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1.0b2

  • Release date: Still under development.

1.0b1

Around 140 pull requests were merged. Thanks to all who contributed to this release (in alphabetical order): Abhinav Muta, Aditya Bhosale, Amal Sebastian, Ananyo Sen, Antonio Valentino, Dinesh Adepu, Jeffrey D. Daye, Navaneet, Miloni Atal, Pawan Negi, Prabhu Ramachandran, Rohan Kaushik, Tetsuo Koyama, and Yash Kothari.

  • Release date: 1st March 2022.
  • Enhancements:
    • Use github actions for tests and also test OpenCL support on CI.
    • Parallelize the build step of the octree NNPS on the CPU.
    • Support for packing initial particle distributions.
    • Add support for setting load balancing weights for particle arrays.
    • Use meshio to read data and convert them into particles.
    • Add support for conditional group of equations.
    • Add options to control loop limits in a Group.
    • Add pysph binder, pysph cull, and pysph cache.
    • Use OpenMP for initialize, loop and post_loop.
    • Added many SPH schemes: CRKSPH, SISPH, basic ISPH, SWE, TSPH, PSPH.
    • Added a mirror boundary condition along coordinate axes.
    • Add support for much improved inlets and outlets.
    • Add option --reorder-freq to turn on spatial reordering of particles.
    • API: Integrators explicitly call update_domain.
    • Basic CUDA support.
    • Many important improvements to the pysph Mayavi viewer.
    • Many improvements to the 3D and 2D jupyter viewer.
    • Application.customize_output can be used to customize viewer.
    • Use ~/.compyle/config.py for user customizations.
    • Remove pyzoltan, cyarray, and compyle into their own packages on pypi.
  • Bug fixes:
    • Fix issue with update_nnps being called too many times when set for a group.
    • Many OpenCL related fixes and improvements.
    • Fix bugs in the parallel manager code and add profiling information.
    • Fix hdf5 compressed output.
    • Fix pysph dump_vtk
    • Many fixes to various schemes.
    • Fix memory leak with the neighbor caching.
    • Fix issues with using PySPH on FreeBSD.

1.0a6

90 pull requests were merged for this release. Thanks to the following who contributed to this release (in alphabetical order): A Dinesh, Abhinav Muta, Aditya Bhosale, Ananyo Sen, Deep Tavker, Prabhu Ramachandran, Vikas Kurapati, nilsmeyerkit, Rahul Govind, Sanka Suraj.

  • Release date: 26th November, 2018.
  • Enhancements:
    • Initial support for transparently running PySPH on a GPU via OpenCL.
    • Changed the API for how adaptive DT is computed, this is now to be set in the particle array properties called dt_cfl, dt_force, dt_visc.
    • Support for non-pairwise particle interactions via the loop_all method. This is useful for MD simulations.
    • Add support for py_stage1, py_stage2 ..., methods in the integrator.
    • Add support for py_initialize and initialize_pair in equations.
    • Support for using different sets of equations for different stages of the integration.
    • Support to call arbitrary Python code from a Group via the pre/post callback arguments.
    • Pass t, dt to the reduce method.
    • Allow particle array properties to have strides, this allows us to define properties with multiple components. For example if you need 3 values per particle, you can set the stride to 3.
    • Mayavi viewer can now show non-real particles also if saved in the output.
    • Some improvements to the simple remesher of particles.
    • Add simple STL importer to import geometries.
    • Allow user to specify openmp schedule.
    • Better documentation on equations and using a different compiler.
    • Print convenient warning when particles are diverging or if h, m are zero.
    • Abstract the code generation into a common core which supports Cython, OpenCL and CUDA. This will be pulled into a separate package in the next release.
    • New GPU NNPS algorithms including a very fast oct-tree.
    • Added several sphysics test cases to the examples.
  • Schemes:
    • Add a working Implicit Incompressible SPH scheme (of Ihmsen et al., 2014)
    • Add GSPH scheme from SPH2D and all the approximate Riemann solvers from there.
    • Add code for Shepard and MLS-based density corrections.
    • Add kernel corrections proposed by Bonet and Lok (1999)
    • Add corrections from the CRKSPH paper (2017).
    • Add basic equations of Parshikov (2002) and Zhang, Hu, Adams (2017)
  • Bug fixes:
    • Ensure that the order of equations is preserved.
    • Fix bug with dumping VTK files.
    • Fix bug in Adami, Hu, Adams scheme in the continuity equation.
    • Fix mistake in WCSPH scheme for solid bodies.
    • Fix bug with periodicity along the z-axis.

