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RISS 인기검색어
- 검색키워드
- 저자 : Klaus Bremhorst (검색결과 1 건)
- 무료
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Comparison of DNS and Reynolds stress modelling of flow around a rotating cylinder
Klaus Bremhorst,Matthew Brennan2,양경수 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
The low Reynolds number stress-omega model is applied to flow associated with a rotating cylinder operating in a larger, stationarycylinder. The working fluid fills the gap between the cylinders. Direct numerical simulation data are used to test the predictions by thisturbulence model. Previous work has shown that simpler models are unable to predict with reasonable accuracy the wall shear stressexperienced by the rotating cylinder. The present study with a more complex turbulence model shows that the wall shear stress on therotating cylinder is underestimated significantly. Examination of turbulence velocity fluctuation intensity distributions points to underpredictionof the streamwise turbulence level and excessive values of the wall normal turbulence level. Results are given for no shear anda wall shear at the outer cylinder surface but no effect on the inner cylinder statistics was found. An examination of the Reynolds stressanisotropy tensor components highlights a significant deficiency in this parameter which is an essential component of the pressure-strainmodelling of Reynolds stress models. The most significant aspect is a rapid decrease of the streamwise component of the Reynolds stressanisotropy tensor relative to the direct numerical simulation results and values which are too low for the other two components.
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