Engine components with cooling holes having tailored metering and diffuser portions

A turbine section of a gas turbine engine, comprising:

• a housing defining a hot gas flow path;
• a plurality of circumferential rows of airfoils disposed in the hot gas flow path, each airfoil defining an inner surface and an outer surface;
• and
• a plurality of cooling holes arranged within at least one of the plurality of circumferential rows of airfoils and configured to receive a cooling fluid flow, wherein a first cooling hole of the plurality of cooling holes is defined by:
• a metering portion extending from an inlet on the internal surface to a diffuser portion, the inlet configured to receive the cooling fluid flow and the metering portion to define a center flow zone, the metering portion extending along a longitudinal centerline;
• and
• the diffuser portion extending from the metering portion to the outer surface of the airfoil and defining an outlet at the outer surface, the diffuser portion to receive the cooling fluid flow from the metering portion, the diffuser portion having a diffuser portion top surface, a diffuser portion bottom surface, and diffuser portion sides that join the diffuser portion top surface to the diffuser portion bottom surface, the diffuser portion top surface including a diffuser central concave section downstream from a diffuser first convex section and a diffuser second convex section at the outlet, the diffuser portion bottom surface including a diffuser third convex section and a diffuser fourth convex section downstream from a diffuser central convex section at the outlet, the diffuser first convex section connected to the diffuser third convex section by one of the diffuser portion sides and the diffuser second convex section connected to the diffuser fourth convex section by another of the diffuser portion sides, the diffuser portion including a second maximum height defined between the diffuser first convex section and the diffuser third convex section, a central height defined between the diffuser central concave section and the diffuser central convex section, the central height less than the second maximum height, the diffuser portion extends along an axis oblique to the longitudinal centerline and the second maximum height is offset from the axis, and the diffuser portion top surface is inclined at a forward angle relative to the metering portion such that the diffuser central concave section of the diffuser portion top surface extends into the center flow zone to direct the cooling fluid flow from the center flow zone toward the diffuser portion sides.