
Key Links
Stephen J DeWitt
Computational Scientist: Large-Scale Simulations
Bio
Dr. DeWitt’s research lies at the intersection of high-performance computing and the study of microstructure evolution in materials. His current work centers on the development of scalable phase-field simulation codes for heterogeneous computer architectures and the use of these codes to study microstructure evolution in metal alloys during additive manufacturing. Particularly in the context of additive manufacturing, he is interested in multiscale models and how part-scale thermal fields influence the microstructure through the part. He has also applied phase-field and level set methods to investigate microstructure evolution in magnesium alloys and electrochemical systems. To extract the most value from computationally intensive simulations, he leverages techniques from the fields of machine learning, uncertainty quantification, data assimilation, and materials informatics.
Appointments
2022 - Present: R&D Staff, Computational Sciences and Engineering Division, Oak Ridge National Laboratory
2019 - 2022: R&D Associate Staff, Computational Sciences and Engineering Division, Oak Ridge National Laboratory
2017 - 2019: Assistant Research Scientist (Research Faculty), Dept. of Materials Science and Engineering, University of Michigan
2015 - 2017: Research Investigator (Research Faculty), Dept. of Materials Science and Engineering, University of Michigan
Education
PhD: Applied Physics, University of Michigan, 2015
MS: Applied Physics, University of Michigan, 2011
BSE: Engineering Physics, University of Michigan, 2009
Simulation Software
MEUMAPPS: https://code.ornl.gov/meumapps/meumapps
adamantine: https://github.com/adamantine-sim/adamantine
Thermo4PFM: https://github.com/ORNL/Thermo4PFM
AMPE: https://github.com/LLNL/AMPE
PRISMS-PF: https://prisms-center.github.io/phaseField