Add a Liquid Annular Seal node to model the effective stiffness, damping, and mass due to the flow in seals.

If the feature is added to a Solid Rotor, or Solid Rotor, Fixed Frame interface, enter the Bearing orientation vector defining the local x direction.

If the feature is added to a Beam Rotor interface, enter the Orientation vector defining the local y direction. The direction given will be adjusted so that it is orthogonal to the rotor axis. The default value is the global y-axis

You can further modify the y-axis orientation by entering an angle for the Rotation of the orientation vector around seal axis. The direction inferred from the previous setting will be rotated counterclockwise around the rotor axis.

Select between Black and Jenssen and Childs model to model the seal dynamic properties. The Black and Jenssen model does not account for inlet swirl in the flow but is valid for finite length seals. The Childs model accounts for the inlet swirl in the flow but is valid only for short seals.

Enter the values of Radial distance, R, Seal length, Ls, and Seal clearance, C.

The default Dynamic viscosity μ is taken From material. For User defined, enter a different value or expression.

With the default options, the Density ρ is taken From material. For User defined enter a different value or expression.

Enter values for Pressure difference, ΔP, Initial flow velocity, V0, Entrance loss coefficient, ξ. Seals require nonzero values for the angular speed of the rotor and the initial flow velocity.

For the Childs model, also enter a value for the Inlet swirl ratio, α. A default value 0.5 corresponds to swirl speed equal to the half of the rotor angular speed.

Physics tab with Solid Rotor selected:

Physics tab with Solid Rotor, Fixed Frame selected:

Physics tab with Beam Rotor selected: