Numerical Investigations in the Propagations and Interactions of Blast Waves
| Autor: | Shi-Wei Lo, 羅四維 |
|---|---|
| Rok vydání: | 2006 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 94 The physical phenomena associated with blast waves have been studied for more than half a century. The complex shock-shock and shock-vortex interaction phenomena which take place following the detonation of an explosive device include reflection, diffusion and consolidation events. Following the excessive threats posed by high explosive devices, the explosive effect of blast wave employed not only in the battlefield, but also as a threatening force by the terrorists. The blast wave causes serious damages in events such as the vehicle bombing, hotel explosion, and the detonation of fuel gas in industry. Researchers have utilized both experimental and numerical approaches in attempts to clarify the physics of the blast phenomena and in development of techniques to predict the likely effects of blast waves. This thesis presents the investigations of the behaviors of blast waves by employing the finite volume method and by solving the associated time-dependent, compressible flow. The complex transitional shock phenomena are studied by means of a multi-block mesh system and a flux computational model. The Total Variation Diminishing (TVD) upwind method is applied. Spatial discretization is performed using the Roe’s solver with high-order Kappa Monotone Upwind-centered Schemes for Conservation Laws (MUSCL) interpolation. Time integration is achieved via the second-order explicit Hancock method. To attain the goals of developing and applying a numerical code to predict the behaviors of blast waves, validation and fundamental studies in interaction, propagation and reflection of blast waves are done. Meanwhile, the analytical results obtained from simulating the three-dimensional and dynamic meshing system cases are also discussed. In summary, the objectives of preliminary research on the study of phenomena related to blast waves have been satisfied in this thesis. Furthermore, the computational scheme needs to be improved to overcome the calculating problems associated with the moving solid body for which no space between solid bodies is assumed. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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