fp-023c - Front Aero Device Study
- Aim of the simulation
- Summary of simulation “fp-023b - Front Aero Devices”
- Front Fender Louvers
- Front Fender Stay (Part 1)
- Front Fender Stay (Part 2)
- S-Duct B
- Front Fender Louver C + Louver Stay B
- Ride Height Comparison
This car project is my formula style 2-seater car project published in GitHub.
I designed the car in the style of the early 2000s formula cars. The reason it’s a “2-seater” is to allow you to share the joy of riding in a formula car with your friends on the road, it is not only for competition on racing circuits.
The prefix “fp” are the initials of “formula-ppoino”. “-ppoino” is a Japanese expression that means “thing(s) looks/sounds/drives like -”, so “formula-ppoino” means it “looks like a formula car”.
I designed the car using the modelling software Rhinoceros.
To import multiple faces, the body, front wheels and rear wheels into one geometry, I exported ASCII STL files of each faces from Rhinoceros and edited the names of the solids in these ASCII STL files manually. Then I put these STL files together into the one STL file using “cat” command and uploaded it.
The size of the mesh required is at least 9M nodes in this case. It was derived from the result of the simulations in "fp-023b Test-C https://www.simscale.com/projects/yosukegb4/fp-023b_test-c/ ".
The conditions of the simulations are in accordance with the state of the car running on public roads.
- Inlet velocity, Moving floor speed : 30 m/s (= 108 km/h)
- Ride height : Front: 110mm / Rear: 110mm (basically)
Aim of the simulations
Generally, during aerodynamic development of racing cars, you mainly focus on the characteristics below.
- Downforce, Drag, L/D
- Balance of the front and rear downforces
- Sensitivity of the Downforce and Balance to the vehicle ride heights
Through simulation, as in "fp-023b Test-C https://www.simscale.com/projects/yosukegb4/fp-023b_test-c/ ",
I found there was insufficient front downforce. It depends on the car weight balance and how the vehicle ride heights change, but I provisionaly set a goal to distribute the front and rear downforces of the body to be about 60-65%. ( Clf : Clr = 40-35 : 60-65 )
Summary of simulation “fp-023b - Front Aero Devices”
I tested some front aero-devices in the simulation "fp-023b - Front Aero Devices https://www.simscale.com/projects/yosukegb4/fp-023b_control/ ". The following front aero-devices increased the front downforce effectively. These decreased the aerodynamical front lift to almost zero, but the ratio of front-rear downforce was still 96% on the rear axle.
- S-Duct at Nose Cone
- Front Wing t50 (changed from t40)
- Modified Front Inner Fender
- Front Flap
- Position X+20mm
- Angle +7.5deg (mechanical MAX +15deg)
Coefficients of the Body and Wheels
- fp-023b Control : Base of “fp-023b - Front Aero Devices”
- fp-023c Control : Best result of “fp-023b - Front Aero Devices”