Hydraulic structure fairing with vortex generator

A method for making a convex-concave fairing for a hydraulic structure whose nose and tail sections and dogleg shape prevents the formation of scouring vortices for large river inflow angle of attack of flow passing said hydraulic structure, the method comprising the steps of:

• selecting, in accord with computational fluid dynamics and water flume river bed scour studies, a suitable piece-wise continuous streamlined fairing whose nose and tail sections are aligned with the on-coming flow direction, and installing said fairing around a perimeter of said hydraulic structure and extending from a height above said river on said structure to a bed of said river surrounding said structure, said piece-wise continuous fairing completely enveloping said perimeter of said structure and providing a piece-wise continuous faired shape to said hydraulic structure in a direction of flow of said river, wherein the piece-wise continuous streamlined fairing comprises a plurality of continuous surfaces that are assembled together to form the piece-wise continuous streamlined fairing surface, and wherein the discontinuity in the piece-wise continuous streamlined fairing surface occurs at the intersection of the plurality of the continuous surfaces;
• attaching vortex generators to surfaces of said piece-wise continuous fairing downstream from a forward upstream portion of the piece-wise continuous streamlined fairing and along a longitudinal distance of a stem to stern dimension of said piece-wise continuous fairing, and being proximal to said river bed in a flow region void of adverse pressure gradients that would persist downstream of said vortex generator for at least one length of said generator, so as to energize a near wall portion of the flow of river current with higher momentum outer layer flow to induce steady, compact separation and wake and thereby oppose formation of scouring vortices within said river flow around said fairing.