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Alignment Trends of a Decomposed SGS Stress Tensor Determined From Holographic PIV Measurements

[+] Author Affiliations
Bo Tao

Purdue University, West Lafayette, IN

Joseph Katz, Charles Meneveau

Johns Hopkins University, Baltimore, MD

Paper No. FEDSM2002-31261, pp. 545-551; 7 pages
doi:10.1115/FEDSM2002-31261
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

Based on the holographic PIV measurements in the core region of a square duct at ReH ≈ 1.2×105 , the tensorial alignment of the deviatoric subgrid-scale (SGS) stress (τij ) is shown to have a bi-modal behavior (Tao et al., 2001, 2002). To gain further insight into the statistical geometry of τij , we employ the Germano decomposition, τij = Lij + Cij + Rij (Leonard, 1974; Germano, 1986), and compute the decomposed stress elements directly from the velocity data. Their alignment trends are then investigated using joint probability density functions (pdf), similar to those in Tao et al. (2002). The alignment between the Leonard stress, Lij , and the filtered strain-rate (S̃ij ) is found to exhibit a similar bi-modal trend, but the alignment angle between the corresponding eigenvectors is around 40° instead of 32°. The alignment between the SGS Reynolds stress, Rij and S̃ij , on the other hand, is found to be consistent with an eddy viscosity configuration. In contrast, the alignment between the cross stress, Cij , and S̃ij is more complicated and does not exhibit any significant trend. Furthermore, previously reported alignment trends of the vorticity vector, ω̃i , relative to τij , are primarily due to the contribution from Lij . The orientation of ω̃i relative to Cij shows less robust alignment trends, and there is no clear trend in the alignment of ω̃i relative to Rij .

Copyright © 2002 by ASME

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