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REYNOLDS NUMBER DEPENDENCIES IN CLASSICAL GRID TURBULENCE

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We measured inertial and dissipation range statistics in the decaying turbulence generated by a bi-planar grid of crossed bars in a wind tunnel. We did so at Taylor Reynolds numbers between 60 and 1700, reaching higher than any previous experimental study of homogeneous and isotropic turbulence. The measurements were made in the Variable Density Turbulence Tunnel (VDTT) at the Max Planck Institute in Göttingen with both traditional hot-wire anemometers and nano-fabricated NSTAP anemometers developed at Princeton University. The data confirm that even when the large-scale conditions are controlled as the Reynolds number is raised, scaling ranges are not well-defined unless Extended Self-Similarity is employed. We also find a universal transition between the inertial and the near-dissipation ranges.

Author(s):

Michael Sinhuber    
Max Planck Institute for Dynamics and Self-Organization
Germany

Gregory P. Bewley    
Max Planck Institute for Dynamics and Self-Organization
Germany

Bodenschatz Eberhard    
Max Planck Institute for Dynamics and Self-Organization
Germany

Margit Vallikivi    
Princeton University
United States

Marcus Hultmark    
Princeton University
United States

Alexander Smits    
Princeton University
United States