CFD simulation of a bullet fired from gun barrel. Bullet motion is computed by integrating the aerodynamic forces. Computation has been done with OpenFoam at GDTech in Belgium.
I had no idea the shock cones were so prominant. Its not unlike the exhaust of a rocket engine or an afterburning jet engine before the bullet leaves the barrel
Bullet will have shock in-front of it. Based on shape of bullet bow shock or oblique shock. Shocks are sharp discontinuities. I think this is not modeled in the simulation
This simulation is incorrect. During the pressure field example we can clearly see the round just barely exceeding the speed of sound. However the pressure wave from the gas escaping the barrel is still clearly outrunning the round.
this isn't taking the barrel crown into consideration? the profile of the barrel muzzle is very important for accuracy, why you should not shove a cleaning rod down a barrel from the muzzle end if you ask 5 different gunsmiths about crown profile, you'll get 10 different answers!
Wow, so the bullets slows down right at the edge of a muzzle only to speed up again when it leaves it? Is it a glitch or is that really the physics of it?
It makes sense. As the bullet travels through the barrel I imagine theres a vacuum effect pulling it back that would get stronger the further down the barrel it travels.
@@mrstrawhat9227 Did not think of the vacuum, makes sense. But why it speeds up again? Does it get eventually pushed by air rushing in to fill the vacuum creating a shockwave when it fills up the muzzle?
One tip: provide scale if possible. Velocity, pressure and temperature are all great, but the viewer doesn't know to what extent
Good to see you back in action. Lovely bullet simulation
Whaou ! The shock waves are impressive !
0:19 female reproductive system
0:28 male reproductive system
Tf
O bhaiii maro mujhe maro 😂
exactly what i thought
Hahaha
When I fire a gun I will unintentionally laugh because of you. People will think that I'm a psychopath.
I had no idea the shock cones were so prominant. Its not unlike the exhaust of a rocket engine or an afterburning jet engine before the bullet leaves the barrel
What if the bullet is super sonic?
Well, modern APDSFS shells go around 1700meters per second, i think they breake the sound barrier pretty easily
Same thing but slightly faster and also a big boom
Bullet will have shock in-front of it. Based on shape of bullet bow shock or oblique shock. Shocks are sharp discontinuities. I think this is not modeled in the simulation
Bullet go brrrrr
I guess then you'll see a considerable shockwave
Great simulation, what kind of model are you using for the gun powder?
It looks like boom pow powder but that’s just at a glance
Beautiful Simulation
Damn, that is a lot cooler than I realized it could be
Biology Students watching this be like
😏hmmm interesting way of representing our reproductive system.
Xd
you son of a gun
which solver has been used? also which meshing technique is deployed in this simulation?
OpenFOAM is the free, open source CFD software developed primarily by OpenCFD Ltd since 2004
different muzzle attachments would be awesome to see
Is that subsonic?
yes it is
can you give a tutorial on bullet motion inside a tube
That's pretty neat.
so the question is, why is there a temperature inversion after the bullet leaves the barrel at the opening?
pv=nrt may be?
is it sonicFoam used? openfoam 8 does not come with sonicFoam anymore...
"welcome to mcdonalds, can I take your ord..."
This simulation is incorrect.
During the pressure field example we can clearly see the round just barely exceeding the speed of sound. However the pressure wave from the gas escaping the barrel is still clearly outrunning the round.
Awesome and beautifull to watch, except the slowdown of time when bullet exits barrel. It breaks fluidity and sense of time.
The simulations look good! However it will be good if you provide some scales !
How did I get here ?
i need to learn how to perform this type of simulation
could you teach me how to do it
which software is this
OpenFOAM, apparently.
No wonder I love guns so much
this isn't taking the barrel crown into consideration?
the profile of the barrel muzzle is very important for accuracy, why you should not shove a cleaning rod down a barrel from the muzzle end
if you ask 5 different gunsmiths about crown profile, you'll get 10 different answers!
This sure is interesting, it’d be a shame if popular Lynyrd Skynyrd song “Free Bird” were played over it.
Wow, so the bullets slows down right at the edge of a muzzle only to speed up again when it leaves it? Is it a glitch or is that really the physics of it?
It makes sense. As the bullet travels through the barrel I imagine theres a vacuum effect pulling it back that would get stronger the further down the barrel it travels.
@@mrstrawhat9227 Did not think of the vacuum, makes sense. But why it speeds up again? Does it get eventually pushed by air rushing in to fill the vacuum creating a shockwave when it fills up the muzzle?
@@Puleczech maybe?
it probably is just lagging since the time at the bottom isn't increasing at a constant speed
@@AkariInsko I thought that too, but that would be quite a blunder for such a video...?
Why is the bullet momentarily slowing down during it's exit from the barrel? This is not accurate if that is anymore than lag in the program
The timestep isn't constant. You may observe the velocity graph in the top left corner to see actual velocity.
1:23
Fractal structure?
Did you use adaptive mesh refinement?
mississippi queen
This is crazy
Why no shockwave?
عاشت ايدج ضلعه♥🌷
They all look like subsonic rounds
Спасибо ютьюбу за рекомендацию)
There must be [s], not [ms] on the graph
How about speed of light.
Wow, I need a tutorial on this sim!!
What Bullet temperature not goes up before friction with air ?
it's really beautiful.do u have tutorial for this?
4 years of computer science and math
Would be interesting to see a rifle version of this.
Why are they all squids
Looks like camo kidney
Sorry bro but will use some screenshots for my Instagram post, I will give credit to you.
no
@@lucasvera253 why?
PENG!!
Sweet, now I can make a better gun
Ok
666 likes
Useless. Without an actual velocity and temperature this simulation is wasted compute. Why do simulation folks live in the nondementional world?
for somone who dont know why theres air coming out of the barrel before the projectile leaves the barrel
That’s because the barrel is rifled.
Lmao
Is that supposed to be a joke?
1:27 looks like a bird or an eagle. god and life emanate from every part of reality.