Simulation and Analysis of Fluid Flow

HELYX® is a professional CFD toolbox based around the Open Source CFD framework OpenFOAM®. We take advantage of the many benefits of Open Source to offer a fully supported professional CFD solution for industry without the complex license restrictions often imposed by other vendors.


A significantly enhanced OpenFOAM® software release and regular updates, including a wide range of physical modelling components developed by Engys to bring CFD simulation capabilities in OpenFOAM® more in line with industry accepted norms.

What do you get?


The HELYX suite incorporates as standard the following software components for Linux and Windows platforms:

  • HELYX-GUI: our easy-to-use Graphical User Interface.
  • HELYX-Core: our enhanced version of the open-source CFD library OpenFOAM®.


The open modular nature of HELYX® enables the collaboration with other experts around the world to bring additional solver capabilities through the addition of Extension Modules. Some examples of specialized solvers available in HELYX® as extra modules include: fully coupled solvers, Adjoint CFD optimization, fast ship-hull hydrodynamic analysis, VOF waves modelling, etc.

The HELYX® GUI is developed to drastically reduce the OpenFOAM learning curve. Using HELYX®, the engineer is able to intuitively setup cases without manual file manipulation. Compared to standard OpenFOAM, HELYX CFD is delivered with a state-of-the-art automatic and improved mesh generator.

All modifications and additions to the code are GPL and remain open-source for the benefit of the end-user.


Services included


HELYX also incorporates an extensive set of support services to facilitate the deployment and usage of the tool in the working environment, including:

  • First-class Support: help line for technical questions and installation queries
  • Code Maintenance: dealing with all bugs and regular software updates in both HELYX-GUI and HELYX-Core
  • HELYX-Documentation: comprehensive written user manual and tutorial guide
more info

Software Capabilities

in-helyx-textThe main current capabilities in HELYX-GUI include:

  • Create new cases or load existing cases directly from available project files (manual changes to dictionary files are loaded back into the GUI).
  • Mesh module: control the HELYX-Mesh utility for mesh definition and execution, import and export grids from/to third-party software.
  • Case setup module: define physical models, material properties, boundary conditions, solver settings, rotating regions, porous regions, thermal regions, etc.
  • Solver module: control solver execution within the GUI, monitor residuals and other quantities.


Engys enhancements to the OpenFOAM® library available as part of HELYX-Core comprise, but are not limited to:



Linux and Windows binaries for simple out-of-the-box installation



Enhanced helyxHexMesh utility:

  • Improved parallel efficiency
  • Automatic feature edges capturing
  • Improved robustness and element quality
  • Improved near-wall layer addition controls
  • Automatic crack detection and wrapping functionality for CAD healing


Case Setup

Custom caseSetup utility:

  • Single dictionary interface for defining solution approach, turbulence, thermophysical properties, flow initialisation, boundary conditions
  • Parallel execution
  • Fully customisable



Validated across multiple application fields (e.g. aerodynamics, HVAC, turbomachinery, multi-phase flows, aeroacoustics, hydrodynamics, etc)

  • Improved solution speed and robustness
  • Infiniband support
  • Extended physical modelling (e.g. thermal radiation, solar radiation, passive scalar transport, etc)
  • New and improved turbulence models and wall functions (e.g. Kader)
  • Over 50 new and improved boundary conditions
  • Parallel mapping of solution fields between different meshes


Function Objects

Over 20 new and improved function objects for execution at run-time



Improved solution monitoring and post-processing, e.g. extended function object for analysing aerodynamic forces, human comfort assessment, etc

  • Precompiled ParaView with native case reader

What can Dynaflow offer you?

Dynaflow Research Group and Engys Ltd has formed a strategic alliance to focus on the Oil & Gas industry worldwide, seeking to promote and deliver CAE products and services built around Open Source technologies. Dynaflow has extensive expertise in all aspects of design and analysis of petro-chemical applications that will lead to the definition and development of new advanced simulation tools powered by HELYX, Engys’ own CFD product and support service based on the Open Source library OpenFOAM.


The engineers at Dynaflow have years of experience in the usage and development of CFD and OpenFOAM® and will provide you with first line support, code development and consulting queries. Dynaflow can assist you with the following:

  • CFD consulting services
  • OpenFOAM code development
  • First line HELYX support
  • Comparing OpenFOAM results with commercial packages such as Fluent, Ansys or Comsol
  • Assisting you to setup an OpenFOAM/HELYX environment on your machines
  • Training (using our dedicated facilities or onsite)