Solving: iconCFD Solve

4_solvingiconCFD Cold

The iconCFD Cold module allows the user to set up any type of incompressible isothermal flow problem using steady state, pseudo-transient or transient solvers. Its range of applications varies from external aerodynamic flows (automotive, wind turbine, environmental, etc.) to internal flow simulations (ductings, cabin flow, ventilation, etc.).

iconCFD Cold is composed of efficient and scalable pressure-based solvers with support for multiple reference frame (MRF), porous media modeling, fan modeling etc., which have been validated on hundreds of industrial cases.

It has been confirmed by ICON customers to be a cost-effective alternative to closed-source solvers by demonstrating similar or superior accuracy and efficiency combined with the flexibility and economic benefits of open source, scalable calculations.

iconCFD Cold is distributed as open source software.



The iconCFD VOF module enables the execution of pseudo-transient volume of fluid simulation for locating the free surface or interface between two fluids (Newtonian or non-Newtonian). It is then possible for the user to easily track the shape and position of the interface.

Developments of iconCFD VOF have been concentrated on limiting the parasitic interfacial currents, allowing larger time steps, improving accuracy and robustness of the iconInterPisoFoam solver and developing advanced boundary conditions (dynamic / fixed contact angle). The module also supports sloshing simulation (with variation of the gravity vector), rotating frames of reference, and automatic interface refinement with load-balancing.


Setup of iconCFD VOF cases are made easy in iconCFD Process, where initialisation of the phases can be driven via the graphical user interface. The iconCFD VOF module offers a wide range of free surface simulation capabilities, from droplet and porous rock, to nozzle jet simulation.

iconCFD VOF is distributed as open source software.

iconCFD Optimize

iconCFD Optimize offers optimization processes for two main types of problems:

  • Shape optimization (external aerodynamics)
  • Topology optimization (internal flow / duct system)

In both cases the aim is to improve the performance of a given design, commencing with the definition of a goal e.g. the “objective” (often described as a cost function). The goal may be identified but defining the design parameters can be challenging. Adjoint methods solve the problem by identifying the necessary shape changes, either by indicating the surface sensitivities where the design needs to be modified (external aerodynamic case) or by blocking “non-productive” regions of the domain with regards to the objective (cell porosity update).


Cost functions available in iconCFD Optimize include:

  • Lift / drag control
  • Power dissipation
  • Massflow rate
  • Flow uniformity
  • Swirl control

optimised_duct_01The essence of optimization is to find the minimum value of a design objective with regards to one or more design variables. The strength of adjoint optimization resides in the fact that regardless of the number of design variables, the computational cost remains the same compared to traditional methods.

iconCFD Optimize is distributed as open source software.

iconCFD Thermal

The iconCFD Thermal module allows the user to deal with heat transfer problems.


The solvers in this module cover the following range of simulations:

  • Steady state / transient / pseudo-transient
  • Compressible / incompressible
  • Laminar / turbulent
  • Conjugated heat transfer (CHT)

The solvers all support the use of porous zones, thermal zones, MRF zones, porous solids and optional activation of buoyancy and radiation.

iconCFD Thermal is distributed as open source software.

For further information about iconCFD please use this contact form for your enquiries.