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Fifth International Symposium on Turbulence and Shear Flow Phenomena
August, 27-29, 2007, Technische Universität München, Munich, Germany

DOI: 10.1615/TSFP5

WELL-CONTROLLABLE TURBULENCE GENERATOR USING A BIAXIALLY ROTATING SPHERE

pages 247-252
DOI: 10.1615/TSFP5.370
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ABSTRACT

We propose a tabletop turbulence generator using a biaxially rotating (i.e. precessing) sphere. The flow inside the sphere is governed by two well-controllable parameters related with the spin and the precession angular velocities. The time-series analysis of PIV data for the velocity field reveals that turbulence is sustained even with a weak precession as far as the spin is sufficiently fast. We show the three-dimensional spatial flow structures obtained by the direct numerical simulations at the precisely same conditions as laboratory experiments.

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