Expanding the limits of “equilibrium” second-moment turbulence closures |
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Institution: | a Faculty of Applied Physics, Delft University of Technology, Lorentzweg 1, 2628 CJ, Delft, The Netherlands b Lehrstuhl für Strömungsmechanik, University of Erlangen, Cauerstr. 4, 91058, Erlangen, Germany |
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Abstract: | The paper discusses possibilities for refinements of conventional “equilibrium” second-moment turbulence closure models, aimed at improving model performances in predicting turbulent flows of greater complexity. In focus are the invariant modelling of the low-Re-number and wall proximity effects, as well as extra strain-rates and control of the turbulence length-scale. In addition to satisfying most of the basic physical constraints, the main criterion for model validation was the quality of reproduction of flow and turbulence details, particularly, in the vicinity of a solid wall, in a broad variety of non-equilibrium flows featured by different phenomena. It is demonstrated that the new model, which includes several new modifications, but also some proposed in the past, can satisfactorily reproduce a range of attached and separating flows with strong time- or space-variations or abrupt changes of boundary conditions. Cases considered cover a wide range of Re-numbers involving in some cases also the laminar-to-turbulent or reverse transition. |
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