High reynolds-number assessment of a multifractal subgrid-scale model

Gregory C. Burton, Werner Dahm, David R. Dowling, Kenneth G. Powell

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We report further results from our a priori assessment of a multifractal subgrid-scale model for large-eddy simulation. In this paper, we compare the model's ability to recover components of the subgrid-stress tensor T*ij and the subgrid energy-production V* field in low and high Reynolds-number turbulence, (Reλ ~ 160 and Reλ ~ 2550). We find that in comparisons with DNS data, the model recovers T*ij with correlations of p ~ 0.855 and p ~ 0.635 in the lower and higher-Re cases, respectively. We also report correlations between DNS and model values for the SGS energy-production field V* of p ~ 0.860 in the lower Reynolds-number context and p ~ 0.804, in the more turbulent flow. We further examine the model's ability to recover components of the averaged subgrid-velocity field usgs, which shows correlations of p ~ 0.915. We also analyze the individual terms within the decomposition of T*ij itself. These tests in sum indicate that the present multifractal model recovers significant structural characteristics of the subgrid field. The comparisons also suggest possible higher-order refinements to the model. Finally, we set forth in some detail a multifractal model for the Reynolds stresses in the Reynolds-Averaged Navier-Stokes equations.

Original languageEnglish (US)
Title of host publication32nd AIAA Fluid Dynamics Conference and Exhibit
StatePublished - 2002
Externally publishedYes
Event32nd AIAA Fluid Dynamics Conference and Exhibit 2002 - St. Louis, MO, United States
Duration: Jun 24 2002Jun 26 2002

Other

Other32nd AIAA Fluid Dynamics Conference and Exhibit 2002
CountryUnited States
CitySt. Louis, MO
Period6/24/026/26/02

Fingerprint

Reynolds number
Large eddy simulation
Navier Stokes equations
Turbulent flow
Tensors
Turbulence
Decomposition

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Aerospace Engineering

Cite this

Burton, G. C., Dahm, W., Dowling, D. R., & Powell, K. G. (2002). High reynolds-number assessment of a multifractal subgrid-scale model. In 32nd AIAA Fluid Dynamics Conference and Exhibit

High reynolds-number assessment of a multifractal subgrid-scale model. / Burton, Gregory C.; Dahm, Werner; Dowling, David R.; Powell, Kenneth G.

32nd AIAA Fluid Dynamics Conference and Exhibit. 2002.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Burton, GC, Dahm, W, Dowling, DR & Powell, KG 2002, High reynolds-number assessment of a multifractal subgrid-scale model. in 32nd AIAA Fluid Dynamics Conference and Exhibit. 32nd AIAA Fluid Dynamics Conference and Exhibit 2002, St. Louis, MO, United States, 6/24/02.
Burton GC, Dahm W, Dowling DR, Powell KG. High reynolds-number assessment of a multifractal subgrid-scale model. In 32nd AIAA Fluid Dynamics Conference and Exhibit. 2002
Burton, Gregory C. ; Dahm, Werner ; Dowling, David R. ; Powell, Kenneth G. / High reynolds-number assessment of a multifractal subgrid-scale model. 32nd AIAA Fluid Dynamics Conference and Exhibit. 2002.
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