coriolis

Mapdl.coriolis(option='', refframe='', rotdamp='', rotmass='', **kwargs)

Applies the Coriolis effect to a rotating structure.

APDL Command: CORIOLIS

Parameters:

optionstr, bool, optional

Flag to activate or deactivate the Coriolis effect:

"ON", "YES", or True - Activate. This value is the default.

"OFF", "NO", or False - Deactivate.

refframestr, bool, optional

Flag to activate or deactivate a stationary reference frame.

"ON", "YES", or True - Activate.

"OFF", "NO", or False - Deactivate. This value is the default.

rotdampstr, bool, optional

Flag to activate or deactivate rotating damping effect.

"ON", "YES", or True - Activate.

"OFF", "NO", or False - Deactivate. This value is the default.

rotmassstr, bool, optional

Flag to activate or deactivate rotor mass summary printout (only supported for refframe='on').

"ON", "YES", or True - Activate.

"OFF", "NO", or False - Deactivate. This value is the default.

Notes

The CORIOLIS command is used for analyses in either a rotating or a stationary reference frame, and performs differently according to the designated RefFrame value. Specific restrictions and elements apply to each case, as follows:

ROTATING REFERENCE FRAME refframe=False):

The command applies the Coriolis effect in the following structural element types: MASS21, SHELL181, PLANE182, PLANE183, SOLID185, SOLID186, SOLID187, BEAM188, BEAM189, SOLSH190, SHELL281, PIPE288 and PIPE289. It also applies this effect in the PLANE223, SOLID226, and SOLID227 analyses with structural degrees of freedom.

In a rotating reference frame, both the Coriolis and spin-softening effects contribute to the gyroscopic moment. Therefore, ANSYS applies spin-softening by default for dynamic analyses. If a rotational velocity is specified (OMEGA or CMOMEGA), centrifugal forces will be included.

To include Coriolis effects in a large deflection prestressed analysis, follow the procedure for linear perturbation detailed in Considerations for Rotating Structures. In a nonlinear transient analysis (ANTYPE,TRANS and NLGEOM, ON), any spinning motion applied through either the IC of the D commands will include the Coriolis effect without having to issue the CORIOLIS command. Refer to Rotating Structure Analysis in the Advanced Analysis Guide for more information.

STATIONARY REFERENCE FRAME refframe=True):

The command activates the gyroscopic damping matrix in the following structural elements: MASS21, BEAM188, SHELL181, BEAM189, SOLID185, SOLID186, SOLID187, SOLID272, SOLID273, SHELL281, PIPE288, PIPE289, and MATRIX50.

The rotating structure must be axisymmetric about the axis of rotation.

Static analysis (ANTYPE, STATIC) does not support Coriolis effects with a stationary reference frame. However, you can include the gyroscopic effects in a prestresses analysis follow the procedure detailed in Considerations for Rotating Structures.

Rotating damping effect (RotDamp = ON) applies only for the stationary reference frame. Therefore, this effect is supported only by the elements listed above that generate a gyroscopic damping matrix. Proportional damping must be present in the element (MP,BETD or BETAD). It is also supported by element COMBI214 with non zero and axisymmetric damping characteristics (non zero real constants C11=C22 and C21=C12=0).

For more information about using the CORIOLIS command, see Rotating Structure Analysis in the Advanced Analysis Guide and also in the Rotordynamic Analysis Guide. For details about the Coriolis and gyroscopic effect element formulations, see the Mechanical APDL Theory Reference.

Elements with layered section properties do not support Coriolis effects (rotating and stationary reference frames).

This command is also valid in PREP7.

Examples

Enable the coriolis effect with a stationary reference frame.

>>> mapdl.coriolis('ON', refframe='ON')

Alternatively, coriolis supports bool parameters.

>>> mapdl.coriolis(True, refframe=True)