[MVRC] Mantium Virtual Racecar Challenge 2018

[machin]

I guess it's my turn now, so here it is:

https://i.imgur.com/zsShe0G.jpg
https://i.imgur.com/qNLVymJ.jpg

I've made a couple of last minute changes that i haven't tested yet...hopefully they won't mess up the flow structures...
I'm fairly happy with what i've got, but it's not as optimized as the high efficiency car i made.

So it seems nobody (yet) has gone for an “infinity wing” arrangement... I presume this was mainly to avoid disturbing the well developed lateral flow from the sides of the car into the diffuser?

[variante]

I guess it's my turn now, so here it is:

https://i.imgur.com/zsShe0G.jpg
https://i.imgur.com/qNLVymJ.jpg

I've made a couple of last minute changes that i haven't tested yet...hopefully they won't mess up the flow structures...
I'm fairly happy with what i've got, but it's not as optimized as the high efficiency car i made.

So it seems nobody (yet) has gone for an “infinity wing” arrangement... I presume this was mainly to avoid disturbing the well developed lateral flow from the sides of the car into the diffuser?

Surely it wouldn't work for me. Any bigger wing close to the ground would result in a huge disruption of the diffuser flow, and would also interfere negatively with the little ramps that i have before the front wheels.
Other layouts, like CAEdevice's, would surely give better results with aggressive front elements, such as the infinity wings.

Come on guys, show your cars! I'm curious! No need for fancy renders...

[Ft5fTL]

I guess it's my turn now, so here it is:

https://i.imgur.com/zsShe0G.jpg
https://i.imgur.com/qNLVymJ.jpg

I've made a couple of last minute changes that i haven't tested yet...hopefully they won't mess up the flow structures...
I'm fairly happy with what i've got, but it's not as optimized as the high efficiency car i made.

So it seems nobody (yet) has gone for an “infinity wing” arrangement... I presume this was mainly to avoid disturbing the well developed lateral flow from the sides of the car into the diffuser?

That wing arrangement would not work on my car.

This one is an earlier version what i sent in for the race. As you can see the majority of the diffuser flow comes from the sides. Maybe Caedevice could have used something similar to that wing arrangement with his sealing the side concept.

[CAEdevice]

I confirm that infinity wings would be a good idea for my car, the reason why I did not use them is simple: not enough time to refine it. I only did 10 simulations between the last two races.

[roon]

I guess it's my turn now, so here it is:

https://i.imgur.com/zsShe0G.jpg
https://i.imgur.com/qNLVymJ.jpg

I've made a couple of last minute changes that i haven't tested yet...hopefully they won't mess up the flow structures...
I'm fairly happy with what i've got, but it's not as optimized as the high efficiency car i made.

T-wings on the front v cool. And it's meme optimized:

[variante]

I guess it's my turn now, so here it is:

https://i.imgur.com/zsShe0G.jpg
https://i.imgur.com/qNLVymJ.jpg

I've made a couple of last minute changes that i haven't tested yet...hopefully they won't mess up the flow structures...
I'm fairly happy with what i've got, but it's not as optimized as the high efficiency car i made.

T-wings on the front v cool. And it's meme optimized:

https://ih0.redbubble.net/image.4841628 ... t,t.u1.png

Hahah yeah...I'm not too proud of how they look... But they seem to work, with a slight increase in total downforce and efficiency. Gains on the front axle only, where i mostly needed it.

[etsmc]

I have always run a monitoring surface down the side of the floor, Interesting to see that air is drawn in from quite a far way out from the car.


I have just tried to design an infinity wing because I have nothing else to do on my lunch breaks now (come at me F1 style cars) its by no means refined or elegant but interested to see if it does affect the flow into the diffuser from the side of the car.

[machin]

Would be interested to see the results of your infinity wing study...

[machin]

Hey guys, Scrutineering is complete... you can find the official post here:-

https://mantiumchallenge.com/scrutineer ... peak-2018/

Unfortunately we felt that we had to apply a penalty to Pure Power and Mercury for repeated violations of exceeding bodywork limits....

