OpenFOAM includes a large range of solvers each designed for a specific class of
problem. The equations and algorithms differ from one solver to another so that
the selection of a solver involves the user making some initial choices on the
modelling for their particular case. The choice of solver typically involves scanning
through their descriptions in 3.5 to find the one suitable for the case. It
ultimately determines many of the parameters and physical properties
required to define the case but leaves the user with some modelling options
that can be specified at runtime through the entries in dictionary files in
the constant directory of a case. This chapter deals with many of the
more common models and associated properties that may be specified at
runtime.
