[MVRC] Mantium Virtual Racecar Challenge 2017

[Alonso Fan]

Thanks this is really helpful

I did a simulation on the intro car today and wow such a simple car but such decent downforce.

What I can't understand is that my car has similar geometry but generates much less downforce. I have very similar rear and front wings but I'm producing half the downforce.

How much difference does the shape of the wings actually make?

I'm due to run two simulations tonight and might share something tomorrow to get some help

[rjsa]

A couple degrees in the same wing can stall it and ruin every thing. The new solver is even more sensitive than the 2016 version.

[Alonso Fan]

A couple degrees in the same wing can stall it and ruin every thing. The new solver is even more sensitive than the 2016 version.

But nothing is stalling. I'm just not getting the kind of pressure difference seen on the intro car, across my wings eventhough they are similar in many ways

[machin]

This is the car that i used on the last race:

http://i.imgur.com/ihKQ88b.jpg
http://i.imgur.com/5y9IB9B.jpg
http://i.imgur.com/LsYI7vC.jpg
http://i.imgur.com/XtZV3hl.jpg

Nice! That's what I like to see! Interesting flow patterns on the upper surface of the front splitter and rear wing... Compare it to Matteo's (CAE Device) flow lines in the same places...

[Ft5fTL]

This is the car that i used on the last race:

http://i.imgur.com/ihKQ88b.jpg
http://i.imgur.com/5y9IB9B.jpg
http://i.imgur.com/LsYI7vC.jpg
http://i.imgur.com/XtZV3hl.jpg

Nice! That's what I like to see! Interesting flow patterns on the upper surface of the front splitter and rear wing... Compare it to Matteo's (CAE Device) flow lines in the same places...

Dive planes, monkey seat and the p-duct affects the flow pattern that goes to the rear wing heavily.

[etsmc]

Interesting to see the intro class difference come down from 1.3s to 0.4s

Will have to see if I can get time to do some images like the others of my car...

[RicME85]

Intro should converge over time really, surprising it has so quickly.
Gonna have to put some serious work in to get some more from the front end as the balance still isn't great.

[RicME85]

A couple degrees in the same wing can stall it and ruin every thing. The new solver is even more sensitive than the 2016 version.

But nothing is stalling. I'm just not getting the kind of pressure difference seen on the intro car, across my wings eventhough they are similar in many ways

Might look similar but there are a few variables that can have an effect. Have a play with the CAESES tool and see just how many different wing profiles you can create just by tweaking the chord then do it again tweaking the other settings.
Designing your own airfoils from scratch isn't easy, the tool for the intro car makes it a lot easier, just need time to find the performance of each iteration.

Does anyone recommend and easy to use 2d flow simulation for testing airfoil performance?

Also, will we ever get downforce/drag figures in the CFD report from MantiumFlow for wings so we can see what they produce?

[Alonso Fan]

A couple degrees in the same wing can stall it and ruin every thing. The new solver is even more sensitive than the 2016 version.

But nothing is stalling. I'm just not getting the kind of pressure difference seen on the intro car, across my wings eventhough they are similar in many ways

Might look similar but there are a few variables that can have an effect. Have a play with the CAESES tool and see just how many different wing profiles you can create just by tweaking the chord then do it again tweaking the other settings.
Designing your own airfoils from scratch isn't easy, the tool for the intro car makes it a lot easier, just need time to find the performance of each iteration.

Does anyone recommend and easy to use 2d flow simulation for testing airfoil performance?

Also, will we ever get downforce/drag figures in the CFD report from MantiumFlow for wings so we can see what they produce?

Had a play with CAESES yesterday and I have to say I am hugely impressed. Also very happy since I was able to produce something which has twice the downforce of my current unsubmitted car. Might jump down to intro class for the next few high df races then back up to full for the low df races.

[CAEdevice]

Does anyone recommend and easy to use 2d flow simulation for testing airfoil performance?

It could be useful for the rear wing (considering that the flow that the flow that sorrounds it is not exactly parallel to the ground) in the low df setup. In my MVRC experience, if always had to design an airfoil section after two or three iterations with the full 3D model.

Btw: I am using the same base airfoils of the previous season, with very small changes.

[CAEdevice]

About revealing more details of the car: this is the car that won in Monaco. I hope TF and JJR will not see it.

[LVDH]

Good work guys, this new back found openness has probably lead to a new team. I will add it to the page as soon as a car is submitted. From now on I will always do it like that. I hope there will be more CFD images, otherwise I will take some action. This championship is about winning but also about learning and showing CFD skills and nice images. So I hope you guys can keep this up. You should have received your reports from last time. Full results can be found on the challenge page. CAEdevice seems to have made his car worse compared to race 1. JJR has lost some downforce but rebalanced the car to take the victory. His car is quite unique, you should all analyze it as good as you can.

[CAEdevice]

CAEdevice seems to have made his car worse compared to race 1

Yes, with the new solver I had problems with convergence (the car is almost identical to the one I used in Race 01).
I noticed that you run 3500 iterations, so the DF was lower than expected: not a problem at all, because JJR performance was so good that it would be impossible for me to win anyway.

About revealing the cars: considering that the intro car completely shows the concepts behind my car together with the CFD and CAD images (including the gif animation above). I can't think about other ways to show more (excluding sexy photographs of the designer himself!). I will wait and see what the other top teams will do.

Generally speaking: in an "real" race we could not see pressure textures or surfaceLIC images, but fur sure we could see much more geometric details. I was thinking about a 3D model (on GrabCAD for example) with some limitations about the underfloor.

[darkpino]

Wow! This looks pretty neat! Is there some tutorial how to get started?

[Alonso Fan]

Wow! This looks pretty neat! Is there some tutorial how to get started?

Register at mantiumchallenge.com and start modeling your car. Everything you need with regards to the rules, files and software is there

Welcome!