W06 Influenced CFD Study

[shelly]

Talking about animals, this thing is between deer and moose horn

http://oi61.tinypic.com/16it7oj.jpg

I've got at least this y250 area streamwise acceleration, remember that toro rosso screen picture
http://oi62.tinypic.com/2hgy5w7.jpg

Are you sure that it is streamwise? The scalar field label says "velocity magnitude". Is it x-velocity or vector velocity? If the 2nd, do you have a picture of the field of x-component of velocity?

[chuckdanny]

Oh yes you're right, i had seen it and i showed another one, maybe i wanted to show also the speed distribution on the wing,i don't remember.

here it is, but you meant Z component? Or am i t0o close to sleep?

[Just_a_fan]

Some lovely images there. How does the flow look with a rotating wheel behind the wing?

[chuckdanny]

A wheel behind a wing? What a strange idea?

Qualitative flowvis correlation :


Ok!
What? discrepancies?
No, it's perfect.

Unfortunatly, the most important part is not that great, i mean it's messy, not well defined (although i don't know how it's supposed to be). Ok the gutter is hanging a little too much which trigger a strengthier vortex which may interact adversely with the arches one.
The arches vortices are triggered as expected right after the venturi throat in the expansion area (suction pic), i've got to reshape the outward flow of the slots.
It seems that the pattern would be a gutter vortex that flows inside the tire (providing more air there) while the slot vortex goes on the outside (kruger effect on the way...). Unless the strakes change the picture...

[turbof1]

Awesome stuff Chuck! I love the comparison with the real life flow viz one. Even though the the pictured wing is the pre-arched wing, the endplate remains the same, so the flow on the outside of the endplate should very much comparable.

The strakes is something we desperately need
right now. I'd ask everybody who watches this thread to look out for those.

[George-Jung]

Are strakes these things attached to the underside of the front wing?
If so, this is what I found of the W05.. if it is incorrect, please remove post.

[turbof1]

Not removing it (you tried to help, which is appreciated) but they changed the strakes since China. We know a few things:
-Shape has changed
-Positions have changed
-They reduced the amount from 4 to 3.

We don't know shape and dimensions.

[chuckdanny]

THanks turbof1 and george-jung. We need a f1 photograph that is like a paparazzi !!

[chuckdanny]

Proposition :

Gutter and arches vortices act as one improving the flow captured by the front wing, extending in a way the wing span.


The strakes delineate precisely the interface between y250 vortex region and gutter/arch vortices region.

For 3 reasons, one to reduce/control the inside tire wake extension.
two, to work the wing properly.
three, to guide precisely the gutter vortex in the pincer that catches it and keep it close to the low pressure wake area

The V section of this new version is indeed controlling downstream the path of turning winglet merging vortices


Like the endplate on this R28 cfd. The goal being the alteration/modification of the inside trailing vortex of the tire which has the bad habit of spilling into the floor gap.


Like Bhall says : let the beating begin !! or let's start your beating...

[bhall II]

First, that's excellent work. Sincerely.

Second, you have a unique nomenclature for some components that's not entirely clear to me. Can you point out the "gutter," "pincer," and "v-section"?

Lastly, I think the model needs some refinement, particularly with regard to wing/wheel interaction.



The wheel should be wider, closer to the wing, slightly re-profiled, and it should have a negative camber angle of about 3-4°. The appendages mounted to the outside of the vertical end plate should also extend all the way to the edge of the footplate. Or maybe the entire vertical end plate assembly just needs to be pushed farther outboard.

It's puzzling to see so much air flow going inside the wheel given a wheel placement that more closely mimics a 2009-2013 no-doubt-about-it outwash wing. That's a head-scratcher. (Or maybe I just need to wash my hair.)

But, seriously, that's great stuff. It's the best CAD model I've seen on this site, and by a fairly wide margin, too.

[Samraj_official]

all these complex designs would be out of f1 if f1 adopts f-e style closed front wheels and closed rear wheels which would provide more efficiency in a straight line

[argi2007]

Chuck, can you give us some information regarding the downforce and drag of the wing (at what velocity)?

[chuckdanny]

Thanks Bhall !

The components i'm referring to:


The Lobster pincer (turbof1 patented) that may catch the supposedly inside flowing gutter vortex:


Yes that's right i have to refine those shapes proportion, for the tire that's what i've got :

I've a 255mm tire width, i have messed up the flank adding 10 mm instead of cm i suppose.

@argi2007
i will.

[bhall II]

The wing's probably not going to show its true colors until it's run through some sort of cornering simulation with a steered wheel, if not a spinning steered wheel. All the same, never in a million years would I have ever considered the possibility that the underwing strakes act as "vortex separators." At least one rival design suggests a different purpose, but damn.



I hijacked a diagram that might help you tidy up the dimensions of the end plate, which seems to be a bit inboard from where it should be. If so, that might be one reason for the wing's apparent paradoxical inwash flow.

Then again, as those who've seen me drone on and on about it can attest, I've long been of the mind that post-2008 front wings are far less efficient with the wheels pointed straight ahead as they are otherwise. But, I've never really considered what it might look like, and maybe that's it.

How far are you planning on going with this?

[chuckdanny]

oh yes it looks like the old technical rulesbook, i don't have it, do you know where to find it?
I've got the span and the height right thanksfully but the endplate is 3cm shorter for some reason, it's the 775mm dimension no doubt?

The mclaren front wing is quit different, what are you seing ? The equivalent of arches vortex kept in the outside position? In order to fully or better develop streamwise while wheel is turned inside? The ackerman angle should be taken into account also which mean a greater angle for the inside wheel. You're right the yaw angle should have a big impact.

How far are you planning on going with this?

I will not be able to do the asymetrical model, it would need to double the cell budget