Comparison of k-ε models in predicting heat transfer and skin friction under high free stream turbulence

Ganesh R. Iyer, Savash Yavuzkurt

Research output: Contribution to journalConference article

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Abstract

Calculations of the effects of high free stream turbulence (FST) on heat transfer and skin friction in a flat plate turbulent boundary layer using different k-ε models (Launder-Sharma, K-Y Chien, Lam-Bremhorst and Jones-Launder) are presented. This study was carried out in order to investigate the prediction capabilities of these models under high FST conditions. In doing so, TEXSTAN, a partial differential equation solver which is based on the ideas of Patankar and Spalding and solves steady-flow boundary layer equations, was used. Firstly, these models were compared as to how they predicted very low FST (≤ 1% turbulence intensity) cases. These baseline cases were tested by comparing predictions with both experimental data and empirical correlations. Then, these models were used in order to determine the effect of high FST (>5% turbulence intensity) on heat transfer and skin friction and compared with experimental data. Predictions for heat transfer and skin friction coefficient for all the turbulence intensities tested by all the models agreed well (within 1-8%) with experimental data. However, all these models predicted poorly the dissipation of turbulent kinetic energy (TKE) in the free stream and TKE profiles. Physical reasoning as to why the aforementioned models differ in their predictions and the probable cause of poor prediction of free-stream TKE and TKE profiles are given.

Original languageEnglish (US)
Pages (from-to)8
Number of pages1
JournalAmerican Society of Mechanical Engineers (Paper)
StatePublished - Jan 1 1996
EventProceedings of the 1996 International Gas Turbine and Aeroengine Congress & Exhibition - Burmingham, UK
Duration: Jun 10 1996Jun 13 1996

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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