HELYX® Hydro

Advanced Volume-of-Fluid (VoF) multiphase flow solver with thermal capabilities.

HELYX-Hydro is a specialised two-phase VoF type solver originally developed by the Council for Scientific and Industrial Research (CSIR) in South Africa. The solver is released by ENGYS under the GNU General Public License as an add-on extension module for our general purpose CFD software product HELYX.


HELYX-Hydro relies on the 2nd order Crank-Nicolson, HiRAC interface capturing scheme to provide a highly accurate representation of the free-surface between immiscible fluid phases. Together with an improved pressure-interpolation scheme, this method has proven to reduce both spurious dissipation and parasitic currents on non-orthogonal grids when compared to the standard multi-dimensional limiter for explicit solution (MULES) algorithm.


The solver package also features thermal capabilities, including heat-mass transfer and liquid film evaporation. Other key features provided with HELYX-Hydro include, but are not limited to:


  • Efficient handling of heterogeneous porous fields
  • Accounting for gas compressibility in the low-Mach number regime
  • Improved coupling algorithm for FSI problems
  • Effective handling of multiple regions

This solver add-on package  is ideal for modeling violent tank sloshing, cryogenic sloshing, microgravity and microfluidics, liquid transport (marine and air) and coastal structures. For further information about this extension module please contact ustoday or speak to one of our local sales representatives.







Related Links


Oxtoby O. and Heyns J.A., "A solver for free-surface flow in heterogeneous porous media", OFW9 2014.


Heyns J.A., Oxtoby O. and Suliman R., "Modelling dynamic liquid-gas systems: Extensions to the volume-of-fluid solver", OFW8 2013.


Heyns J.A., Oxtoby O. and Suliman R., "A finite-volume solver for two-fluid flow in heterogeneous porous media based on OpenFOAM". OSCFD 2013.




Related Videos


HELYX-Hydro experimental validation for violent tank sloshing (courtesy of the CSIR).



Example HELYX-Hydro thermal capabilities. Droplet on heated plate: Leidenfrost phenomenon (test case created by C. Kunkelmann & S. Batzdorf, TTD-TUD).