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The study of Z-pinches with engineered defects
News Article, October 13, 2022 • 3D-magnetohydrodynamic simulations of electrothermal instability growth by studying Z-pinches with engineered defects Electrothermal instability (ETI) is driven by Joule heating and arises from the dependence of resistivity on temperature. When a metal is Joule-heated through the boiling point, ETI drives azimuthally correlated surface density variations or “strata,” which provide the dominant seed...
3D-magnetohydrodynamic simulations of electrothermal instability growth by studying Z-pinches with engineered defects

Transformational capabilities demonstrated by Sandia at AI Expo
News Article, June 17, 2024 • Danny Gomez from Sandia watches as Senator Martin Heinrich experiences the immersive extended reality environment of JARVIS. (Photo courtesy of John Feddema) Ten national laboratories, including Sandia, shared one of the largest booths at the AI Expo for National Competitiveness from May 7-8 in Washington, D.C. The new conference provided...

Understanding the effects of radiation on reconfigurable phase change materials
News Article, June 22, 2023 • David Adams was elected Fellow and President of American Vacuum Society: Science and Technology of Materials, Interfaces and Processing in 2023. Chalcogenide thin films that undergo reversible phase changes show promise for next-generation nanophotonics, metasurfaces, and other emerging technologies. This general class of thin films can be switched rapidly between...
David Adams was elected Fellow and President of American Vacuum Society: Science and Technology of Materials, Interfaces and Processing in 2023.

Using machine learning to create rapid stronglink mechanisms
News Article, April 10, 2023 • Computer aided design (CAD) to simulation workflows for nuclear deterrence (ND) have shown dramatic performance improvements with ML. This work targets some of the most inefficient, tedious, and error-prone bottlenecks using new ML-based methods. Common mechanisms such as fasteners and springs can now be quickly identified and reduced to simulation-ready...
A CAD model

Using nonlocal interface problem allows for 7x speedup in large-scale simulations
News Article, May 9, 2023 • Multimaterial problems exist in mission applications such as mechanics and subsurface transport. To capture effects arising from long-range forces at the microscale and mesoscale that aren’t accounted for by classical partial differential equations, the MAThematical foundations for Nonlocal Interface Problems (MATNIP) project team developed a mathematically rigorous interface theory employing...
Analytic solutions u 2D 0,0 for s = 0.4 and u 2D 1,1 for s = 0.6. The behaviour (3.17) close to the boundary is apparent.
Results 26–31 of 31