Computational studies of near-wall behaviors of low-reynolds-number reynolds-stress models

Sergey N. Yakovenko, Keh-Chin Chang

Research output: Contribution to journalArticle

Abstract

The results obtained from a priori channel-flow tests show that the dissipation terms of some tested low-Reynoldsnumber models possess correct near-wall behaviors, whereas those obtained from a posteriori full computations by the same tested models do not. Such a contradiction is clarified comparing the behaviors extracted from exact analysis and particular models. Solutions of approximate near-wall equations show that the models produce overprediction in the viscous sublayer due to lower orders of leading turbulent-stress terms than in conventional expansions depending on a wall-normal coordinate. The modifications of dissipation-tensor and pressure-containing term approximations using a new geometry-independent "near-wall" tensor are proposed. This corrects the near-wall behaviors for the lowest-order Reynolds-stress expansion terms and improves prediction accuracy, particularly in the secondary recirculation zone of a turbulent flow behind a backward-facing step.

Original languageEnglish
Pages (from-to)279-296
Number of pages18
JournalAIAA journal
Volume57
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

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Reynolds number
Tensors
Channel flow
Turbulent flow
Geometry

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering

Cite this

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abstract = "The results obtained from a priori channel-flow tests show that the dissipation terms of some tested low-Reynoldsnumber models possess correct near-wall behaviors, whereas those obtained from a posteriori full computations by the same tested models do not. Such a contradiction is clarified comparing the behaviors extracted from exact analysis and particular models. Solutions of approximate near-wall equations show that the models produce overprediction in the viscous sublayer due to lower orders of leading turbulent-stress terms than in conventional expansions depending on a wall-normal coordinate. The modifications of dissipation-tensor and pressure-containing term approximations using a new geometry-independent {"}near-wall{"} tensor are proposed. This corrects the near-wall behaviors for the lowest-order Reynolds-stress expansion terms and improves prediction accuracy, particularly in the secondary recirculation zone of a turbulent flow behind a backward-facing step.",
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Computational studies of near-wall behaviors of low-reynolds-number reynolds-stress models. / Yakovenko, Sergey N.; Chang, Keh-Chin.

In: AIAA journal, Vol. 57, No. 1, 01.01.2019, p. 279-296.

Research output: Contribution to journalArticle

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