Numerical Analysis of Turbulent Flow Separation in a Rectangular Duct with Sharp 180-Degree Turn
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Accession number;06A0254190
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| Title;Numerical Analysis of Turbulent Flow Separation in a Rectangular Duct with Sharp 180-Degree Turn |
| Author;
SUGIYAMA HITOSHI
(Utsunomiya Univ., Graduate School of Engineering, JPN)
MUKAI HIDEAKI
(Dome Co., Ltd.)
HITOMI DAISUKE
(Utsunomiya Univ., Graduate School of Engineering, JPN)
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Journal Title;Transactions of the Atomic Energy Society of Japan
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Journal Code:L4596A
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ISSN:1347-2879
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VOL.5;NO.1;PAGE.1-13(2006)
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| Figure&Table&Reference;FIG.13, REF.17 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;Numerical analysis has been performed for three-dimensional developing turbulent flow in a rectangular duct with sharp 180-degree turn by using an algebraic Reynolds stress model. It is interesting point whether the present method can correctly predict the flow separation in rectangular duct, or not. In the numerical calculation, wall function method is modified by applying log law velocity used for roughened wall to separated flow region instead of usual log law velocity for smooth wall, because flow separation works as flow resistance. Calculated results are compared with the experimental data in order to examine the validity of the modified wall function method and an algebraic Reynolds stress model. As a result of this calculation, it was found that the present method with modified wall function could predict the reattachment location of flow separation more correctly than the usual wall function method. Besides, the present method could reproduce the streamwise velocity and the secondary flow pattern of the experiment except for cross section located in downstream of flow separation. Characteristic features of normal stresses are predicted qualitatively but the presented method has tendency to underestimate the experimental results. As for the modified wall function, calculated results suggest that changing log law velocity in the separation region is effective way to predict the flow separation accurately. (author abst.) |
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