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Updated: Dec 4, 2025

Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
Published on: February 22, 2018
Generation of Atmospheric Turbulence with Unprecedentedly Large Reynolds Number in a Wind Tunnel
Lars Neuhaus1, Michael Hölling1, Wouter J T Bos2
1Institute of Physics and ForWind, University of Oldenburg, 26129 Oldenburg, Germany.
Abstract:
Generating laboratory flows resembling atmospheric turbulence is of prime importance to study the effect of wind fluctuations on objects such as buildings, vehicles, or wind turbines. A novel driving of an active grid following a stochastic process is used to generate velocity fluctuations with correlation lengths, and, thus, integral scales, much larger than the transverse dimension of the wind tunnel. The combined action of the active grid and a modulation of the fan speed allows one to generate a flow characterized by a four-decade inertial range and an integral scale Reynolds number of 2×10^{7}.
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