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Alexander Jon Josephson


  • Chemical Science
  • Analytical chemistry
  • Organic chemistry
  • Physical chemistry
  • Computational chemistry
  • Lignin and cellulose breakdown
  • Computational Physics and Applied Mathematics
  • Numerical modeling
  • Coupled multi-physics simulations
  • Mathematics
  • Algorithms
  • Computational fluid dynamics (CFD)
  • Direct numerical simulations of fluid turbulence
  • Applied Math
  • Deterministic Transport
  • Direct Numerical Simulations (DNS)
  • Statistics
  • Uncertainty quantification
  • 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. Thus far, my experiences 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 primarily 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 an 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

Dissertation: "Modeling Soot Formation Derived from Solid Fuels"

Advisor: David O. Lignell

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 Association for Aerosol Research (2018-Present)

Combustion Institute, Western States Section (2015-Present)

American Institute of Chemical Engineers (2015-2017)

Technical Association of Pulp and Paper Industries (2011-2014)



Journal Articles

A.J. Josephson, T.M. Holland, R.R. Linn, "Predicting the Particle Emission Source Term in a Reduced-order Fire Spread Model," (pending submission)

A.J. Josephson, E.M. Hopkins, D.O. Lignell, R.R. Linn, "Mono-dispersed Modelling of Soot in Solid Complex Fuel Systems," (submitted for publication)

A.J. Josephson, D.O. Lignell, R.R Linn, "Modeling Soot Formation from Solid Complex Fuels," Combustion and Flame, 2018, 196, 265-283, DOI: 10.1016/j.combustflame.2018.06.020

A.J. Josephson, N.D. Gaffin, S.T. Smith, D.O. Lignell, "Modeling Soot Consumption with Bayesian Statistics,"  Energy & Fuels, 2017, 31(10), 11291-11303, DOI: 10.1021/acs.energyfuels.6b01007

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



A.J. Josephson, T.M. Holland, R.R. Linn, "Modeling Particle Emission Formation in Wildland and Urban Fires," Xth International Aerosol Conference, September 2-7, 2018, Saint Louis, Missouri, United States.

A.J. Josephson, R.R. Linn, D.O. Lignell, "Simplified Modeling for Soot Formation from Solid Fuels," Western States Section of Combustion Institute Spring 2018 Meeting, March 25-27, 2018, Bend, Oregon, United States.

D.O. Lignell, A.J. Josephson, B.J. Isaac, K. Brinkerhoff, "Large Eddy Simulation of Soot Formation in Oxy-Coal Combustion," 2017 AIChE Annual Meeting, October 29-November 3, 2017, Minneapolis, Minnesota, United States.

A.J. Josephson, E. Hopkins, R.R. Linn, D.O. Lignell, "Modeling Soot Formation from Solid Complex Fuels," Western States Section of the Combustion Institute Fall 2017 Meeting, October 2-3, 2017, Laramie, Wyoming, United States.

A.J. Josephson, R.R. Linn, D.O. Lignell, "Detailed Modeling of Soot Formation from Solid Fuels," 9th FM Global Open Source CFD Fire Modeling Workshop, May 9-10, 2017, Norwood, Massachusetts, United States.

A.J. Josephson, T.H. Fletcher, D.O. Lignell, "Modeling Soot in Coal Systems," 10th US National Combustion Meeting, April 23-26, 2017, College Park, Maryland, United States.

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.


E. Hopkins, R.R. Linn, A.J. Josephson, "Sooting Potential of Biomass in Wildfire Simulations," 2017 Los Alamos National Laboratory Student Symposium, August 9, 2017, Los Alamos, New Mexico, United States.

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.