Active Projects

Turbulence-chemistry interactions in the ocean (2017–)

Emily Klee Luz Pacheco Kyle Niemeyer

Turbulent mixing and biogeochemical processes in the ocean can interact when occurring at similar time scales; for example, carbonate formation occurs at similar time scales as small-scale turbulence in the upper ocean, while submesoscale eddies evolve over the same time scales as plankton blooms. This project seeks to understand how these processes interact with each other, which has implications for global biogeochemical cycles. It involves accurate large-eddy simulations of upper-ocean turbulence and detailed biogeochemical kinetic models.

Effects of Langmuir turbulence on upper ocean carbonate chemistry (2018)

Ignition, propagation, and emissions of smoldering combustion (2016–)

W. Jayani Jayasuriya Tejas Mulky Kyle Niemeyer

Smoldering combustion plays an important role in wildfires, since it can contribute significantly to carbon emissions and also transition back to the flaming mode of combustion. However, the physical and chemical processes that control the ignition, propagation, and emissions of smoldering in woody fuels are not well understood, and this project is working to fix that.

Smouldering combustion in cellulose and hemicellulose mixtures: Examining the roles of density, fuel composition, oxygen concentration, and moisture content (2022)

Reduced Gas-Phase Kinetic Models for Burning of Douglas Fir (2019)

Effects of fuel content and density on the smoldering characteristics of cellulose and hemicellulose (2019)


Inactive Projects

Arc position sensing for vacuum arc remelting furnaces (2015–2016)

Miguel Soler Kyle Niemeyer

Vacuum arc remelting (VAR) furnaces have been used for decades to produce high-quality metal ingots for demanding applications like in the aerospace and biomedical fields, but the extreme conditions inside a furnace make diagnostics and control of the process challenging. This project analyzed an approach for sensing the position of the electrical arc inside a VAR furnace using finite element simulations.

Analysis of an approach for detecting arc positions during vacuum arc remelting based on magnetic flux density measurements (2018)

Open database of combustion measurements (ChemKED/ (2016–2018)

Morgan Mayer Braam Beresford Maria Politi Kyle Niemeyer

The combustion community has generated many thousands of fundamental combustion data points using a variety of experimental apparatuses, which are extremely useful for validating and refining models for fuel oxidation. However, most such data are either represented via figures or tables, not openly accessible, or stored in a format not easily readable by people or machines. This project is designing human and machine-readable data standards for combustion measurements, and building an open, community database for them (along with tools to use the data).

ChemKED: A human- and machine-readable data standard for chemical kinetics experiments (2018)

Assessing impacts of discrepancies in model parameters on autoignition model performance: A case study using butanol (2018)

Pulse detonation engine for advanced oxy-combustion of coal-based fuels (2015–2019)

Matt Zaiger Kyle Niemeyer

This project is investigating a concept for efficient electrical power generation using a pulse detonation engine (PDE) coupled with direct power extraction via a magnetohydrodynamic (MHD) generator. The system is particularly well-suited for pure oxygen combustion (oxy-combustion) since it doesn't have any moving interior parts, so it could offer a viable approach to producing power efficiently and capturing the carbon from the exhaust.

Swept time-space domain decomposition (2015–2021)

Dan Magee Anthony Walker Kyle Niemeyer

Typical approaches to using supercomputing systems to solve large systems of partial differential equations, like those governing fluid flow, require significant amounts of memory transfer at every computational time step. This project is developing a method to reduce the number of communication steps compared with typical approaches, with the goal of improving overall performance.

Applying the swept rule for solving explicit partial differential equations on heterogeneous computing systems (2020)

Accelerating solutions of one-dimensional unsteady PDEs with GPU-based swept time–space decomposition (2018)

Turbulent combustion modeling (2017–2022)

AJ Fillo Kyle Niemeyer

Most practical combustion phenomena are turbulent, but turbulent flames pose a challenging modeling problem due to the complex interactions between fluid flow, chemical kinetics, and thermodynamics. We are both studying the turbulence-chemistry interactions that occur in the combustion of practical fuels, and also developing better modeling techniques and best practices.

Assessing diffusion model impacts on enstrophy and flame structure in turbulent lean premixed flames (2022)

Assessing the impact of multicomponent diffusion in direct numerical simulations of premixed, high-Karlovitz, turbulent flames (2021)

A fast, low-memory, and stable algorithm for implementing multicomponent transport in direct numerical simulations (2020)