Submitted by Richard Smith on March 17, 2017 - 08:20
In the bicycle world aerodynamics has taken on an ever increasingly important role. Cyclists are willing to go to great lengths and expense to realize performance enhancements through optimized aerodynamics in bicycle frames, wheels, and components. I thought it would be interesting to see where in the spectrum of aerodynamics performance disc rotors and fenders (mud guards) lie using Computational Fluid Dynamics (CFD) as our guide.
CFD Simulation of a Wheel with a Fender and Disc RotorVelocity contours at 25 degree yaw angle
Submitted by Richard Smith on March 2, 2017 - 15:31
If you want to go fast downhill then you better know your aerodynamics. For an alpine skier and a downhill cyclist, drag is the force holding them back, but with the application of some basic fluid dynamics knowledge they can go faster - a lot faster.
Eric Barone - 223,30 km/h (138.752 mph) - World mountain bike speed record
Submitted by Richard Smith on February 13, 2017 - 16:36
What if you could reduce the drag of a tractor-trailer truck by 23% and therefore reduce fuel consumption by 11%? Further, what if the only modification to the trailer was to apply some decals and hook up an electric power source? According to Plasma Stream Technologies these savings are viable if the plasma flow control they are developing fulfills its promise.
Improve the Pressure Recovery Behind a Trailer using PlasmaGeometry courtesy of Nectar Design
Submitted by Richard Smith on February 2, 2017 - 10:06
MotoGP is the pinnacle of motorcycle racing, just like Formula 1 is to car racing, so it should come as no surprise that aerodynamics is a key element for success. The focus in MotoGP was on drag reduction through streamlined fairings, helmets, and outfits. Then in 2015 Ducati added winglets to their front fairings to produce downforce.
Submitted by Richard Smith on December 1, 2016 - 10:05
Some fluid dynamics is intuitive, e.g., the water flow along a pipe, where what goes in one end comes out the other. However, most applications no matter how simple are anything but intuitive, e.g., the drag of a ball moving through air.
CFD Simulation of Flow Around a SphereHighly sensitive to Reynolds Number
Submitted by Richard Smith on November 23, 2016 - 17:47
Most Computational Fluid Dynamics (CFD) software provides an array of turbulence models. Knowing which model to select is not always an easy decision given trade offs between accuracy and computing requirements.
Turbulent Air Flow Behind a TruckGeometry courtesy of Nectar Design