Solver Options

RfbFoam supports selective equation solving for computational efficiency through command-line flags.

Execution Modes

Mode	Flag	Description
Full simulation	(default)	Solves momentum, mass, and charge transport
Flow only	-onlyU	Solves momentum equations only
Electrochemistry only	-onlyScalar	Solves mass and charge transport only

Full Simulation

RfbFoam

Solves all transport equations (momentum, species, and charge) in a coupled manner.

Flow Only

RfbFoam -onlyU

Solves only the momentum and continuity equations. Use this when you need the velocity and pressure fields without electrochemistry.

Electrochemistry Only

RfbFoam -onlyScalar

Solves only the species concentration and charge transport equations. Requires a pre-computed velocity field. This is the standard approach for generating polarization curves: solve the flow once, then sweep applied potentials using this mode.

Parallel Execution

RfbFoam supports parallel execution using OpenFOAM's domain decomposition. The example cases use scotch decomposition by default, configured in system/decomposeParDict:

# Decompose the domain
decomposePar

# Run in parallel (e.g., 4 processors)
mpirun -np 4 RfbFoam -parallel

# Reconstruct the results
reconstructPar

The provided run scripts (Run_All.sh, Run_U.sh, Run_Scalar.sh) handle decomposition, parallel execution, and reconstruction automatically.