[MVRC] Mantium Virtual Racecar Challenge 2022 (Grand Prix Cars)

[Koldskaal]

https://mantiumchallenge.com/wp-content ... enders.gif


Homepage updates are coming...

HRT 2.0 great name

[Alonso Fan]

Take a look at the McLaren underside photos that have been posted, some interesting things going on there.

Really struggling to find time to produce a car at the moment. The closeness of races hasnt helped either. Doesnt help that I am wanting to move away from Sketchup but am struggling to get to grips with proper CAD modelling. I find Sketchup so intuitive. Latest software I have downloaded to try is CorelCAD

How about Fusion 360? It's free and easy to learn.

I have tried it. I think my problem is my brain just cannot adjust to the different type of modelling
I have a number of 3D printers and have used Fusion 360 a few times to create some very basic fixings to print. I read that disabling the part history is a good way for long time Sketchup users to switch to Fusion 360 but I still couldnt get there. I know what I want to do and how I would do it in Sketchup but translating that to Fusion or whatever other software causes such brainfarts.

Earlier I was messing around trying to make a basic F1 tub in Fusion but couldn't figure it out. I made one shape for the A-A bulkhead (as in the old F1 regs) and went to extrude it to B-B but once I had I couldnt work out how to adjust the dimensions of the surface that makes up B-B. I then tried a different approach, more akin to doing it in Sketchup where I started with A-A then drew a line from there to where B-B would be and tried to draw the shape for B-B but it was in completely the wrong place on the plane and I couldnt figure out how to move it.
Probably all just stupidly simple things to sort but between my brain (which is filled with loads of opiates on a daily basis) and not knowing the Sketchup to Fusion 360 name/tool differences just got me frustrated

Yeah I had this exact issue. Brain was so much in sketchup mode that I couldn't make complex shapes in proper cad software. The thing which helped me is blender. Allowed me to keep a lot of sketchup in my brain but sped up the process by miles and allows to create lower polly meshes and subdivide later for more detail. Will still be a learning curve and will still take you time to adjust but I find a lot of the sketchup stuff is transferable once you get the hang of it.

[LVDH]

During KVRC times, I also used Blender. I think it is a great software to create funny curved shapes. And with some knowledge of how to use Python, you can parametrize your geometries and have optimization software take care of finding the best shape. Now that is for advanced users. But while Blender for sure is no CAD software, I think it is just great for aerodynamics people that have to create many funny shapes.

[Ft5fTL]

https://mantiumchallenge.com/wp-content ... enders.gif


Homepage updates are coming...

I dont see my car here. Should i be worried?

[JJR]

My car is also missing.

[LVDH]

OK, sorry, that is pretty strange. But I have personally seen both cars, prepared them for CFD and rendered them. No idea how they got lost during the gif generation.

[BlueCheetah66]

How much difference does using the MVRC_Long settings make to the CFD results compared to the MVRC_Fast?

[yinlad]

How much difference does using the MVRC_Long settings make to the CFD results compared to the MVRC_Fast?

I think it's been said to be in the region of 20% more downforce, particularly around the floor. I'm sure someone will correct me. It's in this thread somewhere

[CAEdevice]

How much difference does using the MVRC_Long settings make to the CFD results compared to the MVRC_Fast?

The difference is big from "fast" to standard, very small from standard to "long"

[spacehead3]

I noticed that Andre snuck some CFD images into the website when we weren't looking: https://mantiumchallenge.com/cfd-images ... mvrc-2022/

[CAEdevice]

I noticed that Andre snuck some CFD images into the website when we weren't looking: https://mantiumchallenge.com/cfd-images ... mvrc-2022/

Thank you! Very very interesting to see how variable is the flow. I could look at these images for hours trying to imagine the reason of such different pressure fields.

The vortices clearly reveal 2022 or 2021 approach for the wing design, cool.

Two cars have a completely wrong ground clearance

PS: there are some asymmetric areas. Does it mean that a full car has been simulated?

[G-raph]

That's very useful, thank you for posting these!

I think the pictures for JJR and Variante are from their first "rogue" CFD runs with the crazy numbers, wrong ground clearance and asymmetric results (as Matteo mentioned). It would be good to get these updated to the proper results, so we can compare everyone properly.

[variante]

How much difference does using the MVRC_Long settings make to the CFD results compared to the MVRC_Fast?

For my car, the one i raced last time:
FAST: CD=1.378 CL=2.725 CoP=1.759 Cooling=1.245*2
MEDIUM: CD=1.388 CL=3.394 CoP=1.834 Cooling=1.273*2
LONG (official): CD=1.335 CL=3.277 CoP=1.751 Cooling=1.195*2

[LVDH]

I think the pictures for JJR and Variante are from their first "rogue" CFD runs with the crazy numbers, wrong ground clearance and asymmetric results (as Matteo mentioned). It would be good to get these updated to the proper results, so we can compare everyone properly.

They are and I just fixed this, but you guys were faster than me....
Did JJR and Variante receive the correct reports?

How much difference does using the MVRC_Long settings make to the CFD results compared to the MVRC_Fast?

This really depends on your car. What others suggest might, be true for their car but might as well be very wrong for your car. You have to check for yourself. The computing requirements in MVRC are pretty low, but I do understand that some people run on laptops and might not be able to really run "full" MVRC simulations.

[CAEdevice]

I copy the link again for simplicity: https://mantiumchallenge.com/cfd-images ... mvrc-2022/

What do you think about? I appeal to professional aerodynamics. I consider Cp_Tot a bit like a measure of the amount of energy present in the fluid: is it better to have still energized air to come out of the diffuser or not?