1.0a5

  • Release date: 17th September, 2017
  • Mayavi viewer now supports empty particle arrays.
  • Fix error in scheme chooser which caused problems with default scheme property values.
  • Add starcluster support/documentation so PySPH can be easily used on EC2.
  • Improve the particle array so it automatically ravel's the passed arrays and also accepts constant values without needing an array each time.
  • Add a few new examples.
  • Added 2D and 3D viewers for Jupyter notebooks.
  • Add several new Wendland Quintic kernels.
  • Add option to measure coverage of Cython code.
  • Add EDAC scheme.
  • Move project to github.
  • Improve documentation and reference section.
  • Fix various bugs.
  • Switch to using pytest instead of nosetests.
  • Add a convenient geometry creation module in pysph.tools.geometry
  • Add support to script the viewer with a Python file, see pysph view -h.
  • Add several new NNPS schemes like extended spatial hashing, SFC, oct-trees etc.
  • Improve Mayavi viewer so one can view the velocity vectors and any other vectors.
  • Viewer now has a button to edit the visualization properties easily.
  • Add simple tests for all available kernels. Add SuperGaussian kernel.
  • Add a basic dockerfile for pysph to help with the CI testing.
  • Update build so pysph can be built with a system zoltan installation that is part of trilinos using the USE_TRILINOS environment variable.
  • Wrapping the Zoltan_Comm_Resize function in pyzoltan.

1.0a4

  • Release date: 14th July, 2016.
  • Improve many examples to make it easier to make comparisons.
  • Many equation parameters no longer have defaults to prevent accidental errors from not specifying important parameters.
  • Added support for Scheme classes that manage the generation of equations and solvers. A user simply needs to create the particles and setup a scheme with the appropriate parameters to simulate a problem.
  • Add support to easily handle multiple rigid bodies.
  • Add support to dump HDF5 files if h5py is installed.
  • Add support to directly dump VTK files using either Mayavi or PyVisfile, see pysph dump_vtk
  • Improved the nearest neighbor code, which gives about 30% increase in performance in 3D.
  • Remove the need for the windows_env.bat script on Windows. This is automatically setup internally.
  • Add test that checks if all examples run.
  • Remove unused command line options and add a --max-steps option to allow a user to run a specified number of iterations.
  • Added Ghia et al.'s results for lid-driven-cavity flow for easy comparison.
  • Added some experimental results for the dam break problem.
  • Use argparse instead of optparse as it is deprecated in Python 3.x.
  • Add pysph.tools.automation to facilitate easier automation and reproducibility of PySPH simulations.
  • Add spatial hash and extended spatial hash NNPS algorithms for comparison.
  • Refactor and cleanup the NNPS related code.
  • Add several gas-dynamics examples and the ADEKEScheme.
  • Work with mpi4py_ version 2.0.0 and older versions.
  • Fixed major bug with TVF implementation and add support for 3D simulations with the TVF.
  • Fix bug with uploaded tarballs that breaks pip install pysph on Windows.
  • Fix the viewer UI to continue playing files when refresh is pushed.
  • Fix bugs with the timestep values dumped in the outputs.
  • Fix floating point issues with timesteps, where examples would run a final extremely tiny timestep in order to exactly hit the final time.

1.0a3

  • Release date: 18th August, 2015.
  • Fix bug with output_at_times specification for solver.
  • Put generated sources and extensions into a platform specific directory in ~/.pysph/sources/<platform-specific-dir> to avoid problems with multiple Python versions, operating systems etc.
  • Use locking while creating extension modules to prevent problems when multiple processes generate the same extesion.
  • Improve the Application class so users can subclass it to create examples. The users can also add their own command line arguments and add pre/post step/stage callbacks by creating appropriate methods.
  • Moved examples into the pysph.examples. This makes the examples reusable and easier to run as installation of pysph will also make the examples available. The examples also perform the post-processing to make them completely self-contained.
  • Add support to write compressed output.
  • Add support to set the kernel from the command line.
  • Add a new pysph script that supports view, run, and test sub-commands. The pysph_viewer is now removed, use pysph view instead.
  • Add a simple remeshing tool in pysph.solver.tools.SimpleRemesher.
  • Cleanup the symmetric eigenvalue computing routines used for solid mechanics problems and allow them to be used with OpenMP.
  • The viewer can now view the velocity magnitude (vmag) even if it is not present in the data.
  • Port all examples to use new Application API.
  • Do not display unnecessary compiler warnings when there are no errors but display verbose details when there is an error.

1.0a2

  • Release date: 12th June, 2015
  • Support for tox, this makes it trivial to test PySPH on py26, py27 and py34 (and potentially more if needed).
  • Fix bug in code generator where it is unable to import pysph before it is installed.
  • Support installation via pip by allowing egg_info to be run without cython or numpy.
  • Added Codeship CI build using tox for py27 and py34.
  • CI builds for Python 2.7.x and 3.4.x.
  • Support for Python-3.4.x.
  • Support for Python-2.6.x.

1.0a1

  • Release date: 3rd June, 2015.
  • First public release of the new PySPH code which uses code-generation and is hosted on bitbucket.
  • OpenMP support.
  • MPI support using Zoltan.
  • Automatic code generation from high-level Python code.
  • Support for various multi-step integrators.
  • Added an interpolator utility module that interpolates the particle data onto a desired set of points (or grids).
  • Support for inlets and outlets.
  • Support for basic Gmsh input/output.
  • Plenty of examples for various SPH formulations.
  • Improved documentation.
  • Continuous integration builds on Shippable, Drone.io, and AppVeyor.