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The computation of turbulent flow through stationary and rotating U‐bends with rib‐roughened surfaces
Author(s) -
Iacovides H.
Publication year - 1999
Publication title -
international journal for numerical methods in fluids
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 112
eISSN - 1097-0363
pISSN - 0271-2091
DOI - 10.1002/(sici)1097-0363(19990415)29:7<865::aid-fld821>3.0.co;2-m
Subject(s) - turbulence , curvature , reynolds number , mechanics , computation , geometry , secondary flow , duct (anatomy) , discretization , flow (mathematics) , mathematics , rotation (mathematics) , physics , mathematical analysis , anatomy , medicine , algorithm
This study focuses on the numerical computation of turbulent flow through stationary and rotating U‐ducts of square cross‐section, with rib‐roughened inner and outer walls along the straight sections. Square‐sectioned ribs, normal to the flow direction are employed in a staggered arrangement. The rib height‐to‐diameter ratio is 0.1 and the rib pitch‐to‐rib height ratio is 10. The bend curvature ratio ( R c / D ) is 0.65 and the flow Reynolds number is 100 000. The duct rotates about an axis parallel to that of curvature, at a rotation number ( Ro ≡±0.2). The preliminary computations presented suggest that grid requirements can be significantly reduced, through a combination of body fitted grids and high‐order convective discretisation schemes in all transport equations. The presence of regions of flow separation, necessitates the use of low Re second‐moment closures. Flows through negatively rotating U‐bends are found to be especially challenging to turbulence models. Copyright © 1999 John Wiley & Sons, Ltd.