Sorry if I put anyone off. I know I do get a little/lot preachy. Just be glad you aren't one of my kids!Twaddle wrote:I'm going to have to agree that it seems more likely for the top slot to be a vent than a dam.Adrian Newby wrote:I'm sure all of the designers are far too clever to agree with me.
It's all a matter of trade-offs, so what are you willing to give up to get a little less drag on the nose of your car?
All air is critical, but some is far more critical than others.
The fences only extend as far as the hump, at which point an air dam is going to spill off to the sides as it builds forward (a goodly portion of the oncoming air running into the air dam would have already spilled off to the sides). And if that is as large as your air dam is going to be, I don't see the point, especially for the cost to the flow on the sides. I believe the fences are there to keep the air that is going up the ramp from being pushed over the sides.
Continue to differ with me all you like. It will put you in far better company!
You have a rule that would generally lead to a stepped nose if you want to maximise the underbody airflow. Other than being ugly, one of the main disadvantages of the step would be air spilling around the sides causing disruption in an area where you gain considerable benefit from keeping the flow as clean as possible.
Inserting a vent into the area where the step would be reduces this disruption while also scavenging some additional cooling air at virtually no cost; win/win. (Obviously we can't tell if they've managed to duct some of this air to provide additinoal KERS cooling, or if it's just servicing the driver and electronics.)
If you have an air dam that creates a large enough effect to be significantly better in terms of aero efficiency than a simple step, for air flowing over the nose, I don't see how it could do anything other than create increased "side-spill"; win/lose. I know which one sounds like the better option to me.
It would be good if someone could run some CFD with a detailed reproduction of the RB front end modelled as both a dam and a vent at some point to see how things look. Either way it looks like those side slop "fences" would be important in keeping the flow clean on either side. Apologies if n_smikle's work included these(I can't see it for some reason), but it sounds like it didn't from the discussion.
Adrian, I'm going to go out on a limb and suggest that some people are being put off reading your posts as clearly as they might due to the agressive tone you seem to favour. Combined with your earlier post mentioning "equal transit time" in relation to Bernoulli's principle (which was never going to do your credibility any favours) it's not going to lend much weight to your ideas. I know it doesn't help me to read your posts objectively when you're basically coming across more like you're preaching than raising points for discussion.
You're probably not going to like this next bit any better...
I am so freaking tired of Bernoulli. I tried to explain a simple lift concept to someone who sounded like they had never heard of such a thing before, and immediately got jumped on (and still do, daily) for bringing up Bernoulli.
Sorry, but Bernoulli's principle is a part of science history. Sure there have been better explanations since then, but there have been in every field. Long-winded explanations are beside, and beyond, the point at hand. I explained Bernoulli's principle in the most simplistic way possible on purpose, not because I don't know more advanced and modern thought on the subject. Do you tell a small child he needs to create a certain slip angle when he is wanting to turn his tricycle? I'm not saying people on this board are children, but what I am saying is that there is no need to go that far in depth about the thing you need someone to know, for them to have a basic idea about it, so you can get on with it and make your actual point about something else.
In any case, people got far to upset far too fast, so I get the distinct impression that this whole Bernoulli fracas has more to do with other people and some long-running fight they were having with someone else. So, at the expense of derailing the thread, they jumped out there and started their fight up again, thinking they would use me as their whipping boy for their "cause".
But "That ain't me, Babe", as Dylan would say...