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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Comparison Between Simulated And Experimental Au-ion Profiles Implanted in nanocrystalline ceria
Radiation response of nanocrystalline ceria films deposited on a silicon substrate was investigated under a 3-MeV Au-ion irradiation at 300 K. A uniform grain growth cross the ceria films is observed and effective densification of the ceria thin films occurs during irradiation. The Au ion profiling was measured by secondary ion mass spectrometry (SIMS) and compared to the Au ion distribution predicted by the Stopping and Range of Ions in Solids (SRIM) code. It is observed that the Au-ion penetration depth is underestimated in comparison with the SIMS measurements. An overestimation of the electronic stopping power for heavy incident ions in the SRIM program may account for the discrepancies between the calculations and the SIMS experimental results. This work presents an approach to compensate the overestimation of the electronic stopping powers in the SRIM program by adjusting the nanocrystalline ceria target density to better predict the ion implantation profile.
Heat transfer simulations of the UO2 particle–graphite system in TREAT fuel
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Benchmark exercise for fluid flow simulations in a liquid metal fast reactor fuel assembly
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Comparison of Darcy's law and invasion percolation simulations with buoyancy-driven CO2-brine multiphase flow in a heterogeneous sandstone core
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Predictive nuclear power plant outage control through computer vision and data-driven simulation
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A study of propagation of spherically expanding and counterflow laminar flames using direct measurements and numerical simulations
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Direct numerical simulations of probe effects in low-pressure flame sampling
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Large-eddy simulation of ash deposition in a large-scale laboratory furnace
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Capturing differential diffusion effects in large eddy simulation of turbulent premixed flames
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Parallel performance optimizations on unstructured mesh-based simulations
This paper addresses two key parallelization challenges the unstructured mesh-based ocean modeling code, MPAS-Ocean, which uses a mesh based on Voronoi tessellations: (1) load imbalance across processes, and (2) unstructured data access patterns, that inhibit intra- and inter-node performance. Our work analyzes the load imbalance due to naive partitioning of the mesh, and develops methods to generate mesh partitioning with better load balance and reduced communication. Furthermore, we present methods that minimize both inter- and intranode data movement and maximize data reuse. Our techniques include predictive ordering of data elements for higher cache efficiency, as well as communication reduction approaches. We present detailed performance data when running on thousands of cores using the Cray XC30 supercomputer and show that our optimization strategies can exceed the original performance by over 2×. Additionally, many of these solutions can be broadly applied to a wide variety of unstructured grid-based computations.
Efficient workflow for simulation of multifractured enhanced geothermal systems (EGS)
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Surrogate modeling of advanced computer simulations using deep Gaussian processes
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