Aerodynamic Discussion Thread
#664
Still that flow looks very wrong for some reason. If the air was really flowing past the verticals then you would surely see very high pressure zones under each. Maybe there is a large gap to the ground where the air can cross but the whole point of those fins is to prevent that happening. If the sim is correct why have the fins at all?
#665
What I was pointing as is that, thats a pretty nice solid model. Its just surprising someone is able to make something that nice on the model side but then not do something fairly simple like that, or even fail to catch it when just looking at the results. It really does look like the sims are ignoring that the strakes even exist.
Theres some other oddities, like how the flow separated on the inside of the tires without significant turbulence. And there's also quite a few surface errors as well which certainly arent helping. Looking closer I dont think this is a solid model, I think someone scanned this in.
Theres some other oddities, like how the flow separated on the inside of the tires without significant turbulence. And there's also quite a few surface errors as well which certainly arent helping. Looking closer I dont think this is a solid model, I think someone scanned this in.
#666
What I was pointing as is that, thats a pretty nice solid model. Its just surprising someone is able to make something that nice on the model side but then not do something fairly simple like that, or even fail to catch it when just looking at the results. It really does look like the sims are ignoring that the strakes even exist.
Theres some other oddities, like how the flow separated on the inside of the tires without significant turbulence. And there's also quite a few surface errors as well which certainly arent helping. Looking closer I dont think this is a solid model, I think someone scanned this in.
Theres some other oddities, like how the flow separated on the inside of the tires without significant turbulence. And there's also quite a few surface errors as well which certainly arent helping. Looking closer I dont think this is a solid model, I think someone scanned this in.
It looks ok but I know from my sims you sometimes need to bulk up the thin walls up to bigger than your cell size otherwise with the size of the cells let the air through like they are permeable.
#668
Saw the Silver-Car at the MSX yesterday. Was surprised to see these roof rails feeding the rear wing:
The car has a DTM type flat bottom/rear diffuser and fiberglass skirts in addition to the wing. One of the tech guys said they saw significant gains with those roof fins during their wind tunnel testing, and they made it on to the final version of the production car.
That thing weighs 900 lbs and has 200HP...
The car has a DTM type flat bottom/rear diffuser and fiberglass skirts in addition to the wing. One of the tech guys said they saw significant gains with those roof fins during their wind tunnel testing, and they made it on to the final version of the production car.
That thing weighs 900 lbs and has 200HP...
#669
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Join Date: Oct 2011
Location: The Race Track & St Pete FL
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Saw the Silver-Car at the MSX yesterday. Was surprised to see these roof rails feeding the rear wing:
The car has a DTM type flat bottom/rear diffuser and fiberglass skirts in addition to the wing. One of the tech guys said they saw significant gains with those roof fins during their wind tunnel testing, and they made it on to the final version of the production car.
That thing weighs 900 lbs and has 200HP...
The car has a DTM type flat bottom/rear diffuser and fiberglass skirts in addition to the wing. One of the tech guys said they saw significant gains with those roof fins during their wind tunnel testing, and they made it on to the final version of the production car.
That thing weighs 900 lbs and has 200HP...
#670
One the K1, those double as a swan neck wing mount. In the Silver-Car, the wing mount is separate. These are only for guiding airflow.
That car is rear engine and has a firewall behind the driver, so visibility is moot anyways in this case. It also doesn't extend all the way down the rear body work, it was about 4" deep after the immediate roof line. I understand it can act as a safety feature if sliding sideways, but I wonder if extending them to the leading edge of the wing provides benefits similar to spill plates on a splitter.
That car is rear engine and has a firewall behind the driver, so visibility is moot anyways in this case. It also doesn't extend all the way down the rear body work, it was about 4" deep after the immediate roof line. I understand it can act as a safety feature if sliding sideways, but I wonder if extending them to the leading edge of the wing provides benefits similar to spill plates on a splitter.
#671
Looking at this picture, the roof fins make sense. The roof has a nice gentle slope to "put the air back together" and feed air to the wing, but I'm sure the air gets super dirty once it drops over the edge onto the rear hatch window. The roof fins should help keep the air from the sides of the car from spilling in. Seems like just raising the wing up into cleaner air would have been more effective, though.
#672
many racing bodies don't allow the wing to be higher then the roof.
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#674
i got the 200. i am about to raise it to the roof line.
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#675
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Join Date: Oct 2011
Location: The Race Track & St Pete FL
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So I took some pics at 12 Hours of Sebring this past Saturday
C7R rear bumper
This I thought was a little weird, a plug hanging with a yellow extension cord
C7R rear wing of course
Ferrari Front fender
Viper's large front wheel well vents
Aston Martin #007 Front wheel well vents
Aston Martin #007 Rear Diffuser
Falken Tire 911 Porsche Rear Diffuser
Ferrari 458 Front Splitter
Ferrari 458 Rear Duct
Ferrari 458 Rear Wing with Step
Ferrari 458 Front Hood
Delta Wing's wing and about 1".5 -2" gurney flap right below the rear wing
Delta Wing Underbody channels and no those are not my feet
Delta Wing Front
Delta Wing Front Splitter
C7R rear bumper
This I thought was a little weird, a plug hanging with a yellow extension cord
C7R rear wing of course
Ferrari Front fender
Viper's large front wheel well vents
Aston Martin #007 Front wheel well vents
Aston Martin #007 Rear Diffuser
Falken Tire 911 Porsche Rear Diffuser
Ferrari 458 Front Splitter
Ferrari 458 Rear Duct
Ferrari 458 Rear Wing with Step
Ferrari 458 Front Hood
Delta Wing's wing and about 1".5 -2" gurney flap right below the rear wing
Delta Wing Underbody channels and no those are not my feet
Delta Wing Front
Delta Wing Front Splitter
Last edited by 1993ka24det; 03-25-2015 at 03:35 PM.
#679
it's interesting to see that the ferrari and DW almost don't want the high pressure air in the center of the splitter. the DW is flush with the front of the bumper, and the ferrari have big gaps. wonder why?
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