Vanja #66 wrote: ↑21 Mar 2023, 21:32
In these 2 simulations (yaw 0 deg):
AMR23-sidepod-model:
Downforce
4663N
Drag
2349N
W14-sidepod-model:
Downforce
5270N
Drag
2371N
How come more drag on W14? Front wing is bigger on W14 model and more loaded in centre, I had some trouble with waterslide separation deep down, so I unloaded central section on AMR completely (more than the actual car I believe). This is the entire reason for those overall differences, rear tyre drag values are very close (922N and 911N respectively) - because rear tyre squirt behaved differently on W14 and dropped the pressure on the rear more, generating more drag. I wouldn't presume pointing to such important features from these simulations and say they have some meaning, tyre squirt is far more complex than front tyre surface pressure field.
And this is exactly why I didn't want to post absolute numbers a year ago - models are very, very limited and we can only use them to observe possible behaviour around sidepods and draw some limited conclusions from potential phenomena occurring there.
Thank you for the numbers sir.
I feel more connected to the simulations now, more than Hamilton is to the W14.
I see why you did not want to post the numbers, so as not to mislead, but it still provides a deeper perspective on what was done and what had to be adjusted. The numbers can drive bias, or remove bias, depending on intentions. if you don't see what you like you can tweak a wing or tuck in a sidepod belly to tweak the results to how you want it, or.. the numbers can indicate a missed detail, and upon correction you end up with a more accurate model which is the right thing to do. But for me at least, I get a feel of the challenges you experienced with the modeling, given that we cannot expect you to have 100% precision with wing profiles, tyre squirt etcetera.
The Lift to drag is too good for W14, and this is maybe why Mike Elliot is scratching his head. Probably got similar results.
Or it can be correct, but that value only exists in an instant in reality and 90% the rest of the time the attitude of the car is not ideal and it's making less than the AMR23.