Recent Progress In A Hybrid-Grid CFD Solver For Turbomachinery Flows
Becker, Kai and Heitkamp, Kathrin and Kügeler, Edmund (2010) Recent Progress In A Hybrid-Grid CFD Solver For Turbomachinery Flows. In: Proceedings Fifth European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010. V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010, 14.-17. Juni 2010, Lisabon, Portugal. ISBN 978-989-96778-1-4.
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In recent years, further developments in the computer technology have led to advanced CFD codes being able to analyze complex three-dimensional flow behavior of turbo-machines. At present, most components in regular shape can be meshed with high-quality structured grids. However, the generation of structured grids is very difficult for some parts or areas, such as casing treatments or coolant channels, even if multi-block topologies are applied. In these cases, unstructured grids have to be introduced. Therefore, a hybrid structured/unstructured solver should be favored supporting both grid topologies in the same modeling. This paper presents recent progress in the development of the hybrid CFD solver with regard to the transition modeling. In low pressure turbines, laminar boundary layers are usually encountered due to the prevalent low Reynolds numbers. On the one hand, they produce fewer losses in comparison with turbulent boundary layers. On the other hand, they are more sensitive to flow separation leading to higher overall losses. Therefore, appropriate transition models have to be included in the CFD solver to be able to predict the overall losses quantitatively. The CFD code is now able to reproduce transport phenomena and the transitional effects regardless of the used grid topology. To validate and demonstrate the efficiency of the advancements, two test cases are introduced, a three-dimensional planar turbine cascade and two-dimensional turbine profile for unsteady analysis.
|Document Type:||Conference or Workshop Item (Speech, Paper)|
|Title:||Recent Progress In A Hybrid-Grid CFD Solver For Turbomachinery Flows|
|Journal or Publication Title:||Proceedings Fifth European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010|
|In ISI Web of Science:||No|
|Keywords:||Turbomaschinen, hybride Vernetzung, Transitionsmodell, zonales Interface|
|Event Title:||V European Conference on Computational Fluid Dynamics ECCOMAS CFD 2010|
|Event Location:||Lisabon, Portugal|
|Event Type:||international Conference|
|Event Dates:||14.-17. Juni 2010|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L ER - Engine Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L ER - Engine Research|
|DLR - Research theme (Project):||L - Virtual Engine and Validation Methods|
|Institutes and Institutions:||Institute of Propulsion Technology > Numerical Methodes|
|Deposited By:||Kathrin Heitkamp|
|Deposited On:||15 Feb 2011 14:10|
|Last Modified:||15 Feb 2011 14:10|
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