Including Rotation
This section discusses how to include the effects of rotation in GYRE calculations. See the Rotation Effects section for further details of GYRE’s rotation treatment.
Setting the Rotation Rate
There are two different ways to define the rotation angular frequency
\(\Orot\), via parameters in the &rot namelist group.
If
Omega_rot_source='MODEL', then differential rotation is assumed with a spatially varying \(\Orot\) obtained from the stellar model. If the model doesn’t have this capability (see the Model Capabilities section), then \(\Orot\) is set to zero throughout the star.If
Omega_rot_source='UNIFORM', then uniform rotation is assumed with a spatially constant \(\Orot\) set by theOmega_rotandOmega_rot_unitsparameters.
Incorporating Doppler Effects
The Doppler Shift effect is incorporated automatically
whenever calculations are performed with non-zero \(\Orot\) and
mode azimuthal order \(m\). To disable this effect, set
m= 0 in the &mode namelist group.
Incorporating Coriolis Effects
Incorporating the effects of the Coriolis force can be done using a
perturbative treatment or a
non-perturbative treatment. In the former
case the effects are be applied as a post-calculation correction to
non-rotating eigenfrequencies (see the domega_rot output item
in the Summary Files and Detail Files sections). In the
latter case, the traditional approximation of rotation (TAR) can be
enabled by setting coriolis_method='TAR' in the
&rot namelist group.
The TAR solution family is controlled by the
rossby parameter of the &rot namelist group; set to
.TRUE. for the Rossby family, and to .FALSE. for the
gravito-acoustic family.