The OpenFOAM Foundation is pleased to announce the release of version 11 of the OpenFOAM open source CFD toolbox. Version 11 introduces modular solvers written as classes, in contrast to the traditional application solvers, integral to OpenFOAM since icoFoam in 1993.  Modular solvers are simpler to maintain and extend, and are more flexible for multi-region simulations, e.g. conjugate heat transfer (CHT) with any type of flow, e.g. multiphase. Everything is  backward-compatible, so: 1) application solvers will still compile in OpenFOAM; 2) launching an old application solver, e.g. simpleFoam, executes a script which  runs the incompressibleFluid module on a single region.

OpenFOAM 11 includes the following highlights.

• Modular Solvers: class-based solvers for greater flexibility, e.g. multi-region simulations.
• Multiphase: vastly improved consistency and conservation in the multiphaseEuler module.
• Transport: added anisotropic thermal conductivity.
• Thermophysical: standardised the specification of property names in input file keywords.
• Heat transfer: simplified critical boundary conditions for heat transfer between regions.
• Particle tracking: generalised statistical distributions for size distributions in particles.
• Liquids Films: full replacement which conserves mass and integrates to other models.
• Meshes: redesign of dynamic mesh functionality and consolidated NCC.
• Function Objects: improved field averaging and visualisation function objects.
• Models and Constraints: numerous new models and constraints.
• Boundary Conditions: consolidated mapped conditions and introduced MRF conditions.
• Case Configuration: new foamToC application lists models and options in OpenFOAM.
• Programming: new finite volume functions and improvements to algorithm sequences.