An apparatus comprising: a rotor group that is rotatable within the apparatus; a bearing assembly that supports the rotor group; a support structure that supports the bearing assembly and that is fixed in the apparatus, wherein the support structure includes: a support housing; an anisotropic support comprising at least two rings (34, 36) connected by asymmetrically-arranged beams and engaging the bearing assembly and the support housing; and a squeeze film cavity defined between the anisotropic support and the support housing; a damper fluid supply line in fluid communication with the squeeze film cavity for independently providing a fluid to the squeeze film cavity; a fluid reservoir in fluid communication with the damper fluid supply line for providing the fluid to the damper fluid supply line; characterised in that the apparatus further comprises a main supply line disposed between and in fluid communication with the fluid reservoir and the damper fluid supply line, and wherein the damper fluid supply line is split from the main supply line; a bearing fluid supply line further split from the main supply line for independently providing the fluid to the bearing assembly; and a fluid interruption device disposed in the damper fluid supply line and controlled by an engine control system for interrupting a fluid flow to the squeeze film cavity, wherein a fluid flow to the bearing assembly is uninterrupted when the fluid flow to the squeeze film cavity is interrupted by the fluid interruption device. a rotor group that is rotatable within the apparatus; a bearing assembly that supports the rotor group; a support structure that supports the bearing assembly and that is fixed in the apparatus, wherein the support structure includes: a support housing; an anisotropic support comprising at least two rings (34, 36) connected by asymmetrically-arranged beams and engaging the bearing assembly and the support housing; and a squeeze film cavity defined between the anisotropic support and the support housing; a support housing; an anisotropic support comprising at least two rings (34, 36) connected by asymmetrically-arranged beams and engaging the bearing assembly and the support housing; and a squeeze film cavity defined between the anisotropic support and the support housing; a damper fluid supply line in fluid communication with the squeeze film cavity for independently providing a fluid to the squeeze film cavity; a fluid reservoir in fluid communication with the damper fluid supply line for providing the fluid to the damper fluid supply line; characterised in that the apparatus further comprises a main supply line disposed between and in fluid communication with the fluid reservoir and the damper fluid supply line, and wherein the damper fluid supply line is split from the main supply line; a bearing fluid supply line further split from the main supply line for independently providing the fluid to the bearing assembly; and a fluid interruption device disposed in the damper fluid supply line and controlled by an engine control system for interrupting a fluid flow to the squeeze film cavity, wherein a fluid flow to the bearing assembly is uninterrupted when the fluid flow to the squeeze film cavity is interrupted by the fluid interruption device.