In the Squeeze-Film Damper node, you specify the geometric dimensions, as well as journal and lubricant properties necessary to model a squeeze-film damper.

Enter the value of the Clearance, C.

Select Specify — Displacement or Eccentricity and direction. Then, go to the relevant section below to continue defining the properties.

If Displacement is selected, select Journal displacement — User defined and enter the displacement values.

If Eccentricity and direction is selected, enter values for the Eccentricity, e, and the Attitude angle relative to local y direction, ϕy.

Select Velocity of the journal — Whirl speed or Velocity field. In the Whirl speed case, select User defined, and enter the whirl speed value. This speed is the angular speed for the circular orbital motion of the journal.

When the journal motion is not circular, velocity of the journal can be defined as a velocity field. In the Velocity field case, select User defined, and enter the velocity field of the journal.

This section is only available when Fluid type is Liquid (Reynolds equation) in the Physical Model section.

Select the Film type — Sommerfeld or Gümbel. In the Sommerfeld case, a complete 2π film is considered in the net force calculation in the bearing. In the Gümbel case, only half of the film where the pressure is positive (π film) is used for computing the net force in the bearing.

Squeeze-film dampers themselves are not capable of supporting any static load. Centering springs are provided in the dampers to support the static load. Enter the values of Spring constant, kcs, and Damping constant, ccs, of the centering spring.

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.

If Gas (modified Reynolds equation) is being solved, the density is determined automatically by the ideal gas law.

If Liquid with cavitation is being solved, the density is assumed to take the form ρ = ρc exp(βpf), where pf is the fluid pressure, ρc is the density at the cavitation pressure, and β is the compressibility. In this case, enter the values for the Density at cavitation pressure, ρc, and the Compressibility, β.

Select Film flow model — No-slip walls or Slip at walls. In the Slip at walls case, enter the values of Slip length, journal, Lsj, and Slip length, bearing, Lsb.