Gavin Wiggins is a research scientist at the Oak Ridge National Laboratory near Knoxville, TN. His current work is developing computational models to simulate the fast pyrolysis of biomass in fluidized reactors. This research is part of the Consortium for Computational Physics and Chemistry for the U.S. DOE Bioenergy Technologies Office. Gavin is also involved in various battery simulation activities as part of the Computer Aided Engineering for Batteries project. As an enthusiastic developer, he is the organizer of the Knoxville CocoaHeads and KnoxPy programming groups.

Get in touch: Email, GitHub, Reddit, Stack Overflow, Twitter


WeathrClip provides current weather conditions, 5-day forecast, hourly forecast, and precipitation radar for your Mac and iPhone.

Un1ts is a comprehensive unit converter for the Mac. It was previously available on the Mac App Store but is now open-source software.


See Gavin’s GitHub profile for examples of his iOS, macOS, Swift and Python code. Organizations on GitHub that he contributes to are Knoxville CocoaHeads, CCPC, KnoxPy, BatterySim, Fluidization, and Chemics.


Combining high and low-order computational models to simulate biomass fast pyrolysis reactors. AIChE Spring Meeting and 8th World Congress on Particle Technology in Orlando, FL on April 23, 2018.

Scraping with Selenium. KnoxPy Meetup in Knoxville, TN on April 5, 2018.

Realm Mobile Database. Knoxville CocoaHeads Meetup in Knoxville, TN on April 18, 2017.

Modeling the impact of biomass particle size distribution and shape on heating behavior during fast pyrolysis. TCS 2016 Symposium in Chapel Hill, NC on November 1, 2016.

Modeling the impact of biomass particle residence time on fast pyrolysis yield and composition. AIChE Annual Meeting in San Francisco, CA on November, 13, 2016.

Firebase for iOS. Knoxville CocoaHeads in Knoxville, TN on August 16, 2016.

NSUserDefaults in Swift. Knoxville CocoaHeads in Knoxville, TN on April 19, 2016.

Low-order modeling of biomass particle mixing and reaction in a bubbling-bed fast pyrolysis reactor. AIChE 2014 Annual Meeting in Atlanta, GA on November 20, 2014.

Particle-scale computational modeling of woody biomass pyrolysis. TCS 2014 Symposium in Denver, CO on September 4, 2014.


If you do not have access to a publication, please contact me and I will be genuinely delighted to send you a copy of the manuscript.

Integrated Particle- and Reactor-Scale Simulation of Pine Pyrolysis in a Fluidized Bed. Energy & Fuels, 32 (10), pp. 10683-10694, 2018.

Chemics-Reactors: A Preliminary Python Program for Implementing Network Models of Multiphase Reactors. Technical Report, ORNL/TM-2017/748, 2018.

Simulating Biomass Fast Pyrolysis at the Single Particle Scale. From the book "Fast Pyrolysis of Biomass", Chapter 11, pp. 231-253, 2017.

Low-Order Modeling of Internal Heat Transfer in Biomass Particle Pyrolysis. Energy & Fuels, 30 (6), pp. 4960-4969, 2016.

Development of a Low-Order Computational Model for Biomass Fast Pyrolysis: Accounting for Particle Residence Time. Technical Report, ORNL/TM-2016/69, 2016.

Coupling DAEM and CFD for simulating biomass fast pyrolysis in fluidized beds. Journal of Analytical and Applied Pyrolysis, 117, pp. 176-181, 2016.

Biomass Particle Models with Realistic Morphology and Resolved Microstructure for Simulations of Intraparticle Transport Phenomena. Energy & Fuels, 29 (1), pp. 242-254, 2015.

Evaluation of Biomass and Coal Briquettes for a Spreader Stoker Boiler Using an Experimental Furnace — Modeling and Test. Clemson University, 2011.

System Modeling of ORNL's 20 MW(t) Wood-fired Gasifying Boiler. Conference: American Flame Research Committee, Pacific Rim Combustion Symposium, 2010.