# Including Rotation¶

GYRE can partially include the Doppler and Coriolis effects arising from stellar rotation, as described in detail in the Rotation Effects section. Here, we briefly review the parameters that influence how these effects are calculated.

## Setting the Rotation Rate¶

There are a number of different ways to define the rotation angular
velocity \(\Omega\), via parameters in the `&rot`

namelist
group.

- If
`Omega_rot_source`

=`MODEL`

, then \(\Omega\) is obtained from the stellar model (for those model formats that include these data) - If
`Omega_rot_source`

=`UNIFORM`

, then uniform rotation is assumed, with the spatially constant \(\Omega\) set by the`Omega_rot`

and`Omega_rot_units`

parameters

## Enabling Doppler Effects¶

Doppler effects are enabled by default whenever calculations are
performed with non-zero \(\Omega\) and mode azimuthal order
\(m\). To disable these effects, set `m`

= `0`

in
the `&mode`

namelist group.

## Enabling Coriolis Effects¶

Coriolis effects are disabled by default, but can be enabled using the
traditional approximation of rotation (TAR) by setting
`coriolis_method`

=`'TAR'`

in the `&rot`

namelist group. The solution family is controlled by the
`rossby`

parameter of the `&rot`

namelist group; set to
`.TRUE.`

for the Rossby family, and to `.FALSE.`

(the
default) for the gravito-acoustic family.