erolivas
Well-Known Member
- Joined
- Oct 19, 2020
- Threads
- 6
- Messages
- 99
- Reaction score
- 180
- Location
- New Mexico
- First Name
- Eric
- Vehicle(s)
- '20 Shelby GT500, '18 Raptor, '15 STi,'11 Frontier
To start with one would need to know the amount of down force that is generated with the OEM base wing/swing to get started. Generally speaking you start seeing measurable down force around 50mph; however anything over 70mph is when the vehicle handling increases due to the benefits of the wing. There is a fine line of adding too much surface area that gives you more down force, but then you pay the piper with added drag (more on that). Drag can be broken down to frictional drag and pressure drag. If there is no flow separation in the flow field then frictional drag (stresses acting on the surface of the vehicle) is the main drag component. If there is a ton of flow separation in the rear of the vehicle this leads to a pretty drastic pressure gradient, i.e. pressure drag. Ideally to design a wing one would need a scaled model to use in a wind tunnel along with particle injection to measure and map the velocity profile and pressure contour via PIV (particle induced velocimetry). These results along with CFD and 2-way FSI (fluid structure interaction) to do verification and validation. If experimentation is out of reach CFD is a must.
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