Abstract
The force field around a circular cylinder (D = 5.1 cm) towed at U = 0.15 m/s was explored by measuring the lift Fℓ and drag Fd of a small (cylindrical) probe inserted at various locations near the cylinder. By taking the Fourier transform of the lift Fℓ the force component a(f0) that fluctuates in the transverse direction at the circular cylinder's vortex frequency f0 was isolated. This signature of vortex shedding could be detected in a "forefield" that stretches cylinder diameter upstream and to the side of the main cylinder. At all points in the forefield the oscillating force component opposite to the lift FL(t) of the main cylinder. In downstream direction the phase difference between a(f0) and FL grows steadily, implying a phase velocity of v ≈ 0.8U.
Published Version
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