MFIX simulation input files and results of simulation of fragmentation-induced fluidization, and laboratory analyses of volcanic pyroclastic density current material

Dataset title	MFIX simulation input files and results of simulation of fragmentation-induced fluidization, and laboratory analyses of volcanic pyroclastic density current material
Dataset creators	Eric Breard, University of Edinburgh Sylvain Charbonnier, University of South Florida, USA Josef Dufek, University of Oregon, USA Valentin Gueugneau, University of South Florida, USA
Dataset theme	Geoscientific Information
Dataset abstract	MFIX (Multiphase Flow with Interphase eXchanges) simulation input files and results of simulation of fragmentation-induced fluidization, and laboratory analyses of volcanic pyroclastic density current material. The data consists of: the Fortran90 input files for the MFIX (Multiphase Flow with Interphase eXchanges) TFM simulation runs the postprocessed MFIX results from our simulations present within Excel sheets laboratory results on the particle shape, size distribution and porosity of the volcanic granular mixtures, presented within Excel sheets. The dataset presented was gathered to investigate the role of compaction, resulting from particle fragmentation, within volcanic granular flows known as pyroclastic density currents. The presented results were obtained from a combination of laboratory analyses and numerical modelling, using Computational Fluid Dynamics. In the laboratory, characterization of the particle size distributions and shape of volcanic grains was undertaken to understand their packing properties. Using the Two-Fluid Model (TFM), an Eulerian-Eulerian method, I was able to simulate the effect of particle breakage on natural scale volcanic mixtures. This model supports a broad range of capabilities for dense multiphase flow. The code was used to investigate the role of particle breakage in pyroclastic density currents, which alters the maximum packing of the granular mixture and ultimately the concentration of the flow during transport. Because the solid phase is immersed in air, the code allowed me to simulate the self-fluidization of the volcanic mixture and the effect on its flowability. These simulations enable me to propose a new process that can play a large role in the occurrence of long runout deadly pyroclastic density currents: Fragmentation-Induced Fluidization. The laboratory work was conducted at the University of Oregon (USA) while the numerical work was completed by running the simulations on the UKRI ARCHER2 HPC and the Talapas Cluster from the University of Oregon (US). The data processing was ongoing from Augst 2021 to December 2021 (Lab analyses) and February 2022 to August 2022 (HPC work). The MFIX simulation results have been post-processed using ParaView open-source software but can be reproduced by the user using the MFIX custom-changed subroutines and input files contained within the dataset. The data was collected to test the hypothesis that compaction, and subsequent self-fluidization is key to the long-runout of pyroclastic density currents. Specialized audience that work on granular media and volcanic flows. The MFIX code that is modified from the core code from the Department of Energy (DOE) is all present. The missing core code can be downloaded from the DOE department https://mfix.netl.doe.gov/. All the experimental data from lab experiments are presented.
Dataset content dates	Data processing was ongoing from Augst 2021 to December 2021 (Lab analyses) and February 2022 to August 2022 (HPC work).
Dataset spatial coverage	Not applicable
Dataset supply format	MS Excel Text files
Dataset language	English-United Kingdom
Dataset discovery metadata record	Discovery Link to the dataset's BGS Discovery Metadata record
Dataset publisher	NERC EDS National Geoscience Data Centre
Dataset publication date	17th November 2023
Dataset citation text	Breard, E., Charbonnier, S., Dufek, J., Gueugneau, V. (2023). MFIX simulation input files and results of simulation of fragmentation-induced fluidization, and laboratory analyses of volcanic pyroclastic density current material. NERC EDS National Geoscience Data Centre. (Dataset). https://doi.org/10.5285/a49db9b4-a44e-4a5d-9fd7-d5021bdfc770
Constraints and terms of use	This data set is available under Open Government Licence, subject to the following acknowledgement accompanying any reproduced materials: "Contains data supplied by permission of the Natural Environment Research Council [YEAR]".
Access the dataset	https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item182973
Further information	Breard, E.C.P., Dufek, J., Charbonnier, S. et al. The fragmentation-induced fluidisation of pyroclastic density currents. Nat Commun 14, 2079 (2023). https://doi.org/10.1038/s41467-023-37867-1