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Work Plans / 2011-2016 Work Plans /

2011-2016 PyLith Dev Plans

PyLith Development Plans Software development plans for PyLith

Version 1.6 June training session OPTIMIZATION Multiple fields in a single Sieve section done At this point, only used for parameters of fault constitutive models.

GENERAL HDF5 output done Output into a single HDF5 file or an HDF5 file with raw binary files for the datasets. Datasets are written using MPI I/O if available in both cases. Add .Xdmf metadata files associated with HDF5 files to permit reading of HDF5 files with ParaView and Visit.

Uniform global refinement done 98% QUASI-STATIC Added 2-D plane strain versions of the 3-D generalized Maxwell viscoelastic rheology. done DYNAMIC Numerical damping via viscosity done Added numerical damping via a viscosity parameter that is independent of the bulk constitutive model. The viscosity is applied during the time integration.

COMPUTATIONAL SCIENCE None Version 1.7 (Fall 2011) OPTIMIZATION Multiple fields in a single Sieve section intermediate 0% Parameters for bulk constitutive models Parameters and fields related to fault implementation Will reduce memory use and provide speedup due to better use of memory cache.

CLEANUP Separate elastic solution into elasticPrestep() function easy 0% Add —initialize_only property to Problem easy 0% Permit users to stop simulation before time stepping in order to diagnose parameter settings.

GENERAL Refactor initial fault tractions easy 5% Create Nucleation object with spatial and temporal perturbation of tractions from initial value

QUASI-STATIC Add strain hardening/softening to Drucker-Prager elastoplastic models. DYNAMIC Compute stable time step for explicit time integration easy 5% Attenuation via generalized Maxwell model (bulk and shear relaxation) intermediate 50% COMPUTATIONAL SCIENCE Scalable mesh distribution intermediate 0% Permit running large problems where the mesh cannot fit on a single compute node.

Accelerate FE integrations using GPUs difficult 25% Will provide significant speedup to simulations run by many users because most are running on desktop machines that have GPUs.

Version 2.0 OPTIMIZATION TBD CLEANUP TBD GENERAL Moment tensor point sources Moment tensor point sources provide a mesh independent deformation source that is better suited for Green’s function calculations than slip on a fault surface via cohesive cells. difficult

QUASI-STATIC Time-step based on strain rate intermediate Pressure field for incompressible elasticity problems expert DYNAMIC TBD COMPUTATIONAL SCIENCE Use KD tree search algorithm to allow output of time histories at an arbitrary location difficult Use interpolated meshes (cells, faces, edges, vertices) to permit higher order basis functions expert Support for arbitrary number of solution fields (e.g., displacement, temperature, pressure) expert Adjust integrations to support multi-physics calculations. Beyond Version 2.0 OPTIMIZATION TBD CLEANUP TBD GENERAL Combined prescribed slip / spontaneous rupture fault condition Use fault constitutive model to control slip on fault except during episodes of prescribed slip. Need some way to describe when to turn on/off prescribed slip.


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