Background
I was involved with the early development of Genesis Hypercar GR1. We used to call it GR1, but I guess the code name has changed to GMR01(Genesis Magma Racing?). Working with the Genesis design studio in Irvine I was able to guide the designers to consider FIA regulation, the aerodynamic balance and the efficiency of the vehicle. Much of the focus on the earlier days was on the asthetic not performance and I am quite happy see that the design of the vehicle has changed for the better. *Disclaimer, I am not a professional LMP1/LMH aero engineer and what has been written here can be inaccurate (hopefully not too much).
Aerodynamic Efficiency and Balance
Aerodynamic efficiency refers to the ratio between lift ($C_{L}$) and drag ($C_{D}$), $C_{L}/C_{D}$ and it is a one of key metric to evaluate the performance of the vehicle. The value will change depending on the setup and the value will reflect on the nature of the circuit.
The typical value of $C_{L}/C_{D}$ ranges from 2 - 4 for LMP1 vehicles.
At Le Mans, there is a lot of long stretches with striaght lines which means that $C_{L}/C_{D}$ will be closer to 4
At Bahrain, the course is a mixture of long straights and low speed corner so $C_{L}/C_{D}$ will be closer to 2 or 3
Aerodynamic balance is the ratio between front lift ($C_{LF}$) and rear Lift ($C_{LR}$). There is a bit of a rear bias to aid in cornering for these kind of vehicles, but this value will also depend on the circuit. The target was not defined during the development, and I had to create my own target based on my previous experience as a FSAE aerodynamics team member.
Based on the numbers above, I determined the targets accordingly. At the end of the day, the real development work will be done by the Magma team and my job was to ensure the vehicle was as realistic as possible.
Aero Items
The items below were utilized to meet my self-imposed aero target, since the changes I could make to the exterior of the vehicle was very limited. The items are nothing new and they have been around for a very long time. I just had to introduce these items to the designers and let them know that these have to be integrated into their theme if they really want to design a very high performance vehicle.
Dive Planes & Splitter
Splitter and dive planes (canards) are required to increase downforce at the front of the vehicle. Flow tends to accelerate when it travels along the hood area, but pressure decreases since energy is conserved. This increases the lift and especially $C_{LF}$