Khamsin Virtual Racecar challenge 2013 (CFD model racing)

[pocketmoon]

Hi, I'm not registered for this seasons challenge but would like to get to grips with sketchup/khamsin ready for any future event. I've tried the Ahmed Body tutorial posted a few pages back and also tried the Khamsin Kart walkthrough on youtube but my results are always way off.

Does anyone have a simple (or not so simple) sketchup/khamsin project I can use to validate my installation/config ?

Cheers

Rob

[Monster_Energy_F1]

Do you mean, you want somebody's F1 car?

[pocketmoon]

Do you mean, you want somebody's F1 car?

Nope. I just asking if anyone has a simple sketchup/khamsim project that I can load and run to validate my installation/config.

[N12ck]

Hi, I'm not registered for this seasons challenge but would like to get to grips with sketchup/khamsin ready for any future event. I've tried the Ahmed Body tutorial posted a few pages back and also tried the Khamsin Kart walkthrough on youtube but my results are always way off.

Does anyone have a simple (or not so simple) sketchup/khamsin project I can use to validate my installation/config ?

Cheers

Rob

please email:
julien@khamsinvirtualracecarchallenge.com

or email on this page about sorting khamsin: http://www.hibouscientificsoftware.com.au/contact-us

there you will be guided on why your previous sims went wrong

[Monster_Energy_F1]

With this tub I have, do I still have to raise it, or can i put it into my car, and then give it a stepped nose?

[N12ck]

With this tub I have, do I still have to raise it, or can i put it into my car, and then give it a stepped nose?

you have to use the same wheelbase, and the reference plane has to be at the height which is set on the supplied tub, does this answer your question?

[Monster_Energy_F1]

Kinda. So is this the tub that teams like McLaren and Williams and Ferrari are using?

[RicME85]

The tub is drawn to the basic dimensions set out in the regulations.

You cant just plonk this tub into your previous FS car as the wheelbase etc is all wrong, best off starting from scratch.

[Monster_Energy_F1]

This will sound stupid; but what's a wheelbase?

[RicME85]

the distance between the front and rear wheel centrelines

[Monster_Energy_F1]

Thanks Also just looking at the Splitter Area, there seem to be a few imperfections?

[julien.decharentenay]

Hi there. Nick, great job for following this up and keeping the conversation flowing. If you want to contact me, try info@hibouscientificsoftware.com.au or post on http://www.cfd-online.com with [KVRC] I am checking it more frequently than F1Technical.

Re wind tunnel model: please download from: https://dl.dropbox.com/u/40499338/KVRC2 ... 180mph.skp. It has annotations to try to explain how to set things up. Nick, can you supply the wheel/suspension for them to run the simulations?

For the 2012 test run, I used the following workflow:
- Set the car up in a stand-alone model (i.e group the body and the wheels in separate groups, i.e 5 groups) and then group the car in a single group;
- Move the car so that the front wheels are aligned with the red "x" axis with the car facing downwards (in a top view). The lowest point of the wheel is set to 5mm below the ground plane (z=0);
- Open the root model and copy and paste the wind tunnel around the car.
The above workflow requires that the car boundary conditions are setup again, but it is easier than trying to copy and paste the car geometry. The model provided should allow the way described above or to copy and paste the car geometry.

If you want to run preliminary simulation, you can neglect the tyre rotation and just copy and paste the whole car into the body group.

Wind tunnel only:
180mph scenario: https://dl.dropbox.com/u/40499338/root% ... 180mph.skp
100mph scenario: https://dl.dropbox.com/u/40499338/root% ... 100mph.skp
100mph scenario with 3degree yaw: https://dl.dropbox.com/u/40499338/root% ... %20yaw.skp

[seventhsin]

I registered a team days ago and have not received a confirmation email or the welcome pack.

You only registered a few days ago, aside from this I have not had time to process it due to being in hospital with a broken ankle, so apologies for not getting the email to you in time,

No apology necessary, I thought maybe I had slipped through the cracks. All the best for your recovery.

[RicME85]

Top work Julien, many thanks, should make our lives a lot easier. If Nick can get us the wheels and suspension then that would be good for the simulations but also for renders.

[wigglez28]

When you run simulations on the car do you take into effect the centre of gravity?