Shaped cavity at interface between journal bearing and rotor

An apparatus for a turbine engine, comprising:

• a journal bearing extending axially along and circumferentially about an axis;
• a rotor mounted on the journal bearing and rotatable about the axis;
• and
• a cavity formed by and extending radially between the journal bearing and the rotor, the cavity extending longitudinally between a first end and a second end, the cavity extending axially between a first side and a second side, and an axial distance between the first side and the second side changing as the cavity extends longitudinally between the first end and the second end.

An apparatus for a turbine engine, comprising:

• a journal bearing extending axially along and circumferentially about an axis;
• a rotor mounted on the journal bearing and rotatable about the axis;
• and
• a cavity formed by and extending radially between the journal bearing and the rotor, the cavity extending longitudinally between a first end and a second end, the cavity extending axially between a first side and a second side, and at least one of the first side or the second side configured with a non-straight geometry when viewed in a plane tangent to a cylindrical surface forming a side of the cavity.