The market leading open-source GUI for OpenFOAM®

HELYX-OS is an open-source Graphical User Interface designed to work natively with the OpenFOAM libraries. The GUI is developed by ENGYS using Java+VTK and delivered to the public under the GNU General Public License.


HELYX-OS has been created to facilitate the usage of OpenFOAM by removing the complexity of the standard text based case definition in favour of an intuitive and easy-to-use graphical user interface. The GUI is focused on pre-processing tasks, including meshing, case definition and solver execution.


The main features of HELYX-OS are:


  • Native support for both OpenFOAM and OpenFOAM+ (load existing cases by reading settings directly from the available project text files).
  • Linux and Windows platforms (n.b. Windows version available to paid support customers only).
  • One file installation.
  • Create and run new CFD cases from scratch in serial or parallel.
  • Control snappyHexMesh, including geometry display and execution within the GUI.
  • Comprehensive case definition module, including controls for physical models, turbulence, boundary conditions, field initialisation and solver execution within the GUI.
  • Solver execution tab with solution residuals monitoring.
  • Cloud computing interface for execution of OpenFOAM via the HELYX-OS Cloud connection powered by Parallel.Works.

The following solvers are supported at present within the GUI:


  • Incompressible flows: simpleFoam, pimpleFoam and pisoFoam with support for MRF and porous media modelling via fvOptions
  • Compressible flows (low Ma): rhoSimpleFoam and rhoPimpleFoam with support for MRF and porous media modelling via fvOptions
  • Compressible flows (high Ma): sonicFoam
  • Heat transfer and buoyancy-driven flows: buoyantSimpleFoam, buoyantPimpleFoam, buoyantBoussinesqSimpleFoam and buoyantBoussinesqPimpleFoam with support for MRF and porous media modelling via fvOptions
  • VOF free-surface multi-phase flows: interFoam
  • Dynamic mesh: pimpleDyMFoam, rhoPimpleDyMFoam, interDyMFoam

The source code, binaries and installation instructions for Linux platforms are all available free of charge from our project page in GitHub without formal user support or documentation.


If you require technical support and/or training for HELYX-OS and OpenFOAM please contact us or visit our CFD Support and CFD Training pages for more information. Alternatively, we recommend you consider our enterprise-class open-source based CFD product HELYX for industrial type applications.

HelyxOS Opensource Native GUI







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HELYX-OS Mesh Interface



HELYX-OS Case Setup Interface



HELYX-OS Solver Interface