interMixingFoam - OpenFOAM Solver

Solver: interMixingFoam   Description

interMixingFoam is a solver specifically designed for transient simulations involving three incompressible, isothermal fluids, with two of them being miscible. It accommodates both laminar and turbulent flows, handling a range of fluids, including both Newtonian and non-Newtonian ones. It utilizes the Volume of Fluid (VoF) approach for capturing the interface between the fluids accurately. The solver is suited to cases where the particular interest is in the behavior of the interface between two fluids (e.g. water and air). Therefore, it extends the capabilities of interFoam solver. This solver is ideal for analyzing the mixing of two fluids in open tanks, and it is commonly utilized for analyzing the mixture of two phases, while omitting the presence of a third immiscible phase.

The solver uses the PIMPLE (merged PISO-SIMPLE) algorithm for pressure-momentum coupling. This algorithm leverages the strengths of both PISO and SIMPLE methods for pressure-velocity coupling, ensuring robustness in handling transient flows with large time steps. This approach is supplemented by under-relaxation techniques to secure convergence stability. It supports Multiple Reference Frame (MRF) and porosity modeling and allows easy integration of passive scalar transport equations and source terms. The solver handles dynamic meshes.

It is applicable for scenarios where three fluids are considered. The example can be environmental flows and silt water flow in rivers. In the chemistry industry, it can be applied for stirring processes and open mixing tanks.

Solver: interMixingFoam   Features

  • Transient
  • Incompressible
  • Multiphase - Volume of Fluid (VoF)
  • 3 Fluids (2 Miscible and 1 Immiscible)
  • Mixing
  • Dynamic Mesh Motion
  • Laminar and Turbulent (RANS, LES, DES)
  • Multicomponent (mixture)
  • Newtonian and Non-Newtonian Fluid
  • Pressure-Based Solver
  • Rotating Objects:
    • Multiple Reference Frames (MRF)
    • Rotating Mesh Motion
  • Passive Scalar
  • Porosity Modeling
  • Buoyancy
  • Source Term (explicit/implicit)
  • PIMPLE Algorithm
  • MULES Algorithm
  • Solution Limiters:
    • Velocity Damping

Solver: interMixingFoam   Application


  • Silt Water in a River


  • Stirring Processes including Two Miscible Fluids
  • Open Mixing Tanks


  • Mixing of Fuel Components in Engine

Solver: interMixingFoam   Multiphase - Free Surface (VoF) Solvers Comparison

Free Surface (VoF) Solvers In this group, we have included solvers implementing Volume of Fluid (VoF) approach to handle multiple immiscible and miscible fluids and interactions between them.

Free Surface (VoF) - Immiscible

Free Surface (VoF) - Miscible

  • * isoAdvector - an alternative approach for interface capturing, MULES method used in other VoF solvers
  • ** Solver designed to handle mixtures consisting of multiple fluids within the same phase, such as two gases or two liquids
  • VoF - Volume of Fluid
  • DyM - Dynamic Mesh
  • Overset - also known as Chimera Grid (Method)