MFIX simulation input and output files for the study of particle laden saline gravity currents
MFIX (Multiphase Flow with Interphase eXchanges) simulation input files and raw particle output files. Description of files 1. The directory "MFIX_Setup" contains the MFIX simulation input files for the two simulations Exp19 and Exp35. (MFIX input file (input and boundary conditions) *mfx & MFIX subroutines (*f) and geometry *stl) 2. The directory "time-averaged_slices" contain the time-average slices as *vtu files for Exp19 and Exp35 that can be opened using Paraview (open-source software). 3. The directory "depth-averaged and time-averaged data" contains the python code that reads the depth- and time-averaged data. Note the simulations were run with MFIX-20. The two simulation (Exp19 and Exp35) are 3D two-fluid model (TFM) numerical simulations of liquid-particle mixture, where the fluid and particles are saline water and silica particles, respectively. The finite-volume method is used to solve the mass, momentum and energy equations of the two phases and the solid-fluid coupling is done using drag and pressure terms. 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/.
nonGeographicDataset
https://webapps.bgs.ac.uk/services/ngdc/accessions/index.html#item186552
name: Data
function: download
https://doi.org/10.5285/3f772a04-bab2-4952-99ef-49c54e8032de
name: Digital Object Identifier (DOI)
function: information
http://data.bgs.ac.uk/id/dataHolding/13608316
eng
geoscientificInformation
publication
2008-06-01
Pyroclastic rocks
Citable Data
NGDC Deposited Data
Lava flows
Rheology
Volcanoes
revision
2022
NERC_DDC
2023-05-01
2023-12-01
creation
2024-11-13
notApplicable
Pyroclastic Density Currents (PDCs) are among the most hazardous geological phenomena, posing challenges for predicting their impacts during eruptions. PDCs are complex, multiphase flows where density stratification significantly influences mixing, deposition, and runout. Simplified models like box models and depth-averaged approaches often assume vertically well-mixed currents, but the impact of these assumptions on mobility has been a focus of recent studies. To explore the effects of density stratification and buoyancy reversal on PDC behavior, we conducted 3D multiphase flow simulations based on heated particle-laden saline water experiments. Results showed distinct behavior for buoyant and non-buoyant currents: buoyant currents exhibited a unique density profile with a minimum at the nose, while non-buoyant currents followed typical Rousean stratification. These differences arise from interactions between density stratification and thermal buoyancy, which affect flow runout. Our findings reveal that fluid buoyancy slows particle settling, enhances vertical mixing, and limits spanwise spreading, aligning with experimental observations. However, the bulk Richardson number fails to accurately describe entrainment in these flows, suggesting a need to refine parameterization in depth-averaged models to better capture the transient nature of PDCs and improve hazard predictions.
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
.dat
The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
University of Edinburgh
originator
University of Oregon
originator
Istituto Nazionale di Geofisica e Vulcanologia
originator
British Geological Survey
distributor
British Geological Survey
pointOfContact
British Geological Survey
Environmental Science Centre,Keyworth
NOTTINGHAM
NG12 5GG
United Kingdom
+44 115 936 3100
pointOfContact
2025-05-04