Bulletin of the American Physical Society
21st Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 64, Number 8
Sunday–Friday, June 16–21, 2019; Portland, Oregon
Session Z5: TMS: Simulation of Porous and Granular Materials |
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Chair: Travis Sjostrom, LANL Room: Galleria North |
Friday, June 21, 2019 11:00AM - 11:15AM |
Z5.00001: Validation of High-Resolution Calculations to Inform Continuum Model Development Garry Maskaly Accurately modeling shock loading of composite materials presents challenges for continuum (accurate modeling shock time and breakout velocity). In this work, we develop high-resolution models capable of capturing salient details of the material, which are then validated against experimental results. In addition, these high-resolution models are then used to validate and improve a series of continuum models (P-alpha to treat porosity). This work will focus on studying polymer foams across a series of densities where large volume collapses occur upon shock loading. These models resolve the porosity, which is not possible in large-scale continuum calculations. The approach of validating high-resolution models to aid in the development of continuum models is unusual. Validation is usually performed on the continuum level with perhaps high-resolution calculations informing additional model development. While this approach is not ideal for all applications, this work will discuss a series of applications where such approaches have large benefits. [Preview Abstract] |
Friday, June 21, 2019 11:15AM - 11:30AM |
Z5.00002: Mesoscale simulations of shock-induced melting in aluminum powder Brian Demaske, Matthew Hudspeth, Anirban Mandal, Brian Jensen, Tracy Vogler Mesoscale simulations of an impactor colliding with a PMMA capsule containing aluminum powder ($\rho_{00}$ = 1.5 g/cc) have been performed to investigate shock-induced melting in porous metals. Impact velocities of 1-2.5 km/s are chosen to coincide with in situ X-ray diffraction experiments, which provide direct evidence of time-dependent melting behavior in the aluminum powder. Mesoscale simulations show shock heating within the powder is highly nonuniform and melting remains incomplete for even the highest impact velocities. Such incomplete melting behavior was also observed in experiments despite continuum equation of state calculations predicting equilibrium pressure-temperature states well in excess of the experimental melt line. Inclusion of explicit heat conduction within the model leads to a reduction in the high-temperature tail of the temperature distribution within the powder and a shift in the main peak towards higher temperatures. At low impact velocities, a decrease in the powder melt fraction is observed relative to the non-conductive case, whereas, at high impact velocities, an increase in the melt fraction is observed. [Preview Abstract] |
Friday, June 21, 2019 11:30AM - 11:45AM |
Z5.00003: Particle resolved simulations a of shock passing through a bed of spherical particles Yash Mehta, Thomas L. Jackson, Sivaramakrishnan Balachandar, Jonathan Regele The study of shock-particle interaction has been largely motivated because of its extensive applications. The complex interaction between the compressible flow features, such as the shock wave, the contact discontinuity, the expansion fan, and the dispersed phase makes this multi-phase flow very difficult to predict and control. In this talk, we will be presenting results on particle-resolved inviscid simulations of a shock interaction with a random bed of particles. A detailed analysis of the inviscid forces experienced by the particles will be discussed and the effect of particle volume fraction and strength of the incident will be investigated. One of the interesting observation from the simulation results is the flow field fluctuations that arise due to the presence of randomly distributed particles. We compute the magnitude of the RMS velocity and the pseudo turbulent Reynolds stress to understand the importance of the flow field fluctuations. [Preview Abstract] |
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