Moving Mesh
The Rotating Machinery, Fluid Flow interfaces rely on ALE (Arbitrary Lagrangian Eulerian) moving mesh functionality for their rotating domain and free surface implementation.
Rotating Domains
When a Rotating Machinery, Fluid Flow interface is added using the Model Wizard, a Rotating Domain node is added automatically in the Model Builder under the Definitions>Moving Mesh node. It contains settings for specifying the rotation of one or several domains. By default, All domains are selected. Under the Rotating Domain, you can exclude any non-rotating fluid domains. For both 3D and 2D components, the Rotation type should be set to Specified rotational velocity.
Select a Rotational velocity expression — General revolutions per time (the default), Constant revolutions per time, General angular velocity, or Constant angular velocity.
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For Constant revolutions per time, or General revolutions per time, enter a value or expression respectively in the Revolutions per time input field and optionally an Initial angle. The angular velocity in this case is defined as the input multiplied by 2·π.
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For Constant angular velocity, or General angular velocity enter a value or an expression respectively in the Angular velocity input field and optionally an Initial angle.
3D Components
For 3D components, select the Rotation axis base point, rax. The default is the origin. Select the Rotation axis, urot, the z-axis is the default. If the x-axis is selected, it corresponds to a rotational axis (1, 0, 0) with the origin as the base point, and correspondingly for the y-axis and z-axis.
2D Components
For 2D components, enter coordinates for the Rotation axis base point, rax. The default is the origin (0, 0).