cavitation and results in the drag forces acting on those parts of your Slickjet being more like those encountered in air rather than water.

GHOST Super Cavitation WatercraftGHOST Super Cavitation WatercraftCourtesy of Juliet Marine Systems

Caedium v4 Sneak Peek: Japanese Translation

You will be able to perform Computational Fluid Dynamics (CFD) simulations in a selection of languages, including Japanese, with the next release of the Caedium CFD software system.

Vertical Axis Wind Turbine Lenz2 Caedium CFD SimulationJapanese Caedium Interface

Caedium v4 Sneak Peek: Rotating Vertical Axis Wind Turbine CFD Simulation

You will be able to simulate rotating wind turbines and mixers with the next release of the Caedium CFD software system. Caedium will support Moving Reference Frames (MRF), which is an efficient way to simulate rotating machinery.

Vertical Axis Wind Turbine Lenz2 Caedium CFD SimulationVertical Axis Wind Turbine Lenz2 Caedium CFD SimulationLeft: Stationary, Right: MRF

Caedium CFD Software Helps High School Team To 2nd Fastest Time at the German F1 in Schools Finals

You may recall back in March that I covered how the high school team Fastcination won the South-East German F1 in Schools competition with help from Caedium. That regional win qualified Fastcination to compete for the 2012 German F1 in Schools title and now the results from that competition are in. Fastcination recorded the second fastest track time thanks to their low-drag CO2 dragster, aided by the Computational Fluid Dynamics (CFD) simulations performed by Caedium Professional.

Team FastcinationTeam FastcinationLeft to right: Steven Klotz, Julian Lemke, Nicola Schrepf, Maria Voss, Merle Schulken, Gregor Matl

London 2012 Olympics: Fluid Technology for Cycling

Cycling is one of the fastest sports in the Olympics. With that speed comes an increased importance on aerodynamics. In cycling the aerodynamic design is focused on minimizing drag. However, as with swimming, there are carefully crafted rules that ensure there is only a narrow scope for aerodynamic optimization to gain a competitive advantage.

Fishing NetLondon 2012 Cycling Test EventCredit: London 2012

Vortex Shedding Behind a Cylinder

Given how simple the geometry defining a cylinder is, you'd intuitively think that the air flow around it would also be simple. And as with many things fluid you'd be wrong.

Vortex Shedding Caedium CFD SimulationVelocity vectors (high definition video)

London 2012 Olympics: Fluid Technology for Track and Field (Athletics)

A big draw of any Olympics is the track and field (athletics) events and no less so in London. What effect is the application of fluid technology to these events likely to have? If past Olympics are anything to go by - not much!

Nike Pro Turbospeed Promo Video: Starts at 0:50

London 2012 Olympics: Fluid Technology for Swimming

With the London 2012 Olympics just around the corner, I thought it would be interesting to review the application of fluid technology to various Olympic sports, starting with swimming.

Men's 200m Freestyle Final - World's Swimming Championship Shanghai 2011No more supersuits

Wind Turbine Crossed with a Blimp

Another helium-filled post - this time it's a helium-filled blimp that houses a horizontal-axis wind turbine [source: gizmag]. Altaeros Energies recently released a video of their prototype Airborne Wind Turbine in action:

Tetrahedra Take Flight

Who knew that tetrahedra could fly? I know, pretty much anything can fly when you fill it with helium, but the movement of helium-filled tetrahedra called SmartInversion by Festo gives rise to an interesting and unusual propulsion method [source: gizmag]. Using inverse kinetics, Festo have developed what they call an "airborne geometrical band with inversion drive". The movement is difficult to describe but mesmerizing to watch:

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