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- เผยแพร่เมื่อ 16 ต.ค. 2024
- Sample project: app.airshaper....
More information: www.airshaper.com or info@airshaper.com
In this video is a step by step explanation of how to use CFD simulations to analyze the aerodynamics of a motorbike. We used the 3D model created by Dotto Creations, a fantastic design agency in Italy, who teamed up with AirShaper for the Motorbike Aerodynamics Challenge in 2023.
--Setup--
The AirShaper platform was used to set up the simulation. The motorbike was oriented forward and a rotation was added to all of the wheels.
--Results--
Pressure clouds (iso-surface for the total pressure coefficient of 0):
These illustrate where energy losses are high. This highlights the drag caused by the front suspension, mirrors, wind screen, rider, exposed wheels, the drivetrain, etc.
Pressure map: this one illustrates the pressure perpendicular to the surface. It clearly shows the pressure buildup at the front and on the exposed front wheels. It also shows the pressure reduction in locations where the air speeds up to move around a curvature.
Friction map: this one shows the magnitude of the friction force of the air flowing parallel to the surface. When low, this can indicate either stagnation of the flow (at the nose for example) or separation of the flow (on the back of the rider, just behind the wind screen, ...). The surface streamlines indicate how the air moves across the surface.
3D streamlines: these show how the air flows around the wind screen, in between the front wheel & the cover, ...
Noise: this is an estimation of the sources of wind noise. As this is a steady stage RANS simulation, it is just an approximation based on the turbulent kinetic energy.
Elements: the flow through the radiator is visualized and the total flow rate is calculated.
Forces: the forces on each individual element are calculated.
I would love to see the aero of a bike in yaw, with the rider having a significant lean angle(knee touching the ground). I suspect the leg of the rider affects the aero of the bike, which is also in ground effect. Is that why the wings on bikes have a high anhedral angle? Once the rider is leaning the bike, the angle becomes vertical on 'lean towards side', and horizontal on the 'lean away side'. That way the front wing on the outside produces downforce, while the inner one works more like a vertical stabilizer.
Very cool!
This is brilliant! More motorcycle aero content please! I am trying to make my bike as slick as possible for top speed racing without replacing the factory fairings. Any advice you may have?
Ah, there are plenty of other motorbike videos on our channel with tips on that. Making sure the feet are tucked away, tuning the wind screen to the driver helmet position, shielding the suspension, ...
And we have a video coming up in a few weeks on how to lower motorcycle drag, so stay tuned :)
@@AirShaper i have viewed every single one of your motorcycle videos :) i am looking forward to the new video on aero drag. I appreciate all of your efforts and for making these available for free!
@@TheBadMadMan786 In the next video we'll cover how "Design Advice" (or adjoint sensitivity maps) can suggest how to reduce drag. The sample project is already available: app.airshaper.com/simulations/dotto-creations-airshaper-motogp-challenge-aero-update-3-less-drag
Red means move it outward along the normal, blue means inward. We'll explain more in the video!