dorsal/arxiv
View SchemaPassive scalar anisotropy in a heated turbulent wake: new observations and implications for LES
| Authors | Hyung Suk Kang, Charles Meneveau |
|---|---|
| Categories | |
| ArXiv ID | physics/0106014 |
| URL | https://arxiv.org/abs/physics/0106014 |
| DOI | 10.1017/S0022112001005225 |
Abstract
The effects of passive scalar anisotropy on subgrid-scale (SGS) physics and modeling for Large-Eddy Simulations are studied experimentally. Measurements are performed across a moderate Reynolds number wake flow generated by a heated cylinder, using an array of four X-wire and four cold-wire probes. By varying the separation distance among probes in the array, we obtain filtered and subgrid quantities at three different filter sizes. We compute several terms that comprise the subgrid dissipation tensor of kinetic energy and scalar-variance and test for isotropic behavior, as a function of filter scale. We find that whereas the kinetic energy dissipation tensor tends towards isotropy at small scales, the SGS scalar-variance dissipation remains anisotropic independent of filter scale. The eddy-diffusion model predicts isotropic behavior, whereas the nonlinear (or tensor eddy diffusivity) model reproduces the correct trends, but overestimates the level of scalar dissipation anisotropy. These results provide some support for so-called mixed models but raise new questions about the causes of the observed anisotropy.
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"date_created": "2026-03-02T18:00:36.284000Z",
"date_modified": "2026-03-02T18:00:36.284000Z",
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"abstract": "The effects of passive scalar anisotropy on subgrid-scale (SGS) physics and\nmodeling for Large-Eddy Simulations are studied experimentally. Measurements\nare performed across a moderate Reynolds number wake flow generated by a heated\ncylinder, using an array of four X-wire and four cold-wire probes. By varying\nthe separation distance among probes in the array, we obtain filtered and\nsubgrid quantities at three different filter sizes. We compute several terms\nthat comprise the subgrid dissipation tensor of kinetic energy and\nscalar-variance and test for isotropic behavior, as a function of filter scale.\nWe find that whereas the kinetic energy dissipation tensor tends towards\nisotropy at small scales, the SGS scalar-variance dissipation remains\nanisotropic independent of filter scale. The eddy-diffusion model predicts\nisotropic behavior, whereas the nonlinear (or tensor eddy diffusivity) model\nreproduces the correct trends, but overestimates the level of scalar\ndissipation anisotropy. These results provide some support for so-called mixed\nmodels but raise new questions about the causes of the observed anisotropy.",
"arxiv_id": "physics/0106014",
"authors": [
"Hyung Suk Kang",
"Charles Meneveau"
],
"categories": [
"physics.flu-dyn"
],
"doi": "10.1017/S0022112001005225",
"title": "Passive scalar anisotropy in a heated turbulent wake: new observations and implications for LES",
"url": "https://arxiv.org/abs/physics/0106014"
},
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