This tutorial model illustrates how one can couple the OpenFOAM CFD solver with the FEATool Multiphysics FEA solver. In the model a stream of cool air is heated while flowing through a tube and fin heat exchanger. Due to several symmetry planes only a small section of the full heat exchanger geometry actually needs to be simulated, as illustrated in the following image.

The model demonstrates the multi-solver simulation process by first solving for the flow field using the OpenFOAM solver.

After which the temperature field is solved for with the built-in FEATool Multiphysics solver, using the pre-computed flow field as a constant input to the heat equation.

- Solve flow field with OpenFOAM

- Use the pre-computed velocity field as constant input and solve for the temperature using the built-in multiphysics solver

This two step solution process for a one-way coupled model allows significant savings in computational time and resources, by separating the equations and physics problems, and use the best and most efficient solver for each individual sub-problem.

Although here, the OpenFOAM and built-in solvers are used to demonstrate the multi-simulation process. Other combinations of solvers can also be used such as the FEniCS multiphysics and SU2 solvers.

This model is available as an automated tutorial by selecting **Model
Examples and Tutorials…** > **Multiphysics** > **Multi-Simulation
Heat Exchanger** from the **File** menu. Or alternatively, follow the
video tutorial or step-by-step instructions linked below.