HR: 1340h
AN: V33D-1484    [Abstracts]
TI: An Approach to Simulation of the Turbulent Multifield/Multiphase Dynamics of Volcanic Conduits and Plumes
AU: * Ogden, D E
EM: dogden@es.ucsc.edu
AF: Earth Sciences Department, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 United States
AU: Wohletz, K H
EM: wohletz@lanl.gov
AF: Earth and Environmental Science Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545 United States
AU: Glatzmaier, G A
EM: glatz@es.ucsc.edu
AF: Earth Sciences Department, University of California at Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 United States
AB: The shape and size of volcanic eruption conduits play a large role in determining the character of eruption phenomena. Conduits for explosive eruptions evolve with time during the eruption greatly affecting mass fluxes and the fate of degassed volatile constituents. Previous modeling has focused on compressible fluid dynamics of gas and solid particle mixtures moving within a cylindrical conduit and expanding into the atmosphere. However, it is clear that evolution of the conduit itself is influenced by the erupting mixture and the flow field of the mixture is controlled in part by the conduit. In order to address this important aspect of eruption dynamics, both compressible fluid flow and solid mechanics must be solved simultaneously. Two different three-dimensional state of the art computer codes have been developed at Los Alamos National Laboratories that are capable of simulating these dynamics together, CFDLib and SAGE. CFDLib is a compilation of well-tested computational fluid dynamics approaches suited for a wide range of fluid and solid dynamics, using well-known Marker-And-Cell (MAC) and Implicit Continuous-fluid Eulerian (ICE) techniques. SAGE employs adaptive grid Eulerian techniques to provide local areas of high resolution for dynamics of complex materials. We are benchmarking and validating these codes for geophysical application as a preliminary step toward modeling the three-dimensional dynamics of volcanic conduits.
DE: 8400 VOLCANOLOGY
DE: 8414 Eruption mechanisms
DE: 3210 Modeling
DE: 3230 Numerical solutions
SC: Volcanology, Geochemistry, Petrology [V]
MN: 2004 AGU Fall Meeting