All Questions
Tagged with shockwave or shock-waves
241 questions
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Is the Mach cone the model of a shockwave?
I am in the process of writing a mathematics paper which aims to model the interaction of a supersonic (or transonic for that matter) object with a flat plane. I need to determine the shape that a ...
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Interaction of Supersonic and Hypersonic Objects
Lets imagine you are chilling in a plane cruising at some Mach 1 or Mach 2. Behind you, parallel with your direction a Mach 11 missile passes you by. What would you experience? Would you experience ...
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Explosions in high viscosity liquids
I was watching The Score (2001) in which De Niro manages to make a hole in a cobalt and titanium infused steel safe. he fills it with water. inserts an explosive and boom! the safe is open.
It made me ...
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What exactly is a Normal shock in a CD Nozzle?
This might sound like a simple straight forward question but it is bothering me for hours now. What exactly is a normal shock in a CD Nozzle?? From various resources I came to know that a normal shock ...
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Busemann biplane wave drag
The Busemann Biplane consists of two diamond shapes that cancel each-others shockwaves. Which means that it generates no sonic boom or wave drag.
It can be modified to generate lift with a slight ...
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Since waves are abstractions, does it even make sense to ask whether light is a wave? [closed]
All waves transmit energy.
Water Waves
Let's say you're in the middle of a calm pond and you start moving your hand up and down. Transverse "waves" are generated, and they propagate ...
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How do shock waves reflect?
As seen in this picture, an oblique shock was reflected off of a solid wall. I understand that the flow has to turn to continue the shock, but how does this work when it gets to a wall?
What happens ...
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Can supersonic flow be achieved without converging diverging nozzle?
Can supersonic flow be achieved without the presence of a converging diverging nozzle if sufficient pressure difference is available?
https://www.tomshardware.com/desktops/pc-building/an-ordinary-...
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Deflecting a lunar mass with consecutive nuclear explosions [closed]
I'm looking for help in determining the amount of deflection an object with a mass of roughly $7\times10^{22} \,\text{kg}$ (a lunar mass) needs from colliding with a planet. Let's stipulate that the ...
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Burgers' equations and shock waves
Given Burgers' equation, $m_{\tau} + mm_x = 0,$ one expects to have discontinuities and thus shock waves in the case the initial conditions are smooth. For example, one may take $m_0(x) = \sin(x), x\...
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Burger equation and shock waves
Given the burger equation, $$m_{\tau} + mm_x = 0,$$ one expects to have discontinuities and thus shock waves in the case the initial conditions are smooth. For example, one may take $$m_0(x) = \sin(x),...
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Does a rubber mat reduce the impact to the floor below?
My lack of physics knowledge is preventing me from solving an everyday life problem. Please bear with me!
Say I have a second-floor apartment and I want to do deadlifts. I am afraid of the floor ...
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What is the entity that resides at a point with a radial coordinate $r$?
In his groundbreaking paper The formation of a blast wave by a very intense explosion I. Theoretical discussion, G.I.Taylor presented a number of equations, including the ones depicted below:
In ...
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How did G. I. Taylor derive the PDE's in his landmark 1941 paper?
To gain a deeper understanding of the derivation of G. I. Taylor's foundational equation $R= S(γ)t^\frac{2} {5} E^\frac{1}{5} ρ_0^\frac{-1}{5} $, I'd be grateful if you could point me towards the ...
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Why do shockwaves refract when they travel into the ground?
If a shockwave from something like an explosion travels into the ground, why will it refract? The speed of sound is far different in the ground, but what would make it refract? I can’t seem to find ...
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How are shockwaves able to refract?
How are shockwaves able to refract? As said here,
When two shock waves collide, they interact with each other and produce complex patterns of compression, rarefaction, and reflection. The resulting ...
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How do shockwaves interact?
As seen here, there are two T-38's going supersonic. What happens when those shockwaves interact? They seem to dissipate in some places on this photo when they interact. Any source online says that ...
