if the width and length have to be equal is a ball the most aerodynamic object?
>>8181700
my bad
By what criterion? If I had a ball of putty, I would fashion it into a very thin cylinder to reduce cross sectional area and I'm pretty sure I'd do better than a ball.
>>8181697
A flat square.
You never said anything about height :^)
>>8181724
oh shit sorry.
>>8181739
oh yeah i meant circumference. i guess correct criteria for this kinda stuff is volume and length so lets just say that length is 1 and volume is 0.52
>>8181744
how about this?
>>8181750
>>/gd/
also no a ball is not the most aerodynamic
a thin sheet is
>>8181753
What about rotations?
>>8181754
how about now?
>>8181815
>>>/politically correct/
Fuck I love this thread
>>8181848
i'm glad that there is atleast some enjoyment to be had from this thread
now, another question:
which of the shapes has less drag and why, or are they equal in drag?
Wow fag real funny, see you on r/4chan xDDDD
>>8181866
>left to right
fuckckck
There is software for this. Look up the lattice boltzmann model. It's slow but parallelizable. You can put whatever shape you want and qualitatively (or quantitatively with more work) answer this question through simulations.
>>8181886
why does the top one have less drag?
also, what is the most aerodynamic shape then considering the criteria being that it's length is 1 and volume is 0.52
>>8181819
that would be /lit/
>>8181896
> why does the top one have less drag?
the top one has a more gradual area that air has to deal with, and the effects of the sudden end of the airfoil are less than the drag effect of the flat surface facing the airflow
> also, what is the most aerodynamic shape then considering the criteria being that it's length is 1 and volume is 0.52
I think a symmetrical airfoil.
Things to think about:
1. Different domains of airspeed lead to different drag conditions (Stoke's drag, Newton's drag, transonic flow, and supersonic flow), with all sorts of different forces dominating the physics of what's going on
2. There's lots of different tricks that are used to fight drag, including the dimples on golf balls and Kline-Fogleman foils (which I just learned about)
https://en.wikipedia.org/wiki/Kline%E2%80%93Fogleman_airfoil
https://en.wikipedia.org/wiki/Drag_(physics)
what about this, the points distribute pressure more evenly, the hairs on the tail prevent a vortex from forming
>>8182008
pretty sure those create more vortexes
>>8181973
sears haack body is the least amount of drag an object of certain volume and length can have but with 1 length and 0.52 volume would it just end up looking like a sphere? i wonder if there is some kind of simulator for drawing sears haack bodies where you can input volume and length
Wouldn't a square, but dropped diagonally, be more aerodynamic than a sphere?
>>8182008
i was thinking this as well, i don't know about those hairs though.
if this shape would indeed have the least drag shouldn't the sears haack body have some resemblance? with those extra curves on the tips i mean.
>>8182020
*cube i meant
>>8182018
>i'm a mathematician with a strong background in physics, this should be a piece of cake
>look up supersonic aerodynamics
guys help i'm having a crisis here what the fuck is this shit
>>8181750
>>>/fr/
>>8182013
that's not what arrows say
>>8181896
>why does the top one have less drag?
skin drag is less significant than form drag
>>8182038
Fluid dynamics is the devil
>>8181747
>length 1
>volume 0.52
that's not a sphere
>>8181875
Why the fuck would you suggest LBM for this. Literally any FEM solver will be more available, easier to use, faster and more accurate than LBM for this sort of thing
>>8181753
Raindrop is most aerodynamic shape
>>8183056
at first one might think that it is a picture drawn with a compass but actually it is calculated mathematically, interesting stuff
