Los Alamos National Laboratory

Los Alamos National Laboratory

Delivering science and technology to protect our nation and promote world stability
Find Expertise logo

Profile Pages

View homepages for scientists and researchers. Explore potential collaborations and project opportunities. Search the extensive range of capabilities by keyword to quickly find who and what you are looking for.

Alexander Jon Josephson


  • Chemical Science
  • Analytical chemistry
  • Inorganic chemistry
  • Organic chemistry
  • Physical chemistry
  • Energetic materials
  • Computational chemistry
  • Lignin and cellulose breakdown
  • Computational Physics and Applied Mathematics
  • Numerical modeling
  • Coupled multi-physics simulations
  • Mathematics
  • Algorithms
  • Computational fluid dynamics (CFD)
  • Monte Carlo methods
  • Molecular dynamics
  • Direct numerical simulations of fluid turbulence
  • Jacobi-Free Newton Krylov Methods
  • Lagrangian-Averaged Navier Stokes (LANS-alpha) closures
  • Applied Math
  • Deterministic Transport
  • Direct Numerical Simulations (DNS)
  • Statistics
  • Uncertainty quantification
  • Uncertainty analysis
  • Computer and Computational Sciences
  • Open MPI development
  • Earth and Space Sciences
  • Atmospheric chemistry
  • Aerosols


I am a chemical engineer by training with experience in fields of combustion, especially on the formation of soot particles. My experiences as a graduate student are mostly limited to modeling and simulations with a range of different CFD softwares encompasing DNS, LES, RANS, and ODT. Working in particle physics modeling has led to exposure in parameter calibration using Bayesian statistics, model verification, validation, and uncertainty quantification. Currently I am working on wildfire emission prediction using LANL's FireTec and QuicFire softwares.

Before my graduate work, I studied details of the pulp and paper industry extensively as a undergraduate. This included work as a chemical vendor at three papermills doing chemical analysis of recycled fiber cleaners, wet-end papermachine operations, and pulp mill operations. My experience in the paper industry gave me familiarity with complex chemical engineering operations, extensive wood chemistry, and polymer sciences.


PhD, Chemical Engineering, Brigham Young University, Provo, UT, 2018

BS, Bioresource and Science Engineering, University of Washington, Seattle, WA, 2014


LANL Positions

Graduate Research Assistant (2017-Present)

Computational Earth Sciences (EES-16)

Mentor: Rodman R. Linn  


Professional Societies

American Institute of Chemical Engineers

Combustion Institute, Western States Section



Journal Articles

A.J. Josephson, N.D. Gaffin, S.T. Smith, D.O. Lignell, "Modeling Soot Consumption with Bayesian Statistics," (Under review for publication)

A.J. Josephson, D.O.Lignell, A.L. Brown, T.H. Fletcher, "Revision to Modeling Soot Derived from Pulverized Coal," Energy & Fuels, 2016, 30(6), 5198-5199, DOI: 10.1021/acs.energyfuels.6b01007


N.D. Gaffin, A.J. Josephson, D.O. Lignell, "Bayesian Optimization and Soot Consumption," Utah Conference of Undergraduate Research, February 17, 2017, Orem, Utah, United States.

A.J. Josephson, N.D. Gaffin, D.O. Lignell, "Soot Nucleation and Consumption in Oxy-Coal Systems," 2016 AIChE Annual Meeting, November 13-18, 2016, San Francisco, California, United States.

A.J. Josephson, N.D. Gaffin, D.O. Lignell, "Soot Consumption in Oxy-Coal Systems," Western States Section of the Combustion Institute Spring 2016 Meeting, March 21-22, 2016, Seattle, Washington, United States.

A.J. Josephson, D.O. Lignell, "Soot Formation and Secondary Pyrolysis in Oxy-Coal Combustion with Large-Eddy Simulation," 2015 AIChE Annual Meeting, November 8-13, 2015, Salt Lake City, Utah, United States.

A.J. Josephson, D.O. Lignell, "Simulating soot formation in oxy coal combustion using large-eddy simulation," Western States Section of the Combustion Institute Fall 2015 Meeting, October 5-6, 2015, Provo, Utah, United States.

A.J. Josephson, B.J. Isaac, D.O. Lignell, T.H. Fletcher, "Large eddy simulation of an oxy-coal combustor, "9th Meeting of the U.S. Joint Sections of the Combustion Institute, May 17-20, 2015, Cincinnati, Ohio, United States.

D.O. Lignell, B.J. Isaac, A.J. Josephson, T.H. Fletcher, J.N. Thornock, "Large eddy simulation of soot formation in an oxy-coal combustor," 15th International Conference on Numerical Combustion, April 19-22, 2015, Avignon, France.


T.H. Fletcher, D.O. Lignell, T. Holland, A.J. Josephson, A. Richards, "Coal Particle Combustion," The 2015 Stewardship Science Academic Programs Annual Review Symposium, March 11-12, 2015, Sante Fe, New Mexico, United States.