The open source CFD toolbox
Finite volume options

# Introduction

OpenFOAM solver applications typically include core functionality such as turbulence modelling, heat transfer, and buoyancy effects.

Further flexibility is offered via fvOptions—a collection of run-time selectable finite volume options to manipulate systems of equations by adding sources/sinks, imposing constraints and applying corrections.

These are specified in the fvOptions file located in the $FOAM_CASE/system or$FOAM_CASE/constant directories.

# Usage

## Selecting the region

The majority of options are applied to collections of mesh cells. These can be selected according to the entry selectionMode, e.g.

selectionMode       all;


Valid selectionMode entries include:

• all: all cells
• cellZone: cells defined by a cell zone. This requires an additional entry to specify the name of the cell zone, e.g.
selectionMode       cellZone;
cellZone            myCellZone;


where myCellZone is the name of the cell zone

• cellSet: cells defined by a cell set. This requires an additional entry to specify the name of the cell set, e.g.
selectionMode       cellSet;
cellSet             myCellSet;


where myCellSet is the name of the cell set.

• points: a list of points. This requires an additional entry to list the points, e.g.
selectionMode       points;
points              ((0 0 0) (1 1 1) (2 2 2));


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