He is a directorate fellow in the Nuclear Science and Technology Department at Idaho National Laboratory (INL). With a career spanning nearly 40 years at INL, he has extensive experience in many key areas of computational methods research and model development, including nonlinear thermo-mechanics, fracture mechanics, shock wave and detonation, and thermal plasma spray. From 2009 to 2016, he led the team developing BISON, INL’s state-of-the-art nuclear fuel performance code, which is currently in use at numerous national and international laboratories and nearly 20 universities with growing acceptance in industry. He holds bachelor’s and master’s degrees from Brigham Young University and a doctorate from the University of Idaho, all in mechanical engineering. He is an affiliate professor at the University of Idaho and has served as adviser to numerous graduate students. He is the author or co-author of approximately 180 scientific publications, including over 50 peer-reviewed journal articles, and has several thousand citations to his work.
He is a research and development engineer in the Experiment Analysis Group of Nuclear Science and Technology at Idaho National Laboratory. In his present position, he leads in-pile instrumentation development for transient irradiation testing and is a principal investigator for transient testing of metallic fuels. He is an experiment safety and performance analyst for experiments at the Advanced Test Reactor and the Transient Reactor Test Facility. In addition, he is a technical lead for measurement of thermophysical properties of nuclear materials. He has expertise in energy transport in condensed matter, liquids, gases, and material interfaces. He has significant experience in advanced measurements of thermophysical properties of nuclear materials using multi-scaled approaches, including nano-scale measurements using atomic force microscopy, laser-based microscopic photothermal methods, and bench-scale high temperature thermal conductivity techniques. He also has expertise in numerical and commercial finite element analysis. He holds bachelor’s and master’s degrees from Utah State University and a joint doctorate from Utah State University and Universite de Reims Champagne-Ardenne. He is a member of American Nuclear Society (ANS) and American Society of Mechanical Engineers. He was the founding president of the ANS Student Chapter at Utah State University and currently serves as an Executive Committee member for the Material Science and Technology Division of ANS.
He is responsible for the development of science-based simulations for use in accelerating energy technology development. He was architect of the widely used, open-source multiphase CFD code, known as Multiphase Flow with Interphase eXchanges (MFIX), and led the development of software for linking process- and device-scale simulations and the C3M chemical kinetics software. As a fellow of the American Academy of Chemical Engineers, he specializes in multiphase flow, computational fluid dynamics (CFD), fluidization, and various energy processes. He is a founding technical director of National Energy Technology Laboratory’s Carbon Capture Simulation Initiative (CCSI). He has received numerous awards, such as the Energy Secretary’s Achievement Honor Award and American Institute of Chemical Engineers (AIChE) Fluidization Process Recognition Award. His many publications address topics, such as gasifier advanced simulation models; multiphase hydrodynamics of gas-solids flow; modeling coal gasification processes; hydrodynamics of particle segregation in fluidized beds; and simulation of granular layer inversion in liquid fluidized beds. He has a bachelor’s in chemical engineering from the Indian Institute of Technology (BHU) Varanasi, and a master’s and doctorate from the Illinois Institute of Technology in Chicago.
He is senior staff scientist at Idaho National Laboratory. His experience covers a wide range of research topics related to nuclear reactor thermal-hydraulics, including two-phase flow modeling and simulation, numerical methods development in two-phase flow simulations, reactor safety analysis, system analysis code development, computational fluid dynamics in nuclear engineering, experimental two-phase flow, and experimental study on critical heat flux. His current work focuses on research and development of next-generation reactor system analysis code, modeling and simulation of two-phase flow, and thermal-hydraulics analysis to support advanced reactor designs (e.g., gas-cooled and molten salt-cooled high-temperature reactors). He has a doctorate in nuclear engineering from the University of Illinois at Urbana-Champaign, and earned a bachelor's degree from Tsinghua University, Beijing, China.
He is a staff research scientist working in the Nuclear System Design and Analysis Division at Idaho National Laboratory (INL). He has expertise in heat transfer, fluid mechanics, thermal design, thermodynamics and nuclear safety analyses. Over the last few years, he has been researching high temperature heat exchanger design and optimization, system integration and power conversion systems, and safety and reliability for Advanced Reactor Concepts, and also has extensive experience in the design and construction of large-scale experimental systems for nuclear and thermal-hydraulic research. He has more than 12 years of research and development experience in nuclear/thermal engineering and has been involved in several academic, industrial, and cross-discipline national laboratory research projects. He is currently working to develop a new multi-loop, multi-fluid advanced test facility designed to examine thermal hydraulic and materials issues associated with advanced nuclear reactor technologies. He has authored two books; contributed chapters to technical books on advanced reactors, thermal systems and process heat transfer; published over 100 peer-reviewed publications; and served as the INL lead for numerous partnerships. He holds an adjunct faculty appointment in the Department of Mechanical, Aerospace, and Nuclear Engineering at Rensselaer Polytechnic Institute. He obtained his bachelor’s in mechanical engineering with concentration in robotics and controls from Wilkes University in Pennsylvania, a master’s degree in nuclear engineering with a minor in mechanical engineering from Oregon State University, a master’s degree in engineering management from University of Idaho, and doctorate in nuclear engineering from University of Idaho.
He has more than 10 years of experience in various capacities spanning nuclear and chemical engineering. His research expertise is in the design, modeling, simulation, and analysis of experiments in the Advanced Test Reactor (ATR) at Idaho National Laboratory; chemical processes including the manufacturing of high purity polysilicon and oil separation from brine water; and both test and space nuclear reactors. He is an adjunct professor at the University of Utah, where he collaborates on nano- to micron-thick film coating projects, which are done with a fluidized bed chemical vapor deposition (FB-CVD) reactor. He has also been a senior reactor operator of the TRIGA reactor at the University of Utah. His recent work includes the modeling and simulation of corrosion on the surfaces of various cladding materials to be tested at ATR, which is a coupling of nuclear activation, radiolysis of water, chemical systems simulation with the chemical kinetics, and thermodynamics from a selected set of corrosion, acid/base and electrochemical reactions.
With 23 years of experience in engineering design, safety, and analysis of nuclear and energy systems, he has served as a principal member of the technical staff at Sandia National Laboratories since 1995, as well as a research associate professor at the University of New Mexico since 2012. His key areas of expertise include computational fluid dynamics, turbulence, dimpling, swirl, advanced manufacturing, and heat transfer. He is experienced with gas, water, molten salt, and heavy-water cooled reactors, including large, small, and miniature reactors. His primary technical achievements include right-sized dimpling, the LIKE algorithm, design of advanced fire sprinklers, isotropic turbulence decay model, development of five new vortices, a vortex unification theory, dynamic swirl modeling, and central recirculation zone modulation. He earned a doctorate in nuclear engineering from the University of New Mexico, as well as a doctorate in philosophy and apologetics from Trinity Seminary and College. He earned two master’s degrees in applied mathematics from the University of New Mexico and mechanical engineering from the University of Idaho, and a bachelor’s in nuclear engineering from the University of California - Santa Barbara. He is currently writing an engineering book for the Springer Publishing Company entitled, “Applied Computational Fluid Dynamics and Turbulence Modeling.”
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