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Evaluation of different k-omega and k-epsilon turbulence models in a new curvilinear formulation

Darbandi, M ; Sharif University of Technology | 2005

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  1. Type of Document: Article
  2. DOI: 10.2514/6.2005-5101
  3. Publisher: American Institute of Aeronautics and Astronautics Inc , 2005
  4. Abstract:
  5. Despite significant progress in unstructured grid generation and employment, the robust employment of body-conforming coordinate systems promotes the workers to consider it as a major alternative to treat relatively complex flow fields in irregular geometries. Contrary to the laminar flow treatment, there are many ambiguities around treating turbulent flow on body-fitted coordinate system. The ambiguities are mainly originated from the curvature on the boundaries. Considering the past taken efforts in improving the results of treating turbulent flow on curvilinear coordinate system, we have extended a new formulation on body-fitted coordinate system using physical covariant velocities as the dependent variables in our algorithm. The chosen numerical method is finite volume. To suppress non- physical solution on non-orthogonal grids, the advantages of staggered grid employment are utilized. To evaluate the performance of the newly developed formulation, we solve turbulent flow in complex geometries using different k-omega and k-epsilon turbulence models and compare their results with each other. The comparison indicates that the current formulation performs well using different turbulence models. In some cases, the results of a turbulence model show extra-ordinary advantages comparing with its employment in the other curvilinear coordinate formulations. © 2005 by Prof. M. Darbandi
  6. Keywords:
  7. Computational fluid dynamics ; Employment ; Laminar flow ; Numerical methods ; Turbulent flow ; Co-ordinate system ; Complex flow field ; Complex geometries ; Curvilinear coordinate ; Curvilinear coordinate systems ; Dependent variables ; Irregular geometries ; K-epsilon turbulence model ; Turbulence models
  8. Source: 17th AIAA Computational Fluid Dynamics Conference, Toronto, ON, 6 June 2005 through 9 June 2005 ; 2005 ; 9781624100536 (ISBN)
  9. URL: https://arc.aiaa.org/doi/10.2514/6.2005-5101