Special feature: Ride the Wind – Renault & Formula One

Melbourne 2018. Do you keep in mind this race? Probably not as a result of the opening race of final 12 months’s Formulation One season was extraordinarily boring. Or no less than it was in case you like your races to incorporate a lot of overtaking manoeuvres and ideally daring and thrilling ones. In that race there have been solely 15 overtakes. Fifteen in two hours of racing. Solely Hungary 2018 ended up with fewer (14). One spectator was not solely bored by this lack of drama but in addition horrified. FIA president Jean Todt realised that speedy motion was required.

Overtaking had turn into troublesome as a result of the lead automotive’s aerodynamics brought on such an upset within the airflow behind it, that it made it nearly unattainable for the pursuing automobiles to move due to the quantity of downforce it value them.

Todt advised his technical group to right away draw up revised aero laws to unravel the issue.

“There’d been no trace of a change,” explains Renault’s head of aerodynamics Pete Machin, ◊ ∆ “which was a little bit of a nuisance for us as a result of we’d already began engaged on our automotive for the 2019 season. We needed to throw every little thing that we’d executed into the bin. Worse nonetheless, the brand new laws had been written in a rush to fulfill the April 30th deadline and had been stuffed with contradictions. These took many months to resolve, needing unanimous settlement from groups after the April deadline.”

Primarily, the brand new laws got down to scale back outwashing of entrance wheel wakes on the automobiles. Outwash generated by the entrance wing and entrance axle geometries pushes entrance wheel wakes additional outboard and away from the rear of the automotive for higher aero efficiency. The aero options that designers had give you to control outwash had been fairly unimaginable. For instance, the entrance axles had been hole in order that air might be channelled by the wheel spindle, by the centre of the wheel nut and out into the air to push entrance wheel wakes additional outboard. The entrance wings had been much more spectacular.

“Previous to the brand new 2019 laws,” explains Machin, “the foundations for entrance wing design had been fairly easy: you got the scale of an imaginary cuboid and all you needed to do was ensure that your wing fitted inside that field. It meant that you simply had been free so as to add just about any element that you simply wished. Now, underneath the brand new regs, the wings’ dimensions haven’t solely been modified however you’re restricted to a most of 5 wing components and becoming a most of two under-wing strakes per aspect. Angle constraints additionally restrict the speed of change of geometry in plan and entrance views. By no means earlier than have entrance wing guidelines and laws been so closely prescribed.”

In addition to the modifications to the entrance wings, there have been a mess of different tweaks to the foundations. These hole axles needed to go and so did winglets mounted on brake ducts that additionally performed an element in controlling entrance wheel wakes. Modifications weren’t restricted to the entrance of the automotive; the rear wing was made larger and wider in order that the wake or ‘rooster tail’ coming off the again of the automotive can be larger and serving to to elevate entrance wheel wake losses, that are additional inboard resulting from diminished potential to outwash. The next automotive then enjoys larger vitality movement and larger downforce when following.

So along with his work on the 2019 automotive’s aero mendacity in a dustbin on the finish of March 2018, the place did Pete Machin and his group begin on working to the unexpectedly revised laws? “Nicely, slightly than throw every little thing that we’d learnt on the previous [2018] automotive we set about attempting to adapt what we already had,” says Machin. “Expertise and data provides you a reasonably good thought of what you’re going to wish to do and which course to go.”

Machin and his group have two foremost instruments of their arsenal: CFD which stands for Computational Fluid Dynamics, a extremely refined laptop programme that makes use of numerical evaluation to foretell airflow throughout surfaces of the automotive. The second instrument is the wind tunnel. Put merely, the designers construct a pc mannequin of, say, the entrance wing after which run the software program to foretell the efficiency of the wing. Then a mannequin will be fabricated from the half and tried out within the wind tunnel. Sounds moderately simple. But it surely isn’t.

