Particle-based multiphysics simulations in Julia


Cite this software

What TrixiParticles.jl can do for you


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TrixiParticles.jl is a numerical simulation framework designed for particle-based numerical methods, with an emphasis on multiphysics applications, written in Julia. A primary goal of the framework is to be user-friendly for engineering, science, and educational purposes. In addition to its extensible design and optimized implementation, we prioritize the user experience, including installation, pre- and postprocessing. Its features include:


  • Incompressible Navier-Stokes
    • Methods: Weakly Compressible Smoothed Particle Hydrodynamics (WCSPH), Entropically Damped Artificial Compressibility (EDAC)
  • Solid-body mechanics
    • Methods: Total Lagrangian SPH (TLSPH)
  • Fluid-Structure Interaction
  • Output formats:
    • VTK


We provide several example simulation setups in the examples folder (which can be accessed from Julia via examples_dir()).


If you have not yet installed Julia, please follow the instructions for your operating system. TrixiParticles.jl works with Julia v1.9 and newer. We recommend using the latest stable release of Julia.

For users

TrixiParticles.jl is a registered Julia package. You can install TrixiParticles.jl, OrdinaryDiffEq.jl (used for time integration) and Plots.jl by executing the following commands in the Julia REPL:

julia> using Pkg

julia> Pkg.add(["TrixiParticles", "OrdinaryDiffEq", "Plots"])

For developers

If you plan on editing TrixiParticles.jl itself, you can download TrixiParticles.jl to a local folder and use the code from the cloned directory:

git clone
cd TrixiParticles.jl
mkdir run
julia --project=run -e 'using Pkg; Pkg.develop(PackageSpec(path="."))' # Add TrixiParticles.jl to `run` project
julia --project=run -e 'using Pkg; Pkg.add("OrdinaryDiffEq", "Plots")' # Add additional packages

If you installed TrixiParticles.jl this way, you always have to start Julia with the --project flag set to your run directory, e.g.,

julia --project=run

from the TrixiParticles.jl root directory. Further details can be found in the documentation.


In the Julia REPL, first load the package TrixiParticles.jl.

julia> using TrixiParticles

Then start the simulation by executing

julia> trixi_include(joinpath(examples_dir(), "fluid", "hydrostatic_water_column_2d.jl"))

This will open a new window with a 2D visualization of the final solution:

Further details can be found in the documentation.


You can find the documentation for the latest release here.


Cite Us

If you use TrixiParticles.jl in your own research or write a paper using results obtained with the help of TrixiParticles.jl, please cite it as

  title={{T}rixi{P}articles.jl: {P}article-based multiphysics simulations in {J}ulia},
  author={Erik Faulhaber and Niklas Neher and Sven Berger and
          Michael Schlottke-Lakemper and Gregor Gassner},


Erik Faulhaber (University of Cologne) and Niklas Neher (HLRS) implemented the foundations for TrixiParticles.jl and are principal developers along with Sven Berger (hereon). The project was started by Michael Schlottke-Lakemper (RWTH Aachen University/HLRS) and Gregor Gassner (University of Cologne), who provide scientific direction and technical advice. The full list of contributors can be found in

License and contributing

TrixiParticles.jl is licensed under the MIT license (see Since TrixiParticles.jl is an open-source project, we are very happy to accept contributions from the community. Please refer to for more details. Note that we strive to be a friendly, inclusive open-source community and ask all members of our community to adhere to our To get in touch with the developers, join us on Slack or create an issue.


The project has benefited from funding from hereon and HiRSE.

Logo of TrixiParticles.jl
Programming language
  • Julia 100%
  • MIT
</>Source code

Participating organisations

Helmholtz-Zentrum Hereon
University of Stuttgart