[MVRC] Mantium Virtual Racecar Challenge 2016

[RicME85]

Have been working in a car the last two days thanks to Matteo giving his car away.
I think it's enough of a departure from his design that it will be seen as a different car but at the same time hoping I can keep some of his hard work and good figures.

Sent from my MotoG3 using Tapatalk

[etsmc]

would anyone be willing to do a write-up or short video on how to open the case.foam file in ParaView and get something useful out of it. I know I have asked before and I have tried opening the case file as a decomposed case but all I seem to be able to get is the box that is the wind tunnel and some strangely shaped thing inside it at the very front that is off to one side. I know my case is running and I am getting meaningful results from it.
Still need to get some more front downforce and looks like i may be getting on top of my cooling.

[LVDH]

Welcome, Letouze!

A little infographic about the race:
http://i1372.photobucket.com/albums/ag3 ... ls189u.png

It's interesting to see how the situation is still messed up: top lift values are not concentrated on the podium, only CAEdevice managed to get 100% of the power (closely followed only by HP), and CoPs are still waaay out of the ideal value (during the last KVRC almost all the entries had values close to the ideal one).

So, I feel like we should have started with a non awarding point race to test the new software. On the other hand, the championship will be funnier because of this very same reason.

On my side, I experienced a severe loss of performance in comparison with the OCCFD software; about 20% downforce loss, mostly focused on the rear axle (minus 32% there...). Rear losses are probably due to near wall mesh improvements, which enhance boudary layer growth and consequent chain reactions. My very aggressive rear wing didn't help by that point of view.

In general, I have to say that I'm mostly scared by JJR, who has already a very good car (it doesn't even look like it was designed for high downforce. Instead, it produces more than anyone else... And has a the highest efficiency too. And it's even perfectly balanced). It only needs some more cooling.
CAEdevice has a very good car too, but lacks some front downforce. Increasing front downforce without decreasing cooling performance could be quite challenging.

A pity for SHM Racing, whose car seemed to be a very, very good start. Weird numbers...

Hi Variante,
I am not sure from where you have the numbers on the right hand side of your table.
What I liked about the results this race was that it was not like in the last KVRC races where the power was "digital" either 100% or 40%. This time the cooling duct design gave results inside the possible range. To understand why Matteo's car was so good I made a plot:

It shows the downforce the cars generated vs. their cooling performance. The dashed line shows a pareto frontier of some of the best cars indicating the trade-off between downforce and cooling performance. The cars are JJR, Variante and HP-Racing.
CAEdevice is far above that frontier showing how he simply managed to build a much better car. Also you can see that HP-Racing has way more cooling performance than everyone else except CAEdevice. Yet without JJR's penalty he would have been on position 4. This shows that cooling is not favored over downforce. Also keep in mind that JJR might have got all this downforce with an illegal floor, which should better not happen again.

would anyone be willing to do a write-up or short video on how to open the case.foam file in ParaView and get something useful out of it. I know I have asked before and I have tried opening the case file as a decomposed case but all I seem to be able to get is the box that is the wind tunnel and some strangely shaped thing inside it at the very front that is off to one side. I know my case is running and I am getting meaningful results from it.
Still need to get some more front downforce and looks like i may be getting on top of my cooling.

Can somebody help him? I am very busy today.

[CAEdevice]

Variante's analysis is interesting! I agree with almost everything, especially with the "no points giving race" proposal... that is why I ran (alone) about three "no point giving" races before Monaco

Seriously: the key of my first win, and of HP-Racing brilliant performance, is that before starting the design of the car, we both spent a couple of days installing and testing the CFD environement.

About the df/dr ratio: my car, when I only had 1.8m3/s of cooling flow, was around 4,8. To gain 1.2m3/s (100% engine power) costed about 20% of the effciency (but Virtual Stopwatch helped me to decide the right strategy).

Anyway: I still think that Variante and JJR will fight for the first and second placement during all the remaining races.

[CAEdevice]

would anyone be willing to do a write-up or short video on how to open the case.foam file in ParaView and get something useful out of it. I know I have asked before and I have tried opening the case file as a decomposed case but all I seem to be able to get is the box that is the wind tunnel and some strangely shaped thing inside it at the very front that is off to one side. I know my case is running and I am getting meaningful results from it.
Still need to get some more front downforce and looks like i may be getting on top of my cooling.

I could not record a video, but these two frames could help:

[RicME85]

Julien did a video ages ago that walked you through using the original Khamsin plugin and then extracting the result in Paraview. Its for reconstructed however (does that make a difference?) but I have always used is as a guide on how to get the most from Paraview - https://youtu.be/PwArEBv1iMY?t=1238

[variante]

I am not sure from where you have the numbers on the right hand side of your table.

That shows the actual CoP location, prior to the "dampening" (and the consequent downforce distribution over the front and rear axle). At least, that's how it was done in KVRC, and I thought we kept that system. EDIT: apparently the dampening formula has changed...how does it work now?

CAEdevice is far above that frontier showing how he simply managed to build a much better car.

While I agree that he has an edge over us, he needs to solve his balance problems in order to stay at the top (i need to do the same, unfortunately). And that might reduce the gap between the dashed line and his car, either by reducing rear downforce, or increasing front downforce at the expences of some cooling performance. Or maybe neither and he will win again.

[LVDH]

I am not sure from where you have the numbers on the right hand side of your table.

That shows the actual CoP location, prior to the "dampening" (and the consequent downforce distribution over the front and rear axle). At least, that's how it was done in KVRC, and I thought we kept that system.

I do not understand how you calculated them. The numbers are wrong. And the "dampening" is max 5cm. Even your own number is wrong. I sent out the reports with numbers a bit ago. You can check.

[pierlu99]

Hi, I joined yesterday in the campionship as Azzurro GP. I'm pleased to participate in this championship, the car is almost done , but where can I download WfloW ?

[variante]

I do not understand how you calculated them. The numbers are wrong. And the "dampening" is max 5cm. Even your own number is wrong. I sent out the reports with numbers a bit ago. You can check.

I did use the KVRC system. I've now updated the chart according with the MVRC system.

but where can I download WfloW ?

here (but you need to log in): http://mantiumchallenge.com/mvrc-the-rules/
Can't wait to see your car!

[pierlu99]

Thanks very much Variante! I saw your car, it's amazing, really interesting design!

[CAEdevice]

Welcome pierlu99!

[Alonso Fan]

welcome guys!

my car proves how hard this challenge can be

I hope you both do well

[etsmc]

would anyone be willing to do a write-up or short video on how to open the case.foam file in ParaView and get something useful out of it. I know I have asked before and I have tried opening the case file as a decomposed case but all I seem to be able to get is the box that is the wind tunnel and some strangely shaped thing inside it at the very front that is off to one side. I know my case is running and I am getting meaningful results from it.
Still need to get some more front downforce and looks like i may be getting on top of my cooling.

I could not record a video, but these two frames could help:

https://dl.dropboxusercontent.com/u/522 ... 922_01.jpg

https://dl.dropboxusercontent.com/u/522 ... 922_02.jpg

Thanks for the screen shots i didnt think i was doing anything wrong but i am sure i am not seeing the tick boxes for body etc. I have a simulation going so will double check when i get in to work tomorrow.

[pierlu99]

Thank you all! I know it will be difficult , but I hope to improve my car race after race and have some fun.