“Prior to now,” says Machin, “there have been no restrictions involving this work. In the present day, nevertheless, in pursuit of decreasing prices in F1, the period of time that we are able to spend not solely within the wind tunnel but in addition on CFD are considerably restricted. For instance, we’re solely allowed to run the wind tunnel a most of 65 instances in a single week (averaged over eight-week intervals) whereas once I first began in F1 we had been working the wind tunnel 24/7 and had been finishing up as many as 300 checks in per week. We’re additionally solely allowed to make one change of wind tunnel mannequin per 24-hour interval.”

Does the FIA have any individual sat exterior the wind tunnel with a pocket book and stopwatch?

“Not precisely,” says Machin. “However the pace of the fan within the tunnel is recorded and if the airflow goes above 5 metres per second, that counts as a run. Each eight weeks the FIA analyses our knowledge to examine that we haven’t exceeded the time we’re allowed to run the tunnel.”

Appendix eight is the weighty tome that’s F1’s sporting laws. It clearly units out all of the bodily guidelines that the tunnel itself has to adjust to and the fashions which might be utilized in it. For instance, the utmost measurement of mannequin is 60 % scale and the utmost airspeed that you should use is 50 metres per second or 112 mph. “You’re allowed to run the transferring highway underneath the automotive at any pace you want however the one purpose that we’d run the highway at a unique pace to the airflow is to simulate the impact of a head or tailwind,” says Machin.

The identical monitoring applies to the CFD work, besides it’s measured not in time spent in entrance of the display however within the variety of teraflops used. As a result of each laptop simulation and wind tunnel time are restricted, it’s an actual ability to guage the purpose at which it’s important to cease work on CFD and go to the wind tunnel. “That’s true,” feedback Machin, “however CFD is much more correct than it was once and often the outcomes that we see within the tunnel are usually not that totally different from what we anticipated from the pc simulation. The identical goes for the automotive’s efficiency on the monitor – most likely about three or 4 instances a season we get a giant shock. Normally it’s to do with wheel wake.”

“It’s very troublesome to realize the on-track tyre shapes with mannequin tyres within the wind tunnel and troublesome in CFD,” explains Machin, “particularly with as we speak’s small 13-inch rims and bigger tyres as a result of there’s a variety of flex within the tyre and motion because it modifications form at excessive pace. Because the tyre modifications form, so does the wheel wake.”

All through the season Pete Machin and his group can be consistently engaged on the automotive’s
aero to try to eke out extra efficiency. “We’ll expect to see an enchancment of about two seconds a lap from the start of the season to the automotive’s efficiency on the finish of it. Engine enhancements and aero are the principle sources of improved efficiency however each space of the automotive contributes, together with geometry modifications that enhance mechanical grip.”

So far as workload and complication are involved, nothing matches dramatic modifications within the guidelines round aerodynamics. Not even a change of engine provider or elementary specification throws the ball so excessive into the air as a rule change like that launched for this season. “In 2021 we may have new laws, dramatically totally different, to hold on from the 2019 modifications to make racing nearer. And to cut back prices,” says Machin. Hopefully, these modifications can be launched in a extra orderly trend than 2019’s. No matter, Machin and his group can be utilizing technical data, expertise and all of the highly effective instruments at their disposal to create a successful automotive.

The 2019 season will see revised aerodynamic guidelines launched primarily to spice up overtaking. Right here’s what’s new:

Entrance wing

  • The entrance wing can be 200mm wider than final 12 months
  • Peak sees a rise of 20mm
  • It has additionally been moved ahead by 25mm
  • Intricately designed endplates have been banned in favour of a extra easy design
  • Groups at the moment are restricted to utilizing solely two under-wing strakes on both sides

These modifications will assist pursuing automobiles comply with automobiles in entrance extra carefully

Barge boards

  • The peak of the barge boards has been diminished by 150mm
  • They’ve additionally been moved ahead by 100mm

Rear Wing

  • The rear wing this 12 months can be taller
  • Its peak has been raised by 20mm
  • This may throw the wake of turbulent airflow larger into the air, successfully eradicating it from the trail of a following automotive
  • Its width has additionally been elevated by 100mm
  • The width of the DRS opening has additionally gone up by 20mm, making it about 25 % simpler in comparison with final 12 months

 

Brake Ducts

  • Brake ducts will even be quite a bit less complicated, limiting their use as a floor for aerodynamicists to use

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