Abstract: Flowmeters utilizing nonstreamlined, bluff bodies and sensors are disclosed for generating oscillating wakes in a fluid flowing through a pipe to produce high signal-to-noise signals which are free from intermittency and are sensed outside of the wake in the flow near and upstream from the bodies. Each of the bodies comprises prescribed geometric configurations and includes a base surface facing the flow and downstream surfaces to control the oscillatory flow. The bodies each have sharp upper and lower corners at the edges of the facing base surface for defining separation lines for the flow. The facing base surfaces are selectively blunt or convex for reducing pressure loss in the pipe due to the bluff body.