A quantitative study of the interaction of two Richtmyer–Meshkov-unstable gas cylinders
| Autor: | Kathy Prestridge, Robert F. Benjamin, Peter Vorobieff, Mark Marr-Lyon, Paul Rightley, Christopher Tomkins |
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| Rok vydání: | 2003 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Flow visualization Shock (fluid dynamics) Mechanical Engineering Computational Mechanics Mechanics Vorticity Velocimetry Condensed Matter Physics Vortex Physics::Fluid Dynamics symbols.namesake Classical mechanics Particle image velocimetry Mach number Mechanics of Materials symbols Choked flow |
| Zdroj: | Physics of Fluids. 15:986-1004 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/1.1555802 |
| Popis: | We experimentally investigate the evolution and interaction of two Richtmyer–Meshkov-unstable gas cylinders using concentration field visualization and particle image velocimetry. The heavy-gas (SF6) cylinders have an initial spanwise separation of S/D (where D is the cylinder diameter) and are simultaneously impacted by a planar, Mach 1.2 shock. The resulting flow morphologies are highly reproducible and highly sensitive to the initial separation, which is varied from S/D≈1.2 to 2.0. The effects of the cylinder–cylinder interaction are quantified using both visualization and high-resolution velocimetry. Vorticity fields reveal that a principal interaction effect is the weakening of the inner vortices of the system. We observe a nonlinear, threshold-type behavior of inner vortex formation around S/D=1.5. A correlation-based ensemble-averaging procedure extracts the persistent character of the unstable flow structures, and permits decomposition of the concentration fields into mean (deterministic) and fluc... |
| Databáze: | OpenAIRE |
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