Mercury; violation above rear wheel:



Pure Power: a number of violations also around the rear wheels:-

[etsmc]

Would be interested to see the results of your infinity wing study...

Study makes it sound so impressive

I have some numbers in and the flow on the sides of the underfloor area has changed.

pikes peak wing 0.997542m3/s
infinity wing 1.06819m3/s

Diffuser flow has also increased ever so slightly
pikes peak wing 2.14825m3/s
infinity 2.14872wing m3/s

but this i am sure is from the increased flow at the front of the floor
pikes peak wing 1.18441m3/s
infinity 1.21038wing m3/s

I will try and get an image or 2 uploaded later today.

[etsmc]

So I have pulled a couple of images together so you guys can see the differences between the PikesPeak wing and the Infinity wing.


final results are also a surprise

Pikes Peak wing
cd: 1.526 cl:6.316 cl/cd:4.138 cop: 1.680
central section of the front wing cl/cd: 11.600
Pikes Peak side extensions cl/cd: 2.381

Infinity wing
cd: 1.484 cl: 6.373 cl/cd: 4.294 cop: 1.663
central section of the front wing cl/cd: 11.243
Infinity side extensions cl/cd: 3.210

Please remember my Pikes peak wing was just thrown together but so was the infinity wing. it does, however, look like it can make a lot of downforce with little drag.

you guys are the experts though so what do you make of it.

[machin]

That’s cool; I love these kind of direct comparisons! You’ve got a good car there, with some good coefficients... you should have more faith in your abilities.

I guess that Variante will say that your Pikes Peak wing, with that low (just above ground) highly cambered wing element outboard of the front wheels already negatively affects floor flow... on his design he has no aerofoil here for that reason... do you know how the infinity wing compares to your car without the Pikes Peak wing, particularly the flow through the diffuser?

[etsmc]

That’s cool; I love these kind of direct comparisons! You’ve got a good car there, with some good coefficients... you should have more faith in your abilities.

I guess that Variante will say that your Pikes Peak wing, with that low (just above ground) highly cambered wing element outboard of the front wheels already negatively affects floor flow... on his design he has no aerofoil here for that reason... do you know how the infinity wing compares to your car without the Pikes Peak wing, particularly the flow through the diffuser?

I have a case that was before any of the Pikes Peak changes
Pre Pikes Peak case
cd: 0.961 cl:4.108 cl/cd:4.273 cop: 1.753
central section of the front wing cl/cd: 10.067

Side underfloor 0.745277m3/s
Diffuser Flow 1.98378m3/s
front floor flow 1.37769m3/s

My guess is could the PP rear wing be working better with my large diffuser area and pulling the air out of the diffuser better? allowing a higher flow of air from the sides and under the floor?

My abilities still seem to be driven by luck but I would really like it if post-processing included visualisation of the flow streams because I don't always get time to fire up paraview and do the whole surfaceLic and that seems to be where I find most of the gains.

[variante]

Cool experiments! It seems that "Infinity Wing" does have some positive effects on your car, especially around the diffuser area!

But, as Machin predicted, i'll say that it's not necessarily an improvement compared to no wing at all. Now, i have a weird Front Wing, so I might be the exception there; but our diffusers should behave similarly. And it's indeed the diffuser the weak point of your car, the part you should focus development on. Here's mine for comparison:



The big Rear Wing surely helps it. But helps even more playing with diffuser angles, throat transition,... Even a few simulations will boost your performance. Meanwhile, always make sure it receives enough air (and from the right directions) to fully express its potential.

Aside from that, yours looks like a good car. It's pity you (and Pure Power) received that penalty, cause it could have been an interesting season finale...

[CAEdevice]

I did not try the Infinity wings, but this is the Cp graph of my car for PP (I like these comparisons at the end of the season)



Interesting how differently our diffuser works