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Does every shockwave have an expansion wave behind it?
Do all shockwaves have an expansion fan or expansion wave behind them? Does the air always expand behind a shockwave?
I assume that the strength of the expansion wave depends on the strength of the ...
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How is the second shock in a lambda shock able to form?
For an oblique shock to form, there has to be an angle in which the flow turns into itself. Usually, that angle is caused by flow separation, in which the separation is caused by a normal shock first, ...
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Sonic boom on atomic particles
we know that something travelling faster than the speed of sound creates a continuous sonic boom because the air cant get of its way fast enough but if we consider smaller particles which can travel ...
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Where are the results of the smoke mortar measurements of the shock wave in nuclear tests?
Smoke mortars were used in nuclear tests to measure the passage of the shock wave.
The passage of the shock wave could be detected by the sunlight reflected from the smoke trails being refracted ...
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Intuition behind retarded/causal Green's function for the 1+1D wave equation
I see that the retarded/causal Green's function for the 1+1D wave equation is
$$ G(x, t \,|\, x_{0}=0, t_{0}=0) = \frac{1}{2c} H(t - |x/c|), $$
(where $H$ is the Heaviside step function) which ...
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Photons and gravitational wave
Both photons and gravitational disturbances travel at $c$. Given that a photon does cause a tiny stress in spacetime due to its energy, and the propagation of this stress is at the same velocity as ...
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Does anyone know of published data on Mach interactions with various asymmetrical toroids?
I was looking for any lab conducted tests, or computer models of Mach reflections off of different toroids. How would shock waves propagate through asymmetrical 180° ring toroids, what kind of ...
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What happens when the shockwave is opposing the flow direction
There is a supersonic flow over a flat plate (assume inviscid--no boundary layer). Suddenly, there is a point blast occurring on the flat plate, generating a semi-spherical shock wave. For the ...
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Theta-Beta-Mach relation for small deflections
I'm currently studying shockwaves, particularly their effects on drag.
I've stumbled upon an odd formula in "Elements of Gasdynamics" (Liepman and Roshko, pages 52-53), in there I saw an ...
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Why is there sound aboard Concorde after it goes supersonic?
I recently saw a video from a passenger of Concorde after it goes supersonic. Inside the aircraft, there is still a loud roar similar to what we hear in aircraft today.
However, since the aircraft is ...
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Shock wave’s energy transfer between different mediums
This topic fascinates me, but my knowledge about shock waves — the physics behind them and the way they conduct energy — is very limited.
I wanted to ask then for some elucidations, about what happens ...
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Hyper-saturated blue colour in underwater explosions?
I've been looking at underwater explosions from various US navy shock trials:
e.g. https://www.youtube.com/watch?v=yV0eyP4nO20
and https://www.youtube.com/watch?v=PS2whGDzmzg
If you go frame by frame ...
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Volume Conservation in Shock Plastic Waves [closed]
SOLIDS: Plastic deformation is known to have constant volume. During shock, does the plastic wave not compress the volume? Should the only compression come from the elastic wave?
Edit-1: screenshot
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In nuclear weapons, why does levitating a pit improve compression?
Levitated pits were introduced after after solid pits. In this design the tamper is separated from the fissile with an airgap. From the Nuclear Weapon Archive:
The original Fat Man pit design used a ...
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Are there shock waves outside of fluid dynamics?
In general, conservation laws can result in shock waves, i.e. locations where a variable changes quickly and a discontinuity arises. One of the most common examples that is always mentioned is the ...
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Derivation of the Mach number of the reflected shock in shock tube
I am a new learner in compressible aerodynamics. When studying the shock tube, I struggle to derive the relationship between $M_{s}$ and $M_{R}$ after the shock is reflected from the end wall. How ...
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A shock propagates in to stationary air at $M$. Find the speed of the air (fixed frame reference) after the shock has passed
The speed of sound prior to completion of the shock is $M_1 * a$, where a is the speed of sound at that point.
The solution is then that the speed of the air after the shock has propagated is $(M_1 * ...
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Laser induced explosion (detonation)
I have a question involving quite the wacky (and silly) hypothetical. It's a part of an ongoing argument I'd like to settle. Of course, I have no background in physics which is why I came here, so I ...
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What is a relatively simple/heuristic formula to find the yield of an explosive given the peak overpressure and the mass of the charge? [closed]
Suppose one can experimentally determine the two parameters mentioned in the question, are they enough for a good approximation of the yield of the explosive? I am thinking there are some ways to do ...
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Propagating of shock waves in an ideal gas
I am studying gas dynamics and I want to numerically calculate the propagation of a shock wave in an ideal gas.
The problem statement is something like this:
The ideal gas is located in the region $-\...
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Shock when a supernova explodes
I have been reading that when supernovae explode, they produce (Shockwaves) which act as cosmic accelerators.
I do not understand, what is meant with "shock" (partially because I do not ...
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Dynamic equations for a gas discharge lamp
This question asks why a gas discharge lamp is blinking and making a noise when it is turned on. I think that the lamp (with potential on) is a bi-stable system where the current-carrying "bright&...
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How does transition from supersonic to subsonic flow occur?
I was working with orifices that were restricting flow and had to do a few calculation to verify some measurments (and to see if stuff was within tolerances).
So I stumbled upon the calculations our ...
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How much do tunnels extend blast waves from explosives?
As was discussed in the comments, I've crossposted this question to here, and am cross-linking them: https://worldbuilding.stackexchange.com/questions/234669/how-much-do-tunnels-extend-blast-waves-...
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With blast injuries, how much of the damage is from rapid decompression? [closed]
If a person or creature suffers a high explosive or low explosive blast, how much of their injuries will be due to the sudden decompression immediately after the shockwave?
Sudden decompression can ...
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Rarefaction Shocks, Bethe-Zel'dovich-Thompson (BZT) Fluids
In his 1988 book Compressible Fluid Dynamics, Philip Thompson (Ransselaer Polytechnic) defines the fundamental gas dynamics derivative, viz.
$$\Gamma = \frac {c^4}{2v^3} \left(\frac{\partial^2v}{\...
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Do chemical reactions occur inside of the Shock wave?
I am currently reading Anderson's book on hypersonic aerodynamics. In the energy Navier-Stokes equations its is very common to ignore Dufour effect, which is (as I understand) non-negligible when huge ...
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Can elastic mediums snap at a faster speed than the wave which travels in it?
The speed of wave in an elastic medium is given by
Velocity of Longitudinal Wave
1) Velocity of Sound in any Elastic Medium: It is given by $v=\sqrt{\frac{E}{\rho}}=\sqrt{\frac{Elasticity\,of\,the\,...
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Can the dynamic between high speed sound media and slow one preduce shock wave?
Suppose there is two long media that in one of them the speed of sound is high and in one of them is slow.
Would the vibration in the one with the higher speed of sound would cause shock wave in the ...
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Clapping-like sound from large planar object hitting a surface
I am trying to understand the behavior of air when a large, planar object hits a parallel surface at a high velocity, thus forcing the initially static air outwards, and creating a sound wave. This is ...
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Utility of Burger's equation in the study of shock waves
Consider the viscous Burger's equation,
$$
\frac{\partial u}{\partial t}+u \frac{\partial u}{\partial x}-\nu \frac{\partial^{2} u}{\partial x^{2}}=0, \tag{1}
$$
with $\nu>0$ the kinematic viscosity....
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Are seismic waves and shock waves same?
Are shock waves (those produced by high speed jets) and seismic waves (produced during earthquake) the same?
In many places I have seen seismic waves referred to as shock waves. So are these two same?
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How would high-explosives interact with the shockwaves around a hypersonic weapon?
This is a proxy for a question from a friend. I'm an aerospace engineer so I have some domain-knowledge on compressible flow but less about missile design and even less about explosives. I also ...
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