Gavin Wiggins

Gavin Wiggins

I'm a research scientist at the Oak Ridge National Laboratory in Tennessee. My 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. I am also involved in various battery simulation activities as part of the Consortium for Advanced Battery Simulation project. As an enthusiastic developer, I organize the Knoxville CocoaHeads and KnoxPy programming groups.

Email / GitHub / Keybase / ORCID / Twitter

Applications


WeathrClip. WeathrClip provided current weather conditions, 5-day forecast, hourly forecast, and precipitation radar for the Mac and iPhone. I discontinued this app because the Weather Underground API is no longer available.

Un1ts. A comprehensive unit converter for the Mac. The original version of the app was written in Objective-C and was temporarily removed from the App Store. I have rereleased Un1ts as a completely new version written in Swift and SwiftUI to support the latest features of macOS. [URL]

Posts


Swift Programming for macOS. There are plenty of books, videos, and online resources for developing iOS apps. Despite the fact that iPhone and iPad apps require a Mac for code development, there is very little information about actually creating native Mac applications. The examples in this post demonstrate various aspects of Mac app development using the latest versions of Swift and SwiftUI. Hopefully these examples will provide a useful resource for Mac developers. [Read]

Exponential Sums. Exponential sums are an area of math represented by a series with terms that are complex exponentials. These types of sums are related to Fourier analysis and number theory. Plotting exponential sums produces various designs based on the type of input function. [Read]

Python Basics. Some of my notes related to the awesomeness that is the Python programming language. [Read]

Presentations


Reduced-Order Modeling Techniques for Fluidized-Bed Biomass Pyrolysis. TC Biomass conference in Rosemont, IL on October 7, 2019. [PDF]

Python Workshop. KnoxPy meeting in Knoxville, TN on September 5, 2019. [PDF]

A Pythonic Equivalent Circuit Model for Battery Research. SciPy 2019 conference in Austin, TX on July 10, 2019. [PDF]

Using Python to Model Biomass Pyrolysis Reactors. SciPy 2019 conference in Austin, TX on July 10, 2019. [PDF]

Unit Conversion in Swift. Knoxville CocoaHeads meeting in Knoxville, TN on April 29, 2019. [PDF]

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. [PDF]

Scraping with Selenium. KnoxPy meeting in Knoxville, TN on April 5, 2018. [PDF]

Realm Mobile Database. Knoxville CocoaHeads meeting in Knoxville, TN on April 18, 2017. [PDF]

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. [PDF]

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. [PDF]

Firebase for iOS. Knoxville CocoaHeads meeting in Knoxville, TN on August 16, 2016. [PDF]

NSUserDefaults in Swift. Knoxville CocoaHeads meeting in Knoxville, TN on April 19, 2016. [PDF]

Overview of NumPy in Python. KnoxPy meeting in Knoxville, TN on April 7, 2016. [PDF]

An Introduction to Git and GitHub. Knoxville CocoaHeads meeting in Knoxville, TN on October 20, 2015. [PDF]

Resolution Independence with PaintCode. Knoxville CocoaHeads meeting in Knoxville, TN on June 9, 2015. [PDF]

Modeling Thermochemical Biomass Pyrolysis in Python. PyKnoxville meeting in Knoxville, TN on April 8, 2015. [PDF]

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. [PDF]

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

Publications


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. [URL]

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

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

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

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

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

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

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

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



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