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Blast Wave Perturbations

#0222


Studies of Blast Wave Selfsimilar Perturbations.

Tech Area / Field

  • PHY-OTH/Other/Physics

Status
8 Project completed

Registration date
24.07.1994

Completion date
22.02.1999

Senior Project Manager
Nagai H

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Collaborators

  • Graduate Aeronautical Laboratories, USA, CA, Pasadena\nCNRS / Institut de Mécanique des Fluides, France, Lille\nAWE, UK, Aldermaston

Project summary

Theoretical study of self-similar blast wave two-dimensional evolution is suggested. Study of these waves stability problem is suggested too. Small non-radial (two-dimensional) perturbations of these waves are considered assuming their self-similarity. This approach allows to get exact full solution of stability problem for most cases of self-similar blasts. These solutions would be of considerable significance for adequate interpretation of complicated two-dimensional structure of perturbated blast wave both in laboratory physics and in astrophysics. In addition, these self-similar solutions may serve the tests for elaboration of two-dimensional hydrodynamics numerical programs.

Getting solutions of self-similar blast waves stability problem in some cases is planned in scope of this project. Calculation of critical characteristics defining stability of moving system (for example, critical values of adiabatic exponent in case of blast wave in perfect gas) is also planned. The following cases of self-similar blasts are planned to be considered:


- self-similar blast wave in a gas falling onto the center;
- spherical self-similar blast in a spherical gravitational field;
- self-similar blast wave in a gas an adiabatic exponent of the gas being function of it's density.

Also it is planned that the perturbation problem will be solved for some cases where perturbations in self-similar blast wave occur from outer sources (because of presence of small perturbations of initial density; because of presence of small momentum, or small angular momentum etc.) are planned too. Also it is planned to prepare a survey about self-similar blast wave stability.


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