# PyLith v3.0.2 released

**URL:** <https://community.geodynamics.org/t/pylith-v3-0-2-released/2586>\
**Category:** PyLith\
**Created:** [September 19, 2022, 3:08pm UTC](https://community.geodynamics.org/t/pylith-v3-0-2-released/2586 "2022-09-19T15:08:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![baagaard](https://yyz2.discourse-cdn.com/flex036/user_avatar/community.geodynamics.org/baagaard/32/615_2.png) [@baagaard](https://community.geodynamics.org/u/baagaard)\
**Post date:** [September 19, 2022, 3:08pm UTC](https://community.geodynamics.org/t/pylith-v3-0-2-released/2586/1 "2022-09-19T15:08:27Z")

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# PyLith v3.0.2 now available

I am pleased to announce the release of PyLith 3.0.2, a finite-element code designed to solve dynamic elastic problems and quasistatic viscoelastic problems in tectonic deformation.

You can download the source code and binaries from  
[https://geodynamics.org/resources/pylith](https://geodynamics.org/resources/pylith)

Documentation  
[https://pylith.readthedocs.org/en/v3.0.2](https://pylith.readthedocs.org/en/v3.0.2)

## Release Notes

This is a bug fix release with no new features or changes to the user interface.

- Add check of PyLith version against version requirements specified in metadata of parameter files.
- Update defaults to better match most use cases.
  - Use nonlinear solver.
  - Basis order is 1 for solution fields.
  - Basis order is 0 for Cauchy stress and strain.
  - Use ML algebraic multigrid preconditioner (from Trilinos) instead of GAMG preconditioner for more robust solves. This is a temporary change until we find better GAMG settings.

- Update PETSc to v3.17.3.
- Remove obsolete LaTeX documentation.
- Bug fixes
  - Add `viz` directory missing from `examples/subduction-2d` in source distribution.
  - Project output fields using correct PETSc routine (`DMProjectFieldLabel()`). Fixes memory access bugs in both serial and parallel.
  - Fix build warnings.
  - Fix reordering that causes errors when importing Gmsh files.

- Documentation
  - Add discussion of translating boundary value problem information to parameter settings. Add more code blocks to manual.
  - Add discussion of `examples/troubleshooting-2d` to manual.

### Binary packages

- Added PyQT5 Python module for interactive plotting with matplotlib.
- Update PyLith Parameter Viewer to v2.0.1 (fix errors in packaging).

### Known issues

- The default PETSc options provide a computationally expensive preconditioner when solving incompressible elasticity problems in parallel. We expect to have a more optimal preconditioner in the next release.
- You may still encounter a few bugs when running in parallel; they appear to cases with specific partitioning of the mesh in relation to one or more faults.

**Note** : We are preparing to release v3.0.3 soon. We have fixed several bugs related to running in parallel, but we still have some issues to address.

## Contributors

- Brad Aagaard
- Matthew Knepley
- Charles Williams