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Re: Khamsin Virtual Racecar Challenge 2015
Posted: 10 Apr 2015, 21:16
by CAEdevice
Variante: you should try to run occfd with or without rear wing refinemet. It will be enogh to include the wing into the body component, without giving it a name containing the word "wing"
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 10 Apr 2015, 21:22
by cdsavage
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 10 Apr 2015, 21:30
by CAEdevice
wow! they look aggressive!
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 10 Apr 2015, 23:56
by RicME85
They would look fantastic on track attacking each other
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 00:11
by machin
Wow, seriously cool, I'm just going to quoe the images so we get the team names up;
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 00:47
by machin
Is this the first time we've seen the JJR car? Looks good (as they all do). Excellent variety...
Who are we thinking will have the fastest car round the lap, and who do we think will have the highest top speed down the start/finish straight?
How close do we think they're going to be? Do we think there will be any surprises?
Is the Dynarace car actually racing? I like the look of it...
"That" wing Variante; Lovely modelling! Can't wait to see the coefficients and balance...
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 06:51
by etsmc
Wow my car looks good when you guys do tje render... i dont think i have much home from the results i got i have next to no rear downforce.
Drag: 1344.51 N
Drag coefficient - Cd: 0.64
Drag area - Cd.A: 1.12 m2
Downforce: -1291.01 N
Downforce coefficient - Cl: -0.61
Downforce area - Cl.A: -1.08 m2
CoP of downforce: 0.848 m along streamwise (Y) direction from Y = 0.00 m.
KVRC Only: Corrected CoP of downforce: 1.249 m along streamwise (Y) direction from Y = 0.00 m.
Manual calculation of CoP (uncorrected): 1.034m from Y = 0.00m.
Manual calculation of CoP (KVRC only - corrected): 1.342m from Y = 0.00m.
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 09:18
by machin
You're Mercury Motorsport, right? The torquoise car above?
Did you use the "Savage" rear wing elements? From the Render the wing looks ok... Obviously we can't comment on the diffuser...
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 10:37
by AratzH
Wow! This year's entries look awesome! Congrats to all the teams. There is a lot of variety, even thought they all look pretty LMP'esque. I wonder if someone will try some more agressive and imaginative solutions for race 2.
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 12:54
by variante
Great variety indeed. They all look very good: everybody knows how cars aerodynamics work, for sure! Well done, everybody.
@etsmc: since you posted the numbers, i'll make some considerations about.
First thing i would do to increase downforce, especially on the rear axle, is raise the rear wing up, to put some distance between the airfoils and the rear wheels arches and rear deck (in order to avoid downforce dissipative interactions between those elements).
Then, i would focus 99% of the development on the diffuser: it is just not working, for some reasons.
machin wrote:Is the Dynarace car actually racing? I like the look of it...
Indeed. Would be good news!
machin wrote:"That" wing Variante; Lovely modelling! Can't wait to see the coefficients and balance...
CoP=1.312m; CoP corrected=1.481m. The private tests CoP was 1.65m
(BTW, Julien, what is "manual" CoP??)
For the rest, machin, you'll have to wait a little more
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 17:24
by machin
variante wrote:
CoP=1.312m; CoP corrected=1.481m. The private tests CoP was 1.65m
For the rest, machin, you'll have to wait a little more
Haha, intriguing!
For a bit of fun, here's my estimates;
Well developed two tier, full width front wing; Cl.A = 3.5
Well developed diffuser, Cl.A = 2.2 (with slight rear bias)
Single tier, twin-element full width rear wing, Cl.A = 2.3
So I'm guessing total Cl.A of 8 or there abouts???
Front wing Cd.A = 0.9
Rear wing Cd.A = 0.6
Main body Cd.A = 0.72
So, I'm guessing total Cd.A of 2.22 ????!!!
Ha ha, am I close?!
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 18:03
by etsmc
Yeah mine is the mercury motorsports. Will take the suggestion on the rear wing makes sense. The diffuser was short didnt read the rules properly got a new car i am working on for the next race. Should have a better rear end.
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 18:43
by cdsavage
Some speed data from the Nurburgring:
Code: Select all
Speed trap 1 Speed trap 2
(straight) (Schwalbenschwanz apex)
Brook Motorsport 151.3 66.9
CAEdevice 167.9 72.3
DH Racing 184.9 67.4
DynaRace 174.0 70.3
JJR Racing 168.7 74.3
Mantium Racing 176.7 70.1
Mercury Motorsport 191.0 66.7
Pure Power Racing 169.3 67.7
TF 187.6 68.6
Variante 167.2 74.6
[/size]
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 18:50
by machin
Oooo; very close between JJR, CAE device and Variante in both places... And good top speed from Mercury Motorsport.... But don't read too much into top speed at the Nurburgring.... The corners is "where it is at".... Still, it's all about getting a good compromise...
Re: Khamsin Virtual Racecar Challenge 2015
Posted: 11 Apr 2015, 18:53
by julien.decharentenay
variante wrote:(BTW, Julien, what is "manual" CoP??)
The manual CoP is because I am not using the right height in the CoP calculation done automatically in OCCFD - Andre from MantiumRAY advised me that my calculation was incorrect. But it was only a week or so prior to the race 1 submission. So I used the old fashion way (incorrect) and a manual calculation of the CoP. We ran Virtual Stopwatch with both and picked out the best one...
The last CFD simulation ran successfully last night - after a few headaches. I am feeling relieved that we will be able to get the results on time...
