### blastwave

(spherical shock wave from a small volume)

A **blastwave** (or **blast wave**) can be thought of as a shock wave
(faster-than-sound) expanding (spherically, if allowed to) from a
small volume. A mathematical model developed by several physicists,
including Leonid Sedov and Geoffrey Taylor, describes what is termed
**Sedov-Taylor expansion** (or **Sedov expansion**),
presuming expansion is an adiabatic process,
i.e., for a phase somewhat after the blast
the amount of energy in the volume behind the shock
front is basically unchanging.
The model is useful for powerful explosions (including nuclear
explosions) and in astrophysics, supernovae and modeling
supernova remnants. **Sedov length** is an astrophysical
term for the distance from the initial blast at which the phase of
Sedov expansion begins.

(*physics,wave,fluid dynamics,shock*)
**Further reading:**

http://en.wikipedia.org/wiki/Blast_wave

**Referenced by pages:**

supernova remnant (SNR)

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