What is passive flow control method used to reduce the drag co-efficient over a cylinder?(a) Surface framing(b) Flow visualization(c) Roughened surfaces(d) Wiring surfacesI have been asked this question at a job interview.My question is taken from Lifting Flow over Cylinder in chapter Inviscid & Incompressible Flow of Aerodynamics

What is passive flow control method used to reduce the drag co-efficie

1.	What is passive flow control method used to reduce the drag co-efficient over a cylinder?(a) Surface framing(b) Flow visualization(c) Roughened surfaces(d) Wiring surfacesI have been asked this question at a job interview.My question is taken from Lifting Flow over Cylinder in chapter Inviscid & Incompressible Flow of Aerodynamics
Answer» Right ANSWER is (c) Roughened surfaces To explain I WOULD SAY: To REDUCE the amount of drag on a CYLINDER various active and passive flow control method have been employed and tested successfully.T hese method include dimpled surfaces, trip wires, roughened surfaces.

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