Rotating Shaft
Use the Rotating Shaft node to define boundaries where the fluid is subjected to a solid shaft rotation. This feature should be applied to boundaries outside of, but connecting to, a Rotating Domain. This feature can be applied to rotating shaft boundaries in a free-surface domain modeled by a Deforming Domain.
Rotating Shaft
Axis of Rotation
Select the Axis of rotation. If x-axis is selected, this corresponds to a rotational axis (1, 0, 0) with the origin as the base point. Correspondingly, if y-axis or z-axis is selected, the rotational axis is defined by a unit vector in the selected direction together with a base point at the origin. For User defined enter values into these fields: Rotation axis base point and Rotation axis direction. The z-axis is the default choice and the default values in the fields for User defined correspond to those for the z-axis.
Angular Velocity
Select the rotating shaft Rotational frequency from the list:
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Select the Revolution per time option to manually define the rotational velocity (SI unit: rad/s) and select the Rotational direction as Positive angular velocity or Negative angular velocity. This is the default setting.
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Select the Angular velocity option to manually define the angular velocity (SI unit: rad/s).
Dispersed Phase Boundary Condition
Select an option from the Dispersed phase boundary condition list — No dispersed phase flux (the default), Dispersed phase concentration, Dispersed phase outlet, Dispersed phase flux, or Symmetry.
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For Dispersed phase concentration enter a Dispersed phase volume fraction ϕd0 (dimensionless). The default is 0. When Solve for interfacial area is selected under the Physical Model section, select either the Dispersed phase number density n0 (SI unit: 1/m3) or Diameter of particles/droplets dd (SI unit: m) button and enter a value or expression for n0 (the default is 5·106 1/m3) or dd (the default is 1 mm).
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For Dispersed phase flux enter values or expression for the Dispersed phase flux Nϕd (SI unit: m/s) and, if Solve for interfacial area is selected under the Physical Model section, the Number density flux Νn (SI unit: 1/(m2⋅s)). The defaults are 0 m/s and 0 1/(m2⋅s), respectively.
Dispersed Phase Boundary Condition Equations in the CFD Module User’s Guide