Modelling two- and three-dimensional separation from curved surfaces with anisotropy-resolving turbulence closures
The ability of non-linear eddy-viscosity and second-moment models to predict separation from two- and three-dimensional curved surfaces is examined on the basis of computations for two flows that are geometrically akin: one separating from periodically-spaced, two-dimensional `hills' in a plane...
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| Veröffentlicht in: | International journal of heat and fluid flow 2004-06, Vol.25 (3), p.499-512 |
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| container_title | International journal of heat and fluid flow |
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| creator | Wang, C. Jang, Y.J. Leschziner, M.A. |
| description | The ability of non-linear eddy-viscosity and second-moment models to predict separation from two- and three-dimensional curved surfaces is examined on the basis of computations for two flows that are geometrically akin: one separating from periodically-spaced, two-dimensional `hills' in a plane channel, and the other from a three-dimensional hill in a duct. One major objective is to examine whether the predictive performance in 3-d (three-dimensional) conditions relates to that in 2-d (two-dimensional) flow. In the former, the separation pattern is far more complicated, being characterised by multiple vortical structures associated with `open' separation. The predicted separation behaviour in the 2-d flow differs significantly from model to model, with only one non-linear model among those examined performing well, this variant formulated to adhere to the two-component wall limit. In 3-d separation, none of the models gives a credible representation of the complex multi-vortical separation pattern. |
| doi_str_mv | 10.1016/j.ijheatfluidflow.2004.02.009 |
| format | Article |
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One major objective is to examine whether the predictive performance in 3-d (three-dimensional) conditions relates to that in 2-d (two-dimensional) flow. In the former, the separation pattern is far more complicated, being characterised by multiple vortical structures associated with `open' separation. The predicted separation behaviour in the 2-d flow differs significantly from model to model, with only one non-linear model among those examined performing well, this variant formulated to adhere to the two-component wall limit. 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One major objective is to examine whether the predictive performance in 3-d (three-dimensional) conditions relates to that in 2-d (two-dimensional) flow. In the former, the separation pattern is far more complicated, being characterised by multiple vortical structures associated with `open' separation. The predicted separation behaviour in the 2-d flow differs significantly from model to model, with only one non-linear model among those examined performing well, this variant formulated to adhere to the two-component wall limit. 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One major objective is to examine whether the predictive performance in 3-d (three-dimensional) conditions relates to that in 2-d (two-dimensional) flow. In the former, the separation pattern is far more complicated, being characterised by multiple vortical structures associated with `open' separation. The predicted separation behaviour in the 2-d flow differs significantly from model to model, with only one non-linear model among those examined performing well, this variant formulated to adhere to the two-component wall limit. In 3-d separation, none of the models gives a credible representation of the complex multi-vortical separation pattern.</abstract><cop>New York, NY</cop><pub>Elsevier Inc</pub><doi>10.1016/j.ijheatfluidflow.2004.02.009</doi><tpages>14</tpages></addata></record> |
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| identifier | ISSN: 0142-727X |
| ispartof | International journal of heat and fluid flow, 2004-06, Vol.25 (3), p.499-512 |
| issn | 0142-727X 1879-2278 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Curved surfaces Exact sciences and technology Flows in ducts, channels, nozzles, and conduits Fluid dynamics Fundamental areas of phenomenology (including applications) Non-linear eddy-viscosity models Physics Reynolds-stress models Separation Turbulence modelling Turbulence simulation and modeling Turbulent flows, convection, and heat transfer |
| title | Modelling two- and three-dimensional separation from curved surfaces with anisotropy-resolving turbulence closures |
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