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January 16, 2014, 12:26 |
Shock wave
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#1 |
New Member
Geth
Join Date: Feb 2011
Posts: 7
Rep Power: 15 |
Is shock wave stationary one? if yes,why it is called as wave?
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January 16, 2014, 13:34 |
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#2 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,833
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not necessarily ... "steady shock wave" is a modelization you can use (a travelling wave at constant velocity is studied as a steady one) but you can have different problems, for example unsteady model provided by the Burgers equation that governs the shock formation or the case of homoentropic flows with compression that tends to form a shock, Riemann problems or other more complex cases...
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January 18, 2014, 12:35 |
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#3 |
Senior Member
Ashwani
Join Date: Sep 2013
Location: Hyderabad
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Shock wave is create when the flow is supersonic. These are governed numerically by hyperbolic equations, which uses characteristic waves to know the solution. Now, I am guessing when these waves corresponding to the particular hyperbolic equations, gives a abrupt change in their values it is called "shock" wave. Please confirm it with the origin of the word.
Also, wiki writes "A shock wave is a type of propagating disturbance. Like an ordinary wave, it carries energy and can propagate through a medium (solid, liquid, gas or plasma) or in some cases in the absence of a material medium, through a field such as the electromagnetic field. " Also, shockwave creates disturbance in the flow-field even if it is a stationery shock. So, it a wave. |
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January 18, 2014, 13:12 |
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#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,833
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unsteady Euler equations are hyperbolics both in subsonic and supersonic regimes ... the classical example of the shock tube can be helpful to understand the meaning of travelling waves
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January 18, 2014, 14:02 |
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#5 | |
Senior Member
Ashwani
Join Date: Sep 2013
Location: Hyderabad
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Quote:
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