Robust characteristics method for modelling multiphase visco-elasto-plastic thermo-mechanical problems

Taras V. Gerya, David A. Yuen

Research output: Contribution to journalArticlepeer-review

243 Scopus citations

Abstract

We have extended our previous 2D method [Gerya, T.V., Yuen, D.A., 2003. Characteristics-based marker-in-cell method with conservative finite-differences schemes for modeling geological flows with strongly variable transport properties. Phys. Earth Planet. Interiors 140, 295-320], which is a combination of conservative finite-differences with marker-in-cell techniques to include the effects of visco-elasto-plastic rheology, self-gravitation and a self-consistently derived evolving curvilinear planetary surface. This code is called I2ELVIS and can solve a new class of computationally challenging problems in geodynamics, such as shear localization with large strains, crustal intrusion emplacement of magmas, bending of realistic visco-elasto-plastic plates and core-formation by vigorous shell tectonics activities related to a global Rayleigh-Taylor instability of a metal layer formed around silicate-rich lower density (primordial) core during planetary accretion. We discuss in detail the computational strategy required the rheological constraints to be satisfied at each time step and spatial location. We show analytical benchmarks and examples drawn from comparing between numerical and analogue experiments in structural geology, subducting slab bending with a visco-elasto-plastic rheology and equilibrium spherical configurations from self-gravitation. We have also tested possibilities of future applications by addressing 3D geometries based on multigrid method and including inertial effects in the momentum equation with tracers in order to simulate meteoritic impact events and eventually earthquake instabilities.

Original languageEnglish (US)
Pages (from-to)83-105
Number of pages23
JournalPhysics of the Earth and Planetary Interiors
Volume163
Issue number1-4
DOIs
StatePublished - Aug 15 2007

Bibliographical note

Funding Information:
This work was supported by ETH Research Grants TH-12/04-1, TH-12/05-3, SNF Research Grant 200021-113672/1 and NSF grants from the ITR and CSEDI programs. We thank fruitful discussions with Paul J. Tackley, Boris J.P. Kaus, James A.D. Connolly, Klaus Regenauer-Lieb, Yuri Y. Podladchikov and Oleg V. Vasilyev. We greatly appreciate the very constructive and thorough reviews and suggestions offered by Louis Moresi and Charley Kameyama.

Keywords

  • Free curvilinear surface
  • Inertial effects
  • Numerical algorithm
  • Self-gravitation
  • Visco-elasto-plasticity

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