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Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 00:48
by RicME85
You mean the 2d images with the bars showing where the down force is across the car?
Also included in the OCCFD results.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 01:05
by Alonso Fan
RicME85 wrote:You mean the 2d images with the bars showing where the down force is across the car?
Also included in the OCCFD results.
ah yes, I've just read through them all now. that's really cool, thanks
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 01:10
by Alonso Fan
RicME85 wrote:You mean the 2d images with the bars showing where the down force is across the car?
Also included in the OCCFD results.
what is the difference between cop and corrected cop?
which value is the one I should use?
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 01:24
by RicME85
Use the non corrected one to adjust the balance.
Not sure what the deal is with the adjustment.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 01:33
by Alonso Fan
RicME85 wrote:Use the non corrected one to adjust the balance.
Not sure what the deal is with the adjustment.
Thanks
Wow occfd is amazing. I never knew that it could output a results report. With Autodesk sim cfd I'd have to go through menus and menus to generate plots. This is truly amazing, words cannot explain how amazed I am. I didn't expect free software to be able to do so much, I'd just like to thank all those involved with occfd, because I'd never be able to use openfoam manually. And thanks to all who helped me with other things, you guys are awesome
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 01:37
by machin
Yeah; uncorrected is the "real" figure... The corrected one is the one used to generate the lap time... Essentially, the corrected value represents the small changes that a race team would do at the track to balance the car: for us that means competitors don't need to have their balance spot on when they submit their car.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 13:05
by machin
variante wrote:Guys, what do you think about publishing CFD images, like this one, after each race? We used to do it during the first KVRC season, where this pic comes from
https://lh3.googleusercontent.com/-H8S2 ... 180mph.png
Showing only the upper side of the car doesn't represent an actual threat for those who wish to keep their know-how for themselves. On the other hand it would help getting a better grasp on how aerodynamics works with less important (performance wise) but nonetheless interesting elements. And that is worth for both, more and less experienced people.
It would also underline, to people facing KVRC for the first time, the fact that this is a serious aero competition, not a beauty contest made only of cool renderings.
I like that idea... In fact... I 'd go further and suggest
replacing the pre-race renderings with the Upper-surface pressure plots... That means there is less work for Chris to do.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 13:09
by cdsavage
It would save a lot of time for me. Perhaps renders only for the winner, or the top 3?
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 13:31
by RicME85
Most of us produce renders anyway
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 14:49
by machin
Yeah, I would leave renders to competitors... If they want to make them.
How about this:
All cars before lap times: front isometric surface pressure plot.
Top three after lap times: rear isometric surface pressure plot (i.e. Not showing the "sensitive" under floor areas)
...?
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 16:37
by LVDH
I always enjoyed all the renders very much.
They give us something to speculate and talk about. Seeing all these different cars is very cool.
If you guys need help I can develop a Blender script which could create all of the renders.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 16:51
by machin
I thought the renders looked cool too... But I do think a top-surface pressure plot of each car would give even more talking points....
.... And we can still speculate about the lower (hidden) surfaces....
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 16:57
by cdsavage
The time-consuming part is the manual cleanup necessary to be able to use smoothing. Most of the Sketchup entries would look quite bad in the renders without this cleanup. The models created in traditional CAD packages were generally much cleaner and easier to work with.
I generally agree with the idea that presenting images from post-processing helps emphasize that the competition is based on real CFD results. But I am happy to go with whatever you guys would prefer.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 17:16
by LVDH
But the CAD clean-up is mainly for the CFD process right?
If you need it for the super cool renders you could export the surfaces files from the mesher as they are pretty much a wrap. Obviously they are not very nice if you look too closely but you get them for free.
Re: Khamsin Virtual Racecar Challenge 2016
Posted: 27 Mar 2016, 18:00
by cdsavage
This is a separate process from the pre-CFD cleanup. The goal is for the rendered car to not be visibly faceted, and usually it takes some manual modifications for that to work well if the underlying geometry is not clean. I'll have a look at using the surfaces from the mesher.