physics of explosions (simplified)

Started by RemiD, November 27, 2024, 11:33:19

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Baggey

#15
I am so Rusty right now with all this :( . If i remember The energy of the explosion is Potential energy. Waiting to happen. When triggered it becomes Kinetic. It has some Force newtons laws!

So, there is Acceleration due to the The Force. Gravity has an effect on it and so does the Medium it travels through. I think that was what @Derron was saying?

So when explosion is started it will move slowly in the medium building acceleration due to the FORCE of the explosion. And will reach a peak where it starts to slow down and fade out. Sin would do this. But there is a variable called 'Mue' This effects how the wave of the explosion is travelling through SPACE! ie, Mue is the friction caused which will slow it down when it gets passed the Equlibrium point. ::)

Newton goes through all this :-X

If what i have said makes no sense then ignore it! Just trying to help ;)
Running a PC that just Aint fast enough!? i7 4Ghz Quad core 32GB ram  2x1TB SSD and NVIDIA Quadro K1200 on Acer 24" . DID Technology stop! Or have we been assimulated!

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Derron

Are you sure it builds acceleration due to the force?
(I mean yes, for the moment of the explosion (it "takes a veery small fraction of a second" I guess) it adds to the acceleration - similar to something "pushing and pushing and pushing" you.

The "slowdown" is simply because of the energy being "eaten" by the elements it has to travel through. Energy conservation law.

A "Peak" as you describe is more to see in a thrown ball ... you give it an upwards directed eKin and then gravity eats from it until eKin is 0. Gravity is kinda ePot ... but directed to earth (in our case). So what you loose in eKin is what you gain in ePot (almost). And then once no eKin is left ("peak"). From now on gravity can eat from ePot until some other force wins (eg object crashed into the ground) :)


bye
Ron

col

The SUVAT equations spring to mind from my days at school :-X . Nice and easy to implement, and a good approximation for simulating dynamic motion.
https://github.com/davecamp

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DaiHard

@Derron, it's not quite instantaneous: typically the chemical reaction of the explosion will result in the production of a lot of gas, which then has a high pressure which spreads out, generating the blast wave. The reaction is very fast (your "veery small fraction of a second" !), so can probably be considered instantaneous, but the expansion of the gas will take a while (but still be fast) - then it will result in a compression wave (the blast effect) radiating out. How this spreads depends on the environment: in the open air it will expand as the surface of a sphere (hence the inverse square law I mentioned earlier: the energy spreads over a surface area). In a gun barrel, for example, it is trapped, and expansion depends on accelerating the bullet, so it will take a detectable time.