Numerical study of interface dynamics and material transport on shock-accelerated heavy gas cylinders

Release time:2025-11-06  Hits:

• DOI number:10.1063/5.0270282
• Affiliation of Author(s):哈尔滨工程大学
• Journal:PHYSICS OF FLUID
• Place of Publication:美国
• Abstract:A numerical investigation is conducted to characterize the interaction dynamics between planar incident shock waves (Mach numbers ranging from 1.21 to 2.00) and a cylindrical SF6 heavy gas column embedded in ambient air, focusing on Richtmyer-Meshkov instability (RMI) development, interfacial scale evolution, and vorticity-driven material transport mechanisms. From an Eulerian perspective, the motion of several interface characteristic points, the evolution of material line length, and two area parameters associated with SF6 distribution are tracked. Additionally, the SF6 material transport process and trajectories of material points within the gas column are visualized using the Lagrangian particle tracing method. Theoretical models for bubble velocity, vortex core spacing, and material line stretching laws are evaluated. Our results highlight the significant influence of incident shock strength on interface evolution and material transport. The streamwise motion of both the gas column and primary vortex core follows near-linear trajectories, whereas spanwise dynamics exhibit nonlinear behavior driven by hydrodynamic instabilities. The SF6-containing region expands linearly due to the growth of the primary vortex pair. Two constants-vortex core spacing and SF6 volume fraction weighted area-are identified, both dependent on the incident shock strength. Material line length evolution follows a two-stage exponential growth pattern, sequentially driven by RMI and secondary instabilities. Lagrangian analysis reveals a stratified entrainment mechanism, with outer SF6 layers mixing earlier than inner regions. Theoretical models show strong agreement with numerical predictions for bubble velocity and SF6 volume-fraction-weighted area, while discrepancies are observed in vortex core spacing models.
• Indexed by:Journal paper
• Discipline:Engineering
• Document Type:J
• Volume:37
• Issue:6
• Translation or Not:no
• Date of Publication:2025
• Included Journals:SCI