Vodafone McLaren MP4-27 Mercedes

[PlatinumZealot]

And also important, comparison to flow viz in cfd

how would one do that? vector plot on the car surface?

[shelly]

plot of the lines of tangential strees at surface - so called oil flow

[PlatinumZealot]

tangential tress? Strange that you use that term to apply to this.

[Owen.C93]

Some more flo-vis for those interested. I assume the cleaner parts are vortices from the suspension, neat how they match up with the mirror, top of sidepod entry and the lower part as well.

http://www.flickr.com/photos/ferferferf ... otostream/
http://www.flickr.com/photos/ferferferf ... otostream/

[Pup]

If the exhaust blows down shouldn't we expect to see the flovis blown clear in front of the rear tire? It actually looks sort of stagnant instead. I wonder if that's why we're seeing debris collecting there. The 'stagnant' area does match up nicely with the debris...




It almost seems as if the exhaust is creating a shield that's preventing flow over the diffuser - that can't be right.

[shelly]

@pup: the perspective here is not good. the exhausts are aimed at the gap between the rear wheels and the diffuser footplate.
Stagnation in front of the rear wheel is the right thing to expect, and this high pressure region is exploited because it acts against the upper surface of the floor.

With a picture more from the top we should see, as you say, the paint being swept away by the exhaust plume on the side of the wheel

[Pup]

To me it looks like the stagnant area is worst right where we'd expect to see the exhaust blow, which is just inside and to the front of the rear wheel. But I guess we'll know more as the tests continue - as you say, it could be an illusion from the angle, or it could be that they just put a heavier coat of floviz there.

[bonjon1979]

If the exhaust blows down shouldn't we expect to see the flovis blown clear in front of the rear tire? It actually looks sort of stagnant instead. I wonder if that's why we're seeing debris collecting there. The 'stagnant' area does match up nicely with the debris...




It almost seems as if the exhaust is creating a shield that's preventing flow over the diffuser - that can't be right.

I don't know it looks to me like the airflow has all been sucked downwards at the point of the exhausts towards the diffuser. Maybe that's why there's no vizflow on the top portion of the sidepod after the exhaust.

[Owen.C93]

If the exhaust blows down shouldn't we expect to see the flovis blown clear in front of the rear tire? It actually looks sort of stagnant instead. I wonder if that's why we're seeing debris collecting there. The 'stagnant' area does match up nicely with the debris...

[img]http://farm8.staticflickr.com/7192/6855 ... _b.jpg[img]
[img]http://farm8.staticflickr.com/7192/6855 ... _b.jpg[img]

It almost seems as if the exhaust is creating a shield that's preventing flow over the diffuser - that can't be right.

I don't know it looks to me like the airflow has all been sucked downwards at the point of the exhausts towards the diffuser. Maybe that's why there's no vizflow on the top portion of the sidepod after the exhaust.

You have to keep in mind where they applied the flow vis. Obviously on the suspension and front of sidepods. I think there's probably some extra put near the floor as well to make sure they can look at that part extra closely (many teams have been trying different profiles around the diffuser and rear tyre).

[Richard]

I'm surprised no one has commented on the orange flow viz on the keel. It doesn't appear to have spread onto the side pods, does that mean it has all be captured under the floor?

ps - They'll be using the to correlate both the CFD and the wind tunnel results.

pps - The pit garage screens are common in testing so people can't snoop on secret development parts. In contrast, the pit garages have to remain open to view when the pits are open.

[beelsebob]

I'm surprised no one has commented on the orange flow viz on the keel. It doesn't appear to have spread onto the side pods, does that mean it has all be captured under the floor?

The splitter I take it you mean?

It's either that it's all going under the floor (which would be bloody impressive... Or they're really providing 0 air to that area. I suspect the latter – that they're using the snow plough to do the job of the splitter, and that really no significant amount of fast flowing air should be getting to the tea tray.

[shelly]

Most of the flow in the keel zone will go under the floor, it is not surprising not to see any orange on the sides

[hollowBallistix]

I really don't care if they this car is a dog, i'll be happy watching it as it's simply a stunning piece of machinery to look at ! especially with all the other cars being so damn ugly !!

It'll be interesting to see the development of the exhaust & some other features over the next two tests, i'm still amazed that they can run the car with the cooling port completely blocked off

[Hail22]

I really don't care if they this car is a dog, i'll be happy watching it as it's simply a stunning piece of machinery to look at ! especially with all the other cars being so damn ugly !!

It'll be interesting to see the development of the exhaust & some other features over the next two tests, i'm still amazed that they can run the car with the cooling port completely blocked off

Well remember its testing which means unlimited gearboxes, clutch sets, brakes, engines etc so they can have that inherit risk associated in doing so.

But also we need to remember the temperature on day 3/4 was freezing cold which the air going in (however small) was low in humidity yet very cool thus it would of had the same effect of lets say running FP2 in Melbourne on an Average Autumn day with the full port open.

[Shakeman]

I was watching the live times and Lewis was doing fast laps then slow laps quite regularly during testing. That could've been one of those slow laps.