It’s almost like you’re reading into my mind. Initially My oil cooler setup took air in the cabin ventilation to exit INSIDE the wheel arch which is opened behind the wheel. THEN: Thinking the wheel rotating would interfere with the hot air exiting, I decided to channel very carefully the hot air, to a laminar region on top of the rear fender (where you’ve put the little spoiler in your simulation). I’ve haven’t noticed a huge difference, now I know why. THANK YOU VERY MUCH FOR YOUR VIDEOS.
Check out a paper titled "The Effect of Camber and Yaw Angle on the Aerodynamic Performance of Rotating Wheels in Contact with the Ground" 2015. It shows that toeing the wheel in increases the tire squirt vortex inboard of the tire, and diminishes it outboard. When you toe out the wheel the inverse happens. Obviously you can't just run massive toe out, tire wear, tire heating, and stability will all suffer. However what you can do is create outwash inboard of the tires. This will make the relative airflow the tire sees as if it were toed out, without physically having to run massive toe out. This is the logic behind the M4 GT3 race car, the Porsche GT3 RS, F1 cars, LMP cars, etc. What this does is reduce the tire squirt inboard of the tire, so it affects the floor far less.
With one of the early videos with the suzuki a particular configuration of the splitter and the air dam holding it on does something very similar. Everyone runs a round edge/corner, but If you cut out the corner and push the air at the wheel there is such a performance benefit.
I'm no areo dynamics expert but as car enthusiast and dodge viper lover , the difference between the ACR hood and gts hood is that the ACR has massive holes (vents) right above the wheels (that cover Approxmeate the length and widths of the wheels) to remove pressure and no elongated wheel archs , just something I understood why it was done more than before thanks for the vid
Maybe adding airflow for brake caliper cooling would change the low pressure behind the wheel. That flow directed up and out by the louvers could help get that air from going underneath the car by a miniscule amount too. Also, love that book.
super tourers had an interesting solution, venting out from in front of the front wheel. It not in a video, its from a model before I was making videos, when I do the front corner I'll show what they did.
Love this video series and your F1 videos. I have a mk1 Golf I’m working on CFD for. Cutting out the bottom rear of the fender flare and curving the wheel well out towards the door edge created additional drag but more extraction from the underfloor. Very similar to the Porsche GT3 RS front fenders. I do wonder about the overall effectiveness of that wedge shaped body kit for aero in general.
Hey Nelson, loved the video as always. Seeing the relatively poor performance of the louvres (in terms of front Cl change) in comparison to other solutions was very interesting to see, though not too surprising considering the disruptions in the flow downstream caused by the other solutions might not be desirable for most cars that might run them. Anyway, you use OpenFOAM for these simulations, correct? Would you mind telling me how you get those "oil flow" surface contours? I've been trying to get them working for months, but I don't even know what to search for when attempting to find the answer on Google, so I'm kinda stuck. Cheers!
yep, it is openfoam the lines are call LIC, line integrated convolution, here is the tutorial I found it in th-cam.com/video/sjTH09Bc53M/w-d-xo.html That section of the car is more complex than I could've imagine. There is a bunch of interaction with the bonnet, quarter panels, wheels, windscreen and mirrors..... Then this also affects the floor because of the engine bay venting......
@@nelsonphillips Oh, I thought it was an OpenFOAM functionObject. That explains a lot haha. Either way, I got it running now. Thanks, this is going to be a huge help in post-processing!
lots of little fins wouldn't work all that well as they would only create small flow structure. A car with the ride height of 10cm you would need a flow structure/vortex with a diameter larger than that. A fin will be proportionally to its flow structure it creates.
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Criminally underrated channel
It’s almost like you’re reading into my mind. Initially My oil cooler setup took air in the cabin ventilation to exit INSIDE the wheel arch which is opened behind the wheel.
THEN:
Thinking the wheel rotating would interfere with the hot air exiting, I decided to channel very carefully the hot air, to a laminar region on top of the rear fender (where you’ve put the little spoiler in your simulation). I’ve haven’t noticed a huge difference, now I know why.
THANK YOU VERY MUCH FOR YOUR VIDEOS.
*on top of the rear of the front fender, if it make sens.
Great video, thanks for sharing your knowledge.
Check out a paper titled "The Effect of Camber and Yaw Angle on the Aerodynamic Performance of Rotating Wheels in Contact with the Ground" 2015. It shows that toeing the wheel in increases the tire squirt vortex inboard of the tire, and diminishes it outboard. When you toe out the wheel the inverse happens. Obviously you can't just run massive toe out, tire wear, tire heating, and stability will all suffer. However what you can do is create outwash inboard of the tires. This will make the relative airflow the tire sees as if it were toed out, without physically having to run massive toe out. This is the logic behind the M4 GT3 race car, the Porsche GT3 RS, F1 cars, LMP cars, etc. What this does is reduce the tire squirt inboard of the tire, so it affects the floor far less.
With one of the early videos with the suzuki a particular configuration of the splitter and the air dam holding it on does something very similar. Everyone runs a round edge/corner, but If you cut out the corner and push the air at the wheel there is such a performance benefit.
This is a great channel! I love that you cite your sources
I'm no areo dynamics expert but as car enthusiast and dodge viper lover , the difference between the ACR hood and gts hood is that the ACR has massive holes (vents) right above the wheels (that cover Approxmeate the length and widths of the wheels) to remove pressure and no elongated wheel archs , just something I understood why it was done more than before thanks for the vid
Maybe adding airflow for brake caliper cooling would change the low pressure behind the wheel. That flow directed up and out by the louvers could help get that air from going underneath the car by a miniscule amount too.
Also, love that book.
super tourers had an interesting solution, venting out from in front of the front wheel. It not in a video, its from a model before I was making videos, when I do the front corner I'll show what they did.
new favorite channel!
Excellent info! thank you for sharing
I don't understand crap, but these vids of you are interesting
Love this video series and your F1 videos. I have a mk1 Golf I’m working on CFD for.
Cutting out the bottom rear of the fender flare and curving the wheel well out towards the door edge created additional drag but more extraction from the underfloor. Very similar to the Porsche GT3 RS front fenders.
I do wonder about the overall effectiveness of that wedge shaped body kit for aero in general.
ah so thats how i came across this video
Hey Nelson, loved the video as always. Seeing the relatively poor performance of the louvres (in terms of front Cl change) in comparison to other solutions was very interesting to see, though not too surprising considering the disruptions in the flow downstream caused by the other solutions might not be desirable for most cars that might run them.
Anyway, you use OpenFOAM for these simulations, correct? Would you mind telling me how you get those "oil flow" surface contours? I've been trying to get them working for months, but I don't even know what to search for when attempting to find the answer on Google, so I'm kinda stuck. Cheers!
yep, it is openfoam the lines are call LIC, line integrated convolution, here is the tutorial I found it in th-cam.com/video/sjTH09Bc53M/w-d-xo.html
That section of the car is more complex than I could've imagine. There is a bunch of interaction with the bonnet, quarter panels, wheels, windscreen and mirrors..... Then this also affects the floor because of the engine bay venting......
@@nelsonphillips Oh, I thought it was an OpenFOAM functionObject. That explains a lot haha. Either way, I got it running now. Thanks, this is going to be a huge help in post-processing!
Where do you do your sims? Ansys?
they are all done in openfoam
Does Australia calls them hoods?
what would be the effect of having lots of very small/low fins on the sides of the car?
lots of little fins wouldn't work all that well as they would only create small flow structure. A car with the ride height of 10cm you would need a flow structure/vortex with a diameter larger than that. A fin will be proportionally to its flow structure it creates.