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Revision as of 16:16, 31 January 2007
Moving 'Shock' is situation where the shock is moving and do not stay in one location sometime people refers to it as shock dynamics. In many physical situations the shock is moving variable speed. However, in many situations this variable speed can be considered as a constant velocity to which many analytical tools can be applied. In this case, the moving shock can be transformed to a ``stationary normal shock" by attaching the coordinates to the shock. There are two broad categories of this shock one reffered to as "open valve" and "close valve". The open valve referred to situations when high speed gas run into slower moving gas. In the extreme case this open valve case is of high speed gas running into a still medium. The ``close valve referred to the case where shock is generated as a results of the shock reflecting from a solid (relatively hard material) and the shock is propagating upstream. Normally, when the two sides of the shock are moving the word ``partially is also applied.
The governing equations of the shock wave were well established well before World War Two. Yet, many cases no analytical solution was given. Recently, Bar-Meir has derived solutions to many of the cases. For example, the shock speed as results of piston movement became simple analytical solution. These solutions show that for example when one open the valve in his garden and the pipe is empty flow initially contains a moving shock that creates extremely large temperature increase to a few milliseconds. The phenomenon of the moving shock has many industrial applications.