Fluid ducts including a rib

A gas turbine engine, comprising:

• a compressor section;
• a turbine section;
• and
• a fluid duct fluidly coupled between the compressor section and the turbine section, the fluid duct comprising:
• a body extending along a central axis and defining a lumen configured to receive a first fluid extending therethrough, the body having an inner surface and an outer surface, wherein the central axis defines an axial direction along the central axis, a radial direction perpendicular to the central axis, and a circumferential direction oriented rotationally about the central axis;
• and
• a plurality of ribs positioned on the inner surface of the body and extending radially inward from the inner surface of the body, each of the plurality of ribs defining a channel extending therethrough in a primary direction, wherein the channel is configured to receive a second fluid and isolate the second fluid from the first fluid.

A fluid duct, comprising:

• a body extending along a central axis and defining a lumen extending therethrough, the body having an inner surface and an outer surface, wherein the central axis defines an axial direction along the central axis, a radial direction perpendicular to the central axis, and a circumferential direction oriented rotationally about the central axis, wherein a wall thickness of the body is less than 50 mils;
• and
• a plurality of ribs integrally formed with the body and extending radially inward from the inner surface of the body, wherein the plurality of ribs extends fully about the inner surface of the body in the circumferential direction, wherein each of the plurality of ribs comprises:
• a radial rib thickness of less than 100 mils;
• and
• an axial rib width of less than 100 mils,
• wherein at least one rib of the plurality of ribs is positioned at a maximum vibration deflection location of the body, wherein at least one rib of the plurality of ribs is positioned at a maximum thermal stress location